AK
A. J Koch-Hansen
astro-ph.GAastro-ph.SRastro-phastro-ph.COastro-ph.IMastro-ph.HEhep-ph
On Valency
published · living versionsW_6as5kqt2·v1 · currentpublished
Milky Way archaeology using RR Lyrae and type II Cepheids II. High velocity RR Lyrae stars, and mass of the Milky Way
with Z. Prudil, B. Lemasle, E. K. Grebel, T. Marchetti +8
1 version
W_b37pgw7b·v1published
Preprints & journals
134 papers in the corpus · 2001–2020Difference in chemical composition between the bright and faint red clump stars in the Milky Way bulge2012.03954v1 · Dongwook Lim, Young-Wook Lee, Andreas Koch et al.2020 · 14 citationsarXiv
Mono-enriched stars and Galactic chemical evolution -- Possible biases in observations and theory2009.11876v1 · Camilla Juul Hansen, Andreas Koch, Lyudmila Mashonkina et al.2020 · 26 citationsA&A 643, A49 (2020)
The Blanco DECam Bulge Survey. I. The Survey Description and Early Results2008.09255v2 · R. Michael Rich, Christian I. Johnson, Michael Young et al.2020 · 21 citationsarXiv
Blanco DECam Bulge Survey (BDBS) II: Project Performance, Data Analysis, and Early Science Results2008.09257v1 · Christian I. Johnson, R. Michael Rich, Michael D. Young et al.2020 · 33 citationsarXiv
The Magellanic Edges Survey I. Description and First Results2007.06780v1 · L. R. Cullinane, A. D. Mackey, G. S. Da Costa et al.2020 · 29 citationsarXiv
An optimised tiling pattern for multi-object spectroscopic surveys: application to the 4MOST survey2007.03307v1 · E. Tempel, T. Tuvikene, M. M. Muru et al.2020 · 10 citationsarXiv
The age of the Milky Way inner stellar spheroid from RR Lyrae population synthesis2006.12507v1 · A. Savino, A. Koch, Z. Prudil et al.2020 · 66 citationsA&A 641, A96 (2020)
The Bulge Radial Velocity Assay for RR Lyrae stars (BRAVA-RR) DR2: a Bimodal Bulge?2004.11382v1 · Andrea Kunder, Angeles Perez-Villegas, R. Michael Rich et al.2020 · 63 citationsarXiv
Purveyors of fine halos. II. Chemodynamical association of halo stars with Milky Way globular clusters2004.00018v2 · Michael Hanke, Andreas Koch, Zdenek Prudil et al.2020 · 32 citationsA&A 637, A98 (2020)
The Halos and Environments of Nearby Galaxies (HERON) II: The outer structure of edge-on galaxies2003.03392v1 · Aleksandr Mosenkov, R. Michael Rich, Andreas Koch et al.2020 · 23 citationsarXiv
Probabilistic fibre-to-target assignment algorithm for multi-object spectroscopic surveys2001.09348v2 · E. Tempel, P. Norberg, T. Tuvikene et al.2020 · 11 citationsA&A 635, A101 (2020)
An outer shade of Pal: Abundance analysis of the outer halo globular cluster Palomar 131910.13506v1 · Andreas Koch, Patrick Cot'e2019 · 13 citationsA&A 632, A55 (2019)
The mass fraction of halo stars contributed by the disruption of globular clusters in the E-MOSAICS simulations1910.06973v1 · Marta Reina-Campos (Heidelberg), Meghan E. Hughes (LJMU), J. M. Diederik Kruijssen (Heidelberg) et al.2019 · 29 citationsarXiv
Identification of strontium in the merger of two neutron stars.31645733 · Watson, Darach, Hansen, Camilla J, Selsing, Jonatan et al.2019 · 482 citationsNature. 2019;574(7779):497-500
The Halos and Environments of Nearby Galaxies (HERON) I: Imaging, Sample Characteristics, and Envelope Diameters1907.10706v3 · R. Michael Rich, Aleksandr Mosenkov, Henry Lee-Saunders et al.2019 · 44 citationsarXiv
Chemical composition of the outer halo globular cluster Palomar 151907.02071v1 · Andreas Koch, Siyi Xu, R. Michael Rich2019 · 5 citations2019, A&A, 627, A70
Cold, old and metal-poor: New stellar substructures in the Milky Way's dwarf spheroidals1904.10560v1 · V. Lora, E. K. Grebel, S. Schmeja et al.2019 · 8 citationsarXiv
Purveyors of fine halos: Re-assessing globular cluster contributions to the Milky Way halo build-up with SDSS-IV1904.02146v1 · Andreas Koch, Eva K. Grebel, Sarah L. Martell2019 · 48 citationsA&A 625, A75 (2019)
A tidal tale: detection of multiple stellar streams in the environment of NGC10521903.07285v2 · Oliver Muller, R. Michael Rich, Javier Rom'an et al.2019 · 51 citationsA&A 624, L6 (2019)
4MOST: Project overview and information for the First Call for Proposals1903.02464v2 · R.S. de Jong, O. Agertz, A. Agudo Berbel et al.2019 · 406 citationsThe Messenger, 2019, 175, 3
