Dr Andreas Koch

Reader

Another look at the size of the low-surface brightness galaxy VCC 1661 in the Virgo Cluster
Koch, A., Black, C.S., Rich, R.M., Longstaff, F.A., Collins, M.L.M., Janz, J. 05/2017 In: Astronomical Notes / Astronomische Nachrichten. 338, 4, p. 503-509. 7 p.
Journal article

Galactic Pal-eontology: abundance analysis of the disrupted globular cluster Palomar 5
Koch, A., Cote, P. 05/2017 In: Astronomy and Astrophysics. 601, 9 p.
Journal article

Insights into the chemical composition of the metal-poor Milky Way halo globular cluster NGC 6426
Hanke, M., Koch, A., Hansen, C., McWilliam, A. 6/03/2017 In: Astronomy and Astrophysics. 599, 15 p.
Journal article

Evidence for multiple populations in intermediate age cluster Lindsay 1 in the SMC
Hollyhead, K., Kacharov, N., Lardo, C., Bastian, N., Hilker, M., Rejkuba, M., Koch, A., Grebel, E., Georgiev, I. 11/02/2017 In: Monthly Notices of the Royal Astronomical Society. 465, 1, p. L39-L43. 5 p.
Journal article

Something borrowed, something blue: the nature of blue metal-poor stars inferred from their colours and chemical abundances
Hansen, C., Jofre, P., Koch, A., McWilliam, A., Sneden, C. 02/2017 In: Astronomy and Astrophysics. 598, 16 p.
Journal article

The Gaia ESO survey: calibration strategy
Pancino, E., Koch, A. 02/2017 In: Astronomy and Astrophysics. 598, 16 p.
Journal article

TOPoS: III. An ultra iron-poor CEMP multiple system
Caffau, E., Bonifacio, P., Spite, M., Spite, F., Monaco, L., Sbordone, L., Francois, P., Gallagher, A., Plez, B., Zaggia, S., Ludwig, H., Cayrel, R., Koch, A., Steffen, M., Salvadori, S., Klessen, R., Glover, S., Christlieb, N. 11/2016 In: Astronomy and Astrophysics. 595, 6 p.
Journal article

The Halos and Environments of Nearby Galaxies (HERON) Survey
Rich, R.M., Brosch, N., Bullock, J., Burkert, A., Collins, M.L.M., de Groot, L., Kennefick, J., Koch, A., Longstaff, F.A., Sales, L. 11/10/2016 In: IAUS 321, Outskirts of Galaxies.
Conference contribution

A new algorithm for optimizing the wavelength coverage for spectroscopic studies: Spectral Wavelength Optimization Code (swoc)
Ruchti, G.R., Feltzing, S., Lind, K., Caffau, E., Korn, A.J., Schnurr, O., Hansen, C.J., Koch, A., Sbordone, L., De jong, R.S. 11/09/2016 In: Monthly Notices of the Royal Astronomical Society. 461, 2, p. 2174-2191. 17 p.
Journal article

Chemical abundances in a high-velocity RR Lyrae star near the bulge
Hansen, C.J., Rich, R.M., Koch, A., Xu, S., Kunder, A., Ludwig, H. 1/06/2016 In: Astronomy and Astrophysics. 590, 9 p.
Journal article

Before the bar: kinematic detection of a spheroidal metal-poor bulge component
Kunder, A., Rich, R.M., Koch, A., Storm, J., Nataf, D.M., Propris, R.D., Walker, A., Bono, G., Johnson, C.I., Shen, J., Li, Z. 18/04/2016 In: Astrophysical Journal Letters. 821, 2, 6 p.
Journal article

Metal-poor stars towards the Galactic bulge: a population potpourri
Koch, A., McWilliam, A., Preston, G.W., Thompson, I.P. 1/03/2016 In: Astronomy and Astrophysics. 587, 15 p.
Journal article

Triangulum II: a very metal-poor and dynamically hot stellar system
Martin, N.F., Ibata, R.A., Collins, M.L.M., Rich, R.M., Bell, E.F., Ferguson, A.M.N., Laevens, B.P.M., Rix, H., Chapman, S.C., Koch, A. 5/02/2016 In: The Astrophysical Journal. 818, 1, 7 p.
Journal article

Evidence for a chemical enrichment coupling of globular clusters and field stars in the Fornax dSph
Hendricks, B., Boeche, C., Johnson, C.I., Frank, M.J., Koch, A., Mateo, M., Bailey III, J.I. 01/2016 In: Astronomy and Astrophysics. 585, 17 p.
Journal article

Major mergers with small galaxies: the discovery of a Magellanic-type galaxy at z=0.12
Koch, A., Frank, M.J., Pasquali, A., Rich, R.M., Rabitz, A. 15/12/2015 In: The Astrophysical Journal. 815, 2, 10 p.
Journal article

Stellar science from a blue wavelength range: a possible design for the blue arm of 4MOST
Hansen, C.J., Ludwig, H., Seifert, W., Koch, A., Xu, W., Caffau, E., Christlieb, N., Korn, A.J., Lind, K., Sbordone, L., Ruchti, G.R., Feltzing, S., De jong, R.S., Barden, S., Schnurr, O. 10/09/2015 In: Astronomical Notes / Astronomische Nachrichten. 336, 7, p. 665-676. 12 p.
Journal article

Strömgren uvby photometry of the peculiar globular cluster NGC 2419
Frank, M.J., Koch, A., Feltzing, S., Kacharov, N., Wilkinson, M.I., Irwin, M. 09/2015 In: Astronomy and Astrophysics. 581, 15 p.
Journal article

A high-velocity bulge RR Lyrae variable on a halo-like orbit
Kunder, A., Rich, R.M., Hawkins, K., Poleski, R., Storm, J., Johnson, C.I., Shen, J., Li, Z., Cordero, M.J., Nataf, D.M., Bono, G., Walker, A.R., Koch, A., Propris, R.D., Udalski, A., Szymanski, M.K., Soszynski, I., Pietrzynski, G., Ulaczyk, K., Wyrzykowski, L., Pietrukowicz, P., Skowron, J., Kozłowski, S., Mróz, P. 16/07/2015 In: Astrophysical Journal Letters. 808, 1, 6 p.
Journal article

A detection of gas associated with the M31 Stellar Stream
Koch, A., Danforth, C.W., Rich, R.M., Ibata, R.A., Keeney, B.A. 9/07/2015 In: The Astrophysical Journal. 807, 2, 9 p.
Journal article

TOPoS: on the bimodality of carbon abundance in CEMP stars Implications on the early chemical evolution of galaxies
Bonifacio, P., Caffau, E., Spite, M., Limongi, M., Chieffi, A., Klessen, R.S., Francois, P., Molaro, P., Ludwig, H., Zaggia, S., Spite, F., Plez, B., Cayrel, R., Christlieb, N., Clark, P.C., Glover, S.C.O., Hammer, F., Koch, A., Monaco, L., Sbordone, L., Steffen, M. 07/2015 In: Astronomy and Astrophysics. 579, 20 p.
Journal article

Selecting Sagittarius: identification and chemical characterization of the Sagittarius stream
Hyde, E.A., Keller, S., Zucker, D.B., Ibata, R., Siebert, A., Lewis, G.F., Penarrubia, J., Irwin, M., Gilmore, G., Lane, R.R., Koch, A., Conn, A.R., Diakogiannis, F.I., Martell, S. 2/06/2015 In: The Astrophysical Journal. 805, 2, 13 p.
Journal article

Galactic evolution of sulphur as traced by globular clusters
Kacharov, N., Koch, A., Caffau, E., Sbordone, L. 24/04/2015 In: Astronomy and Astrophysics. 577, 9 p.
Journal article

The Gaia-ESO Survey: detailed abundances in the metal-poor globular cluster NGC 4372
Roman, I.S., Muñoz, C., Geisler, D., Villanova, S., Kacharov, N., Koch, A., Carraro, G., Tautvaišiene, G., Vallenari, A., Alfaro, E.J., Bensby, T., Flaccomio, E., Francois, P., Korn, A.J., Pancino, E., Recio-Blanco, A., Smiljanic, R., Bergemann, M., Costado, M.T., Damiani, F., Heiter, U., Hourihane, A., Jofré, P., Lardo, C., Laverny, P.d., Masseron, T., Morbidelli, L., Sbordone, L., Sousa, S.G., Worley, C.C., Zaggia, S. 14/04/2015 In: Astronomy and Astrophysics. 579, 14 p.
Journal article

An inefficient dwarf: Chemical abundances and the evolution of the Ursa Minor dwarf spheroidal galaxy
Ural, U., Cescutti, G., Koch, A., Kleyna, J., Feltzing, S., Wilkinson, M.I. 19/03/2015 In: Monthly Notices of the Royal Astronomical Society. 449, 1, p. 761-770. 10 p.
Journal article

Galaxy evolution through resolved stellar populations in the nearby Centaurus A group
Crnojevic, D., Grebel, E., Ferguson, A.M.N., Koch, A., Rejkuba, M., Da Costa, G., Jerjen, H., Irwin, M.J., Bernard, E.J., Arimoto, N., Jablonka, P., Kobayashi, C. 2015 In: Memorie della Societa Astronomica Italiana. 86, p. 302-305. 4 p.
Journal article

Insights from the outskirts: chemical and dynamical properties in the outer parts of the Fornax dwarf spheroidal galaxy
Hendricks, B., Koch, A., Walker, M., Johnson, C.I., Penarrubia, J., Gilmore, G. 12/2014 In: Astronomy and Astrophysics. 572, 19 p.
Journal article

A chemical confirmation of the faint Boötes II dwarf Spheroidal Galaxy
Koch, A., Rich, R.M. 25/09/2014 In: The Astrophysical Journal. 794, 1, 9 p.
Journal article

Light, Alpha, and Fe-peak element abundances in the Galactic bulge
Johnson, C.I., Rich, R.M., Kobayashi, C., Kunder, A., Koch, A. 9/09/2014 In: The Astronomical Journal. 148, 4, 32 p.
Journal article

4MOST: 4-metre Multi-Object Spectroscopic Telescope
4MOST Consortium 24/07/2014 In: Proceedings of SPIE. 9147
Journal article

A study of rotating globular clusters: the case of the old, metal-poor globular cluster NGC 4372
Kacharov, N., Bianchini, P., Koch, A., Frank, M.J., Martin, N.F., van de Ven, G., Puzia, T.H., McDonald, I., Johnson, C.I., Zijlstra, A.A. 11/07/2014 In: Astronomy and Astrophysics. 567, 12 p.
Journal article

The chemical composition of a regular halo globular cluster: NGC 5897
Koch, A., McWilliam, A. 05/2014 In: Astronomy and Astrophysics. 565, 13 p.
Journal article

The metal-poor knee in the Fornax dwarf spheroidal galaxy
Hendricks, B., Koch, A., Lanfranchi, G.A., Boeche, C., Walker, M., Johnson, C.I., Penarrubia, J., Gilmore, G. 1/04/2014 In: The Astrophysical Journal. 785, 2, 9 p.
Journal article

The Be-test in the Li-rich star #1657 of NGC 6397: evidence for Li-flash in RGB stars?
Pasquini, L., Koch, A., Smiljanic, R., Bonifacio, P., Modigliani, A. 03/2014 In: Astronomy and Astrophysics. 563, 5 p.
Journal article