4MOST Consortium Survey 9: One Thousand and One Magellanic Fields (1001MC)1903.02475v2 · M.-R.L. Cioni, J. Storm, C.P.M. Bell et al.2019 · 18 citationsThe Messenger, 2019, 175, 54
Abundances and kinematics of carbon-enhanced metal-poor stars in the Galactic halo*; A new classification scheme based on Sr and Ba1901.05968v1 · Camilla J. Hansen, Terese T. Hansen, Andreas Koch et al.2019 · 65 citationsA&A 623, A128 (2019)
Unusual neutron-capture nucleosynthesis in a carbon-rich Galactic bulge star1812.07574v1 · A. Koch, M. Reichert, C.J. Hansen et al.2018 · 25 citationsA&A 622, A159 (2019)
TOPoS V: Abundance ratios in a sample of very metal-poor turn-off stars1811.00035v1 · P. Francois, E. Caffau, P. Bonifacio et al.2018 · 10 citationsarXiv
ATHOS: On-the-fly stellar parameter determination of FGK stars based on flux ratios from optical spectra1809.01655v1 · Michael Hanke, Camilla Juul Hansen, Andreas Koch et al.2018 · 25 citationsA&A 619, A134 (2018)
Search for an intrinsic metallicity spread in old globular clusters of the Large Magellanic Cloud1809.01709v1 · Andr'es E. Piatti, Andreas Koch2018 · 26 citationsarXiv
Kinematics of outer halo globular clusters: M 75 and NGC 64261805.06894v1 · Andreas Koch, Michael Hanke, Nikolay Kacharov2018 · 5 citationsA&A 616, A74 (2018)
Radial velocities of RR Lyrae stars in and around NGC 64411802.09562v1 · Andrea Kunder, Arthur Mills, Joseph Edgecomb et al.2018 · 11 citationsarXiv
Kron 3: a fourth intermediate age cluster in the SMC with evidence of multiple populations1801.09670v1 · K. Hollyhead, C. Lardo, N. Kacharov et al.2018 · 26 citationsarXiv
TOPoS: IV. Chemical abundances from high-resolution observations of seven EMP stars1801.03935v1 · P. Bonifacio, E. Caffau, M. Spite et al.2018 · 86 citationsA&A 612, A65 (2018)
Detailed chemical abundance analysis of the thick disk star cluster Gaia 11709.04022v1 · Andreas Koch, Terese T. Hansen, Andrea Kunder2017 · 14 citationsA&A 609, A13 (2018)
Spectroscopic confirmation of the low-latitude object FSR 1716 as an old globular cluster1708.06351v2 · Andreas Koch, Andrea Kunder, Jennifer Wojno2017 · 10 citationsA&A 605, A128 (2017)
Abundance analysis of a CEMP-no star in the Carina dwarf spheroidal galaxy1706.06599v1 · A. Susmitha, A. Koch, T. Sivarani2017 · 20 citationsA&A 606, A112 (2017)
The binary fraction of stars in dwarf galaxies: the case of Leo II1706.04184v1 · Meghin Spencer, Mario Mateo, Matthew Walker et al.2017 · 48 citationsAJ, Vol. 153, Number 6, 254 (2017)
The Gaia-ESO Survey: Galactic evolution of sulphur and zinc1704.02981v1 · S. Duffau, E. Caffau, L. Sbordone et al.2017 · 57 citationsA&A 604, A128 (2017)
Spectroscopic study of the elusive globular cluster ESO452-SC11 and its surroundings1703.06921v2 · Andreas Koch, Camilla Juul Hansen, Andrea Kunder2017 · 15 citationsarXiv
Galactic Pal-eontology: Abundance Analysis of the Disrupting Globular Cluster Palomar 51703.02972v1 · Andreas Koch, Patrick Cot'e2017 · 12 citationsarXiv
Insights into the chemical composition of the metal-poor Milky Way halo globular cluster NGC 64261612.05989v1 · M. Hanke, A. Koch, C. J. Hansen et al.2016 · 31 citationsA&A 599, A97 (2017)
Something borrowed, something blue: The nature of blue metal-poor stars inferred from their colours and chemical abundances1611.03494v1 · C. J. Hansen, P. Jofre, A. Koch et al.2016 · 8 citationsA&A 598, A54 (2017)on Valency
Another look at the size of the low-surface brightness galaxy VCC 1661 in the Virgo Cluster1610.07831v1 · Andreas Koch, Christine S. Black, R. Michael Rich et al.2016 · 5 citationsarXiv
TOPoS: III. An ultra iron-poor multiple CEMP system1610.04106v1 · E. Caffau, P. Bonifacio, M. Spite et al.2016 · 38 citationsarXiv
The Halos and Environments of Nearby Galaxies (HERON) Survey1610.02775v1 · R. Michael Rich, Noah Brosch, James Bullock et al.2016 · 5 citationsarXiv
Evidence for multiple populations in the intermediate age cluster Lindsay 1 in the SMC1609.01302v1 · K Hollyhead, N Kacharov, C Lardo et al.2016 · 55 citationsarXiv
A new algorithm for optimizing the wavelength coverage for spectroscopic studies: Spectral Wavelength Optimization Code (SWOC)1606.00833v1 · G. R. Ruchti, S. Feltzing, K. Lind et al.2016 · 13 citationsarXiv
Chemical abundances in a high velocity RR Lyrae star near the bulge1603.05654v1 · Camilla Juul Hansen, Robert Michael Rich, Andreas Koch