The masses of local group dwarf spheroidal galaxies: the death of the universal mass profile
Collins, M.L.M., Chapman, S.C., Rich, R.M., Ibata, R.A., Martin, N.F., Irwin, M.J., Bate, N.F., Lewis, G.F., Peñarrubia, J., Arimoto, N., Casey, C.M., Ferguson, A.M.N., Koch, A., McConnachie, A.W., Tanvir, N. 6/02/2014 In: The Astrophysical Journal. 783, 1, 14 p.
Journal article

Blanco DECam Bulge Survey (BDBS): current status and progress
Koch, A. 2014
Meeting abstract

Formation histories of galactic halos via chemical and dynamical analyses of near-by stellar systems: Habilitation Thesis
Koch, A. 2014 University of Heidelberg.
Doctoral Thesis

Searching for stellar sub-structure in the Galactic bulge
Koch, A. 2014
Meeting abstract

The Blanco DECam Bulge Survey (BDBS): status and early results
Koch, A. 2014
Meeting abstract

A spectroscopic binary in the Hercules dwarf spheroidal galaxy
Koch, A., Hansen, T., Feltzing, S., Wilkinson, M.I. 13/12/2013 In: The Astrophysical Journal. 780, 1, 6 p.
Journal article

TOPoS: I. Survey design and analysis of the first sample
Caffau, E., Bonifacio, P., Sbordone, L., Francois, P., Monaco, L., Spite, M., Plez, B., Cayrel, R., Christlieb, N., Clark, P., Glover, S., Klessen, R., Koch, A., Ludwig, H.-., Spite, F., Steffen, M., Zaggia, S. 6/12/2013 In: Astronomy and Astrophysics. 560, 9 p.
Journal article

A comprehensive chemical abundance study of the outer halo globular cluster M 75
Kacharov, N., Koch, A., McWilliam, A. 10/06/2013 In: Astronomy and Astrophysics. 554, 15 p.
Journal article

Neutron-capture element deficiency of the Hercules dwarf spheroidal galaxy
Koch, A., Feltzing, S., Adén, D., Matteucci, F. 06/2013 In: Astronomy and Astrophysics. 554, 10 p.
Journal article

A kinematic study of the Andromeda dwarf spheroidal system
Collins, M.L.M., Chapman, S.C., Rich, R.M., Ibata, R.A., Martin, N.F., Irwin, M.J., Bate, N.F., Lewis, G.F., Peñarrubia, J., Arimoto, N., Casey, C.M., Ferguson, A.M.N., Koch, A., McConnachie, A.W., Tanvir, N. 26/04/2013 In: The Astrophysical Journal. 768, 2, 36 p.
Journal article

Velocity and abundance precisions for future high-resolution spectroscopic surveys: a study for 4MOST
Caffau, E., Koch, A., Sbordone, L., Sartoretti, P., Hansen, C.J., Royer, F., Leclerc, N., Bonifacio, P., Christlieb, N., Ludwig, H.G., Grebel, E.K., Jong, R.S.d., Chiappini, C., Walcher, J., Mignot, S., Feltzing, S., Cohen, M., Minchev, I., Helmi, A., Piffl, T., Depagne, E., Schnurr, O. 1/03/2013 In: Astronomical Notes / Astronomische Nachrichten. 334, 3, p. 197-216. 20 p.
Journal article

Metallicity distribution functions, radial velocities, and alpha element abundances in three off-axis bulge fields
Johnson, C.I., Rich, R.M., Kobayashi, C., Kunder, A., Pilachowski, C.A., Koch, A., Propris, R.D. 27/02/2013 In: The Astrophysical Journal. 765, 2, 47 p.
Journal article

Population gradients and photometric metallicities in early- and transition-type dwarf galaxies: clues from the Sculptor group
Lianou, S., Grebel, E., Da Costa, G.S., Rejkuba, M., Jerjen, H., Koch, A. 17/01/2013 In: Astronomy and Astrophysics. 550, 21 p.
Journal article

A new, smaller size for the low-surface brightness galaxy VCC 1661 in the Virgo Cluster
Black, C., Koch, A., Rich, R.M., Longstaff, F., Collins, M., Lisker, T., Janz, J. 2013
Meeting abstract

An abundance study of the outer halo globular cluster M75
Kacharov, N., Koch, A. 2013
Meeting abstract

An intermediate-band photometric study of the “Globular Cluster” NGC 2419
Koch, A., Frank, M.J., Feltzing, S., Adén, D., Kacharov, N., Wilkinson, M.I. 2013
Meeting abstract

Selecting Sagittarius: a study of Sagittarius dwarf members throughout the Milky Way Galactic halo
Hyde, E.A., Zucker, D.B., Keller, S., Siebert, A., Ibata, R.A., Penarrubia, J., Martell, S., Lewis, G., Irwin, M., Koch, A. 2013
Meeting abstract

The local universe at 30 mag/sq. arcsec: extended stellar halos around near-by galaxies
Schaul, D., Rich, R., Black, C., Reitzel, D.B., Collins, M., Koch, A., Longstaff, F., Benson, A. 2013
Meeting abstract

Chemical abundances of metal-poor RR Lyrae stars in the Magellanic Clouds
Haschke, R., Grebel, E., Frebel, A., Duffau, S., Hansen, C.J., Koch, A. 16/08/2012 In: The Astronomical Journal. 144, 3, 17 p.
Journal article

Threshing in action: the tidal disruption of a dwarf galaxy by the Hydra I cluster
Koch, A., Burkert, A., Rich, R.M., Collins, M.L.M., Black, C.S., Hilker, M., Benson, A.J. 25/07/2012 In: Astrophysical Journal Letters. 755, 1, 7 p.
Journal article

Dwarf spheroidal galaxy kinematics and spiral galaxy scaling laws
Salucci, P., Wilkinson, M.I., Walker, M., Gilmore, G., Grebel, E., Koch, A., Martins, C.F., Wyse, F.G. 1/03/2012 In: Monthly Notices of the Royal Astronomical Society. 420, 3, p. 2034-2041. 8 p.
Journal article

A tidally distorted dwarf galaxy near NGC 4449
Rich, R.M., Collins, M.L.M., Black, C.M., Longstaff, F., Koch, A., Benson, A.J., Reitzel, D.B. 9/02/2012 In: Nature. 482, 7384, p. 192-194. 3 p.
Journal article

The Bulge Radial Velocity Assay (BRAVA): II. Complete sample and data release
Kunder, A., Koch, A., Rich, R.M., Propris, R.d., Howard, C.D., Stubbs, S.A., Johnson, C.I., Shen, J., Wang, Y., Robin, A.C., Kormendy, J., Soto, M., Frinchaboy, P., Reitzel, D.B., Zhao, H., Origlia, L. 6/02/2012 In: The Astronomical Journal. 143, 3, 14 p.
Journal article

4MOST: 4-metre Multi-Object Spetroscopic Telescope
4MOST Consortium 2012 In: Proceedings of SPIE. 8446
Journal article

4MOST: 4-meter Multi-Object Spectroscopic Telescope
4MOST Consortium 2012 In: EPJ Web of Conferences. 19, 3 p.
Journal article

A super-Li rich turnoff star in NGC 6397: the puzzle persists
Koch, A., Lind, K., Thompson, I.B., Rich, R. 2012
Meeting abstract

Precise abundance analysis of the outer halo globular cluster M 75
Kacharov, N., Koch, A. 2012 In: AIP Conference Proceedings. 1480, p. 385.
Journal article

Small-scale hero: massive-star enrichment in the Hercules dwarf spheroidal
Koch, A., Matteucci, F., Feltzing, S. 2012 In: AIP Conference Proceedings. 1480, p. 190.
Journal article

The Bulge Radial Velocity Assay (BRAVA): final results, a new high velocity star, and public data release
Rich, R., Kunder, A., Propris, R.d., Koch, A. 2012
Meeting abstract

The Gaia-ESO Public Spectroscopic Survey
Koch, A. 2012 In: The Messenger. 147, p. 25-31. 7 p.
Journal article

The chemical composition of RGB stars in off-axis bulge field
Johnson, C.I., Rich, R., Kunder, A., Propris, R.d., Kobayashi, C., Koch, A. 2012
Meeting abstract

The puzzling assembly of the Milky Way halo: contributions from dwarf Spheroidals and globular clusters
Koch, A., Lépine, S., Çalışkan, Ş. 2012 In: EPJ Web of Conferences. 19, 7 p.
Journal article

A first measurement of the proper motion of the Leo II dwarf spheroidal galaxy
Lépine, S., Koch, A., Rich, R.M., Kuijken, K. 24/10/2011 In: The Astrophysical Journal. 741, 2, 10 p.
Journal article

Sulphur in the metal poor globular cluster NGC 6397
Koch, A., Caffau, E. 10/2011 In: Astronomy and Astrophysics. 534, 6 p.
Journal article

Discovery of a super-Li-rich turnoff star in the metal-poor globular cluster NGC 6397
Koch, A., Lind, K., Rich, R.M. 23/08/2011 In: Astrophysical Journal Letters. 738, 2, 5 p.
Journal article

A differential chemical element analysis of the metal-poor globular cluster NGC 6397
Koch, A., McWilliam, A. 19/07/2011 In: The Astronomical Journal. 142, 2, 13 p.
Journal article

Spectroscopic versus photometric metallicities: Milky Way dwarf spheroidal companions as a test case
Lianou, S., Grebel, E., Koch, A. 5/07/2011 In: Astronomy and Astrophysics. 531, 17 p.
Journal article

The kinematic identification of a thick stellar disc in M31
Collins, M.L.M., Chapman, S.C., Ibata, R.A., Irwin, M.J., Rich, R.M., Ferguson, A.M.N., Lewis, G.F., Tanvir, N., Koch, A. 21/05/2011 In: Monthly Notices of the Royal Astronomical Society. 413, 3, p. 1548-1568. 21 p.
Journal article

Separating the conjoined red clump in the Galactic bulge: kinematics and abundances
Propris, R.D., Rich, R.M., Kunder, A., Johnson, C.I., Koch, A., Brough, S., Conselice, C.J., Gunawardhana, M., Palamara, D., Pimbblet, K., Wijesinghe, D. 25/04/2011 In: Astrophysical Journal Letters. 732, 2, 5 p.
Journal article

Dwarf galaxies beyond Our doorstep: the Centaurus Group
Crnojevic, D., Grebel, E.K., Cole, A.A., Koch, A., Rejkuba, M., Costa, G.D., Jerjen, H. 2011 In: EAS Publications Series. 48, p. 51-57. 7 p.
Journal article

Hermes and the Sagittarius dwarf: a low metallicity goldmine?
Hyde, E.A., Zucker, D.B., Irwin, M., Penarrubia, J., Koch, A. 2011
Conference paper

How unique is the Local Group?: A comparison to the nearby Centaurus A group
Crnojevic, D., Grebel, E., Ferguson, A.M.N., Cole, A.A., Koch, A., Rejkuba, M., Da Costa, G., Jerjen, H. 2011
Conference paper

M 81 group dSphs: metallicity distribution functions and gradients
Lianou, S., Grebel, E., Koch, A. 2011 In: EAS Publications Series. 48, p. 91-92. 2 p.
Journal article

The Bulge Radial Velocity Assay: new observations and results
Kunder, A., Propris, R.d., Rich, R., Koch, A. 2011
Meeting abstract

Was the progenitor of the Sagittarius Stream a disc galaxy?: Recent results & observations
Hyde, E.A., Zucker, D.B., Peñarrubia , J., Irwin, M., Lane, R., Lewis, G.F., Gilmore, G., Koch, A. 2011
Meeting abstract

Dwarf spheroidals in the M81 Group: metallicity distribution functions and population gradients
Lianou, S., Grebel, E., Koch, A. 19/10/2010 In: Astronomy and Astrophysics. 521, 15 p.
Journal article

A close look at the Centaurus A group of galaxies: I. Metallicity distribution functions and population gradients in early-type dwarfs
Crnojevic, D., Grebel, E., Koch, A. 07/2010 In: Astronomy and Astrophysics. 516, 17 p.
Journal article

Ages and luminosities of young SMC/LMC star clusters and the recent star formation history of the Clouds
Glatt, K., Grebel, E., Koch, A. 07/2010 In: Astronomy and Astrophysics. 517, 15 p.
Journal article

Chemical abundances for the outer halo cluster Pal 4 from co-added high-resolution spectroscopy
Koch, A., Côté, P. 07/2010 In: Astronomy and Astrophysics. 517, 15 p.
Journal article

A differential chemical abundance scale for the globular cluster M5
Koch, A., McWilliam, A. 22/04/2010 In: The Astronomical Journal. 139, 6, p. 2289-2299. 11 p.
Journal article

A statistical analysis of the late-type stellar content in the Andromeda Halo
Koch, A., Rich, R.M. 21/04/2010 In: The Astronomical Journal. 139, 6, p. 2279-2288. 10 p.
Journal article

Dark matter constraints from wide halo binary stars
Quinn, D.P., Wilkinson, M.I., Irwin, M.J., Marshall, J., Koch, A., Belokurov, V. 2010 In: ASP Conference Series. 435, p. 453-456. 4 p.
Journal article

Dwarf spheroidals in the M81 galaxy group
Lianou, S., Grebel, E.K., Koch, A. 2010 In: ASP Conference Series. 424, p. 242-243. 2 p.
Journal article

Striking agreement between galactic bulge kinematics from the BRAVA survey, and an N-body bar
Rich, R.M., Shen, J., Howard, C.D., Propris, R.d., Koch, A., Reitzel, D.B. 2010
Meeting abstract

Kinematic subpopulations in dwarf spheroidal galaxies
Ural, U., Wilkinson, M.I., Koch, A., Gilmore, G., Beers, T.C., Belokurov, V., Wyn Evans, N., Grebel, E., Vidrih, S., Zucker, D.B. 18/12/2009 In: Monthly Notices of the Royal Astronomical Society. 402, 2, p. 1357-1368. 12 p.
Journal article

A new low mass for the Hercules dSph: the end of a common mass scale for the dwarfs?
Adén, D., Wilkinson, M.I., Read, J.I., Feltzing, S., Koch, A., Gilmore, G.F., Grebel, E., Lundström, I. 4/11/2009 In: Astrophysical Journal Letters. 706, 1, p. L150-L154. 5 p.
Journal article

Evolution of dwarf galaxies in the Centaurus A group
Crnojevic, D., Grebel, E.K., Koch, A. 4/11/2009 In: Astronomical Notes / Astronomische Nachrichten. 330, 9-10, p. 1001-1003. 3 p.
Journal article

All quiet in the outer halo: chemical abundances in the globular cluster Pal 3
Koch, A., Côté, P., McWilliam, A. 11/2009 In: Astronomy and Astrophysics. 506, 2, p. 729-743. 15 p.
Journal article

Structural parameters of seven small magellanic cloud intermediate-age and old star clusters
Glatt, K., Grebel, E.K., Gallagher III, J.S., Nota, A., Sabbi, E., Sirianni, M., Clementini, G., Costa, G.D., Tosi, M., Harbeck, D., Koch, A., Kayser, A. 1/10/2009 In: The Astronomical Journal. 138, 5, p. 1403-1416. 14 p.
Journal article

A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: metallicity, velocities, and a clean list of RGB members
Adén, D., Feltzing, S., Koch, A., Wilkinson, M.I., Grebel, E.K., Lundström, I., Gilmore, G.F., Zucker, D.B., Belokurov, V., Evans, N.W., Faria, D. 27/08/2009 In: Astronomy and Astrophysics. 506, 3, p. 1147-1168. 22 p.
Journal article

Kinematics at the edge of the galactic bulge: evidence for cylindrical rotation
Howard, C.D., Rich, R.M., Clarkson, W., Mallery, R., Kormendy, J., Propris, R.d., Robin, A.C., Fux, R., Reitzel, D.B., Zhao, H., Kuijken, K., Koch, A. 24/08/2009 In: Astrophysical Journal Letters. 702, 2, p. L153-L157. 5 p.
Journal article

A constant dark matter halo surface density in galaxies
Donato, F., Gentile, G., Salucci, P., Martins, C.F., Wilkinson, M.I., Gilmore, G., Grebel, E., Koch, A., Wyse, R. 11/08/2009 In: Monthly Notices of the Royal Astronomical Society. 397, 3, p. 1169-1176. 8 p.
Journal article

Complexity in small-scale dwarf spheroidal galaxies
Koch, A., Adén, D., Grebel, E.K., Feltzing, S. 08/2009 In: Proceedings of the International Astronomical Union. 5, S265, p. 227-232. 6 p.
Journal article

On the reported death of the MACHO era
Quinn, D.P., Wilkinson, M.I., Irwin, M.J., Marshall, J., Koch, A., Belokurov, V. 29/04/2009 In: Monthly Notices of the Royal Astronomical Society: Letters. 396, 1, p. L11-L15. 5 p.
Journal article

A spectroscopic confirmation of the Bootes II dwarf spheroidal
Koch, A., Wilkinson, M.I., Kleyna, J., Irwin, M., Zucker, D.B., Belokurov, V., Gilmore, G., Fellhauer, M., Wyn Evans, N. 1/01/2009 In: The Astrophysical Journal. 690, 1, p. 453-462. 10 p.
Journal article

Complexity in small-scale dwarf spheroidal galaxies: Ludwig Biermann Award Lecture
Koch, A. 2009 In: Reviews in Modern Astronomy. Wiley p. 39-69. 31 p.
Paper

Dwarf spheroidal galaxies in the M81 group of galaxies
Lianou, S., Grebel, E.K., Koch, A. 2009 In: Astronomical Notes / Astronomische Nachrichten. 330, 9-10, p. 995-997. 3 p.
Journal article

Early-type dwarf galaxies in the M81 group
Lianou, S., Grebel, E.K., Koch, A. 2009 In: Stellar Populations. Cambridge University Press p. 115-118. 4 p.
Paper

The age-metallicity relation of the SMC
Kayser, A., Grebel, E.K., Harbeck, D., Cole, A.A., Koch, A., Gallagher III, J.S., Da Costa, G. 2009 In: Globular Clusters. Springer p. 157-160. 4 p. ISBN: 9783540769606. Electronic ISBN: 9783540769613.
Chapter

Young star clusters in the SMC
Glatt, K., Grebel, E.K., Koch, A. 2009 In: Globular Clusters. Springer p. 119-120. 2 p. ISBN: 9783540769606. Electronic ISBN: 9783540769613.
Chapter

Kinematic and chemical constraints on the formation of M31's inner and outer halo
Koch, A., Rich, R.M., Reitzel, D.B., Martin, N.F., Ibata, R.A., Chapman, S.C., Majewski, S.R., Mori, M., Loh, Y., Ostheimer, J.C., Tanaka, M. 20/12/2008 In: The Astrophysical Journal. 689, 2, p. 958-982. 25 p.
Journal article

The Bulge Radial Velocity Assay (BRAVA): I. Sample selection and a rotation curve
Howard, C.D., Rich, R.M., Reitzel, D.B., Koch, A., Propris, R.d., Zhao, H. 1/12/2008 In: The Astrophysical Journal. 688, 2, p. 1060-1077. 18 p.
Journal article

The kinematic footprints of five stellar streams in Andromeda's halo
Chapman, S.C., Ibata, R.A., Irwin, M., Koch, A., Letarte, B., Martin, N., Collins, M., Lewis, G.F., McConnachie, A., Peñarrubia , J., Rich, R.M., Trethewey, D., Ferguson, A., Huxor, A., Tanvir, N. 11/11/2008 In: Monthly Notices of the Royal Astronomical Society. 390, 4, p. 1437-1452. 16 p.
Journal article

The highly unusual chemical composition of the Hercules dwarf spheroidal galaxy
Koch, A., McWilliam, A., Grebel, E.K., Zucker, D.B., Belokurov, V. 3/11/2008 In: Astrophysical Journal Letters. 688, 1, p. L13-L16. 4 p.
Journal article

The extended star formation history of the Andromeda spheroid at 35 kpc on the minor axis
Brown, T.M., Beaton, R., Chiba, M., Ferguson, H.C., Gilbert, K.M., Guhathakurta, P., Iye, M., Kalirai, J.S., Koch, A., Komiyama, Y., Majewski, S.R., Reitzel, D.B., Renzini, A., Rich, R.M., Smith, E., Sweigart, A.V., Tanaka, M. 1/10/2008 In: Astrophysical Journal Letters. 685, 2, p. L121-L124. 4 p.
Journal article

Age determination of six intermediate-age small magellanic cloud star clusters with HST/ACS
Glatt, K., Grebel, E.K., Sabbi, E., Gallagher III, J.S., Nota, A., Sirianni, M., Clementini, G., Tosi, M., Harbeck, D., Koch, A., Kayser, A., Costa, G.D. 12/09/2008 In: The Astronomical Journal. 136, 4, p. 1703-1727. 25 p.
Journal article

Complexity on small scales III: iron and α element abundances in the Carina dwarf spheroidal galaxy
Koch, A., Grebel, E.K., Gilmore, G.F., Wyse, R.F.G., Kleyna, J., Harbeck, D., Wilkinson, M.I., Wyn Evans, N. 13/03/2008 In: The Astronomical Journal. 135, 4, p. 1580-1597. 18 p.
Journal article

A new abundance scale for the globular cluster 47 Tuc
Koch, A., McWilliam, A. 12/03/2008 In: The Astronomical Journal. 135, 4, p. 1551-1566. 16 p.
Journal article

An accurate age determination for the small magellanic cloud star cluster NGC 121 with the Hubble Space Telescope / advanced camera for surveys
Glatt, K., Gallagher III, J.S., Grebel, E.K., Nota, A., Sabbi, E., Sirianni, M., Clementini, G., Tosi, M., Harbeck, D., Koch, A., Cracraft, M. 25/02/2008 In: The Astronomical Journal. 135, 4, p. 1106-1116. 11 p.
Journal article

Ages, distances, and fiducials for seven SMC star clusters with HST/ACS
Glatt, K., Gallagher III, J.S., Grebel, E.K., Nota, A., Sabbi, E., Sirianni, M., Clementini, G., Tosi, M., Harbeck, D., Koch, A. 2008
Meeting abstract

Kinematic and chemical constraints on the formation of M31’s inner halo structures
Reitzel, D.B., Koch, A., Rich, R.M. 2008
Meeting abstract

The first chemical abundance study of the Hercules dwarf spheroidal galaxy
Koch, A., McWilliam, A., Wilkinson, M.I. 2008
Meeting abstract

What Is a galaxy? How cold Is cold dark matter?: Recent progress in near field cosmology
Gilmore, G., Zucker, D.B., Wilkinson, M., Wyse, R.F.G., Belokurov, V., Kleyna, J., Koch, A., Evans, N.W., Grebel, E.K. 2008 In: Panoramic Views of Galaxy Formation and Evolution. p. 453-456. 4 p. ISBN: 9781583816684. Electronic ISBN: 9781583816691.
Conference contribution

A wide-field view of Leo II: a structural analysis using the Sloan Digital Sky Survey
Coleman, M.G., Jordi, K., Rix, H., Grebel, E.K., Koch, A. 1/10/2007 In: The Astronomical Journal. 134, 5, p. 1938-1951. 14 p.
Journal article

The observed properties of dark matter on small spatial scales
Gilmore, G., Wilkinson, M.I., Wyse, R.F.G., Kleyna, J., Koch, A., Wyn Evans, N., Grebel, E.K. 10/07/2007 In: The Astrophysical Journal. 663, 2, p. 948-959. 12 p.
Journal article

Stellar kinematics in the remote Leo II dwarf spheroidal galaxy: another brick in the wall
Koch, A., Kleyna, J., Wilkinson, M.I., Grebel, E.K., Gilmore, G.F., Wyn Evans, N., Wyse, R.F.G., Harbeck, D. 8/06/2007 In: The Astronomical Journal. 134, 2, p. 566-578. 13 p.
Journal article

Stellar kinematics and metallicities in the Leo I dwarf spheroidal galaxy: wide-field implications for galactic evolution
Koch, A., Wilkinson, M.I., Kleyna, J., Gilmore, G., Grebel, E.K., Mackey, A.D., Wyn Evans, N., Wyse, R.F.G. 1/03/2007 In: The Astrophysical Journal. 657, 1, p. 241-261. 21 p.
Journal article

Complexity on small scales: II. Metallicities and ages in the Leo II dwarf spheroidal galaxy
Koch, A., Grebel, E.K., Kleyna, J., Wilkinson, M.I., Harbeck, D., Gilmore, G., Wyse, R.F.G., Wyn Evans, N. 01/2007 In: The Astronomical Journal. 133, 1, p. 270-283. 14 p.
Journal article

A spectroscopy-based age-metallicity relation of the SMC
Kayser, A., Grebel, E.K., Harbeck, D., Cole, A.A., Koch, A., Glatt, K., Gallagher III, J.S., Da Costa, G. 2007 In: Stellar Populations as Building Blocks of Galaxies. Cambridge University Press p. 351-352. 2 p.
Paper

Chemical abundances in the Carina dwarf spheroidal galaxy
Koch, A., Grebel, E.K., McWilliam, A., Wyse, R.F.G., Gilmore, G.F. 2007
Meeting abstract

Chemical abundances in the Carina dwarf spheroidal galaxy
Koch, A., McWilliam, A., Grebel, E.K., Wyse, R.F.G., Gilmore, G.F. 2007
Poster

Keck/Deimos spectroscopy of distant M31 fields with deep HST imaging
Rich, R.M., Brown, T.M., Reitzel, D.B., Ferguson, H., Koch, A. 2007
Meeting abstract

Kinematic and chemical constraints on the formation of M31’s inner halo structures
Koch, A., Rich, R.M., Reitzel, D.B. 2007
Meeting abstract

Kinematic and chemical constraints on the formation of M31’s inner halo structures
Koch, A., Rich, R.M., Reitzel, D.B. 2007
Poster

Observed properties of dark matter: dynamical studies of dSph galaxies
Gilmore, G., Wilkinson, M., Kleyna, J., Koch, A., Evans, N.W., Wyse, R.F.G., Grebel, E.K. 2007 In: Nuclear Physics B - Proceedings Supplements. 173, p. 15-18. 4 p.
Journal article

Stellar kinematics in the remote Leo I and II dwarf spheroidals
Koch, A., Wilkinson, M.I., Kleyna, J., Gilmore, G.F., Grebel, E.K., Evans, N.W., Wyse, R.F.G. 2007
Poster

The Bulge Radial Velocity Assay [BRAVA]: techniques and results
Howard, C.D., Reitzel, D.B., Rich, R.M., Koch, A., Zhao, H. 2007
Poster

The line of sight velocity distribution of the Galactic bulge
Reitzel, D.B., Howard, C.D., Rich, R.M., Koch, A., Zhao, H. 2007
Meeting abstract

Further evidence of a merger origin for the thick disk: galactic stars along lines of sight to dwarf spheroidal galaxies
Wyse, R.F.G., Gilmore, G., Norris, J., Wilkinson, M.I., Kleyna, J., Koch, A., Evans, N.W., Grebel, E. 1/03/2006 In: Astrophysical Journal Letters. 639, 1, p. L13-L16. 4 p.
Journal article

The anisotropic distribution of M31 satellite galaxies: a polar great plane of early-type companions
Koch, A., Grebel, E.K. 03/2006 In: The Astronomical Journal. 131, 3, p. 1405-1415. 11 p.
Journal article

Complexity on small scales: the metallicity distribution of the Carina dwarf spheroidal galaxy
Koch, A., Grebel, E.K., Wyse, R.F.G., Kleyna, J., Wilkinson, M.I., Harbeck, D., Gilmore, G., Wyn Evans, N. 02/2006 In: The Astronomical Journal. 131, 2, p. 895-911. 17 p.
Journal article

Chemical and kinematical evolution in nearby dwarf spheroidal galaxies
Koch, A. 2006 University of Basel. 194 p.
Doctoral Thesis

Probing the dark matter content of Local Group dwarf spheroidal galaxies with FLAMES
Wilkinson, M.I., Kleyna, J., Gilmore, G., Evans, N.W., Koch, A., Grebel, E.K., Wyse, R.F.G., Harbeck, D. 2006 In: The Messenger. 124, p. 25-29. 5 p.
Journal article

The age-metallicity degeneracy in the dwarf spheroidal Carina as seen by FLAMES
Koch, A., Grebel, E.K., Wyse, R.F.G., Kleyna, J., Wilkinson, M.I., Harbeck, D., Gilmore, G., Evans, N.W. 2006 In: The Messenger. 123, p. 38-40. 3 p.
Journal article

The internal kinematics of dwarf spheroidal galaxies
Wilkinson, M.I., Kleyna, J., Evans, N.W., Gilmore, G., Read, J.I., Koch, A., Grebel, E.K., Irwin, M. 2006 In: EAS Publications Series. 20, p. 29-32. 4 p.
Journal article

Andromeda IX: properties of the faintest M31 dwarf satellite galaxy
Harbeck, D., Gallagher III, J.S., Grebel, E.K., Koch, A., Zucker, D.B. 10/04/2005 In: The Astrophysical Journal. 623, 1, p. 159-163. 5 p.
Journal article

Chemical evolution in the Carina dwarf spheroidal
Koch, A., Grebel, E.K., Harbeck, D., Wilkinson, M.I., Kleyna, J., Gilmore, G., Wyse, R.F.G., Evans, N.W. 2005 In: Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites. Springer p. 249-251. 3 p. ISBN: 9783540341352. Electronic ISBN: 9783540341369.
Conference contribution

Further evidence for a merger origin for the Thick disk: Galactic stars along line-of-sight to dwarf spheroidal galaxies
Wyse, R.F.G., Gilmore, G., Norris, J., Wilkinson, M.I., Kleyna, J., Koch, A., Evans, N.W., Grebel, E.K. 2005
Meeting abstract

Satellite anisotropies: a polar great plane of M31 early-type companions
Grebel, E.K., Koch, A., Sambhus, N. 2005
Meeting abstract

Star clusters in the large magellanic cloud
Glatt, K., Grebel, E.K., Koch, A. 2005
Meeting abstract

Stellar kinematics in the Leo I dwarf spheroidal galaxy: wide field implications for galactic mass profiles
Koch, A., Wilkinson, M.I., Kleyna, J., Gilmore, G., Evans, N.W., Grebel, E.K. 2005
Meeting abstract

Substructure in dwarf spheroidals: a star cluster connection?
Wilkinson, M.I., Kleyna, J., Evans, N.W., Gilmore, G., Grebel, E.K., Koch, A., Read, J., Young, R. 2005 In: Proceedings of the International Astronomical Union. 1, C198, p. 240-243. 4 p.
Journal article

The chemical evolution of subpopulations in the Carina dwarf spheroidal
Koch, A., Wilkinson, M., Grebel, E.K., Harbeck, D., Kleyna, J., Wyse, R.F.G., Gilmore, G., Evans, N.W. 2005 In: Proceedings of the International Astronomical Union. 1, C198, p. 134-138. 5 p.
Journal article

Mass segregation in the globular cluster Palomar 5 and its tidal tails
Koch, A., Grebel, E.K., Odenkirchen, M., Martínez-Delgado, D., Caldwell, J.A.R. 11/2004 In: The Astronomical Journal. 128, 5, p. 2274-2287. 14 p.
Journal article

Correcting spatial gradients: the case of Wide Field Imager photometry
Koch, A., Grebel, E.K., Odenkirchen, M., Caldwell, J.A.R. 2004 In: The Messenger. 115, p. 37-39. 3 p.
Journal article

R-process and α-elements in the Galactic disk: kinematic correlations
Koch, A., Grebel, E.K. 2004 In: Planets to Cosmology. Cambridge University Press 5 p. ISBN: 9780511166617.
Conference contribution

The luminosity function of Palomar 5 and Its tidal tails
Koch, A., Odenkirchen, M., Grebel, E.K., Martinez-Delgado, D., Caldwell, J.A.R. 2004 In: ASP Conference Series. 327, p. 333-336. 4 p.
Journal article

The metallicity and age distribution of the Carina dwarf spheroidal galaxy
Koch, A., Grebel, E.K., Harbeck, D., Wilkinson, M.I., Kleyna, J., Gilmore, G., Wyse, R.F.G., Evans, N.W. 2004
Meeting abstract

A calibration map for Wide Field Imager photometry
Koch, A., Odenkirchen, M., Grebel, E., Caldwell, J.A.R. 8/12/2003 In: Astronomical Notes / Astronomische Nachrichten. 325, 4, p. 299-306. 8 p.
Journal article

A calibration map for the Wide Field Imager
Koch, A., Odenkirchen, M., Caldwell, J.A.R., Grebel, E.K. 2003
Meeting abstract

A retrospective of r-process and a-element abundances in the Galactic disk: correlations with rotational velocity
Koch, A., Grebel, E.K., Odenkirchen, M. 2003
Meeting abstract

Mass segregation in the low-concentration globular cluster Palomar 5
Koch, A., Odenkirchen, M., Grebel, E.K., Martinez-Delgado, D., Caldwell, J.A.R. 2003
Meeting abstract

The luminosity function of the globular cluster Palomar 5 and its tidal tails
Koch, A. 2003
Master's Thesis

The mass function of the globular cluster Palomar 5 and its tidal tails
Koch, A., Odenkirchen, M., Caldwell, J.A.R., Grebel, E.K. 2003
Meeting abstract

Europium abundances in F and G disk dwarfs
Koch, A., Edvardsson, B. 01/2002 In: Astronomy and Astrophysics. 381, 2, p. 500-506. 7 p.
Journal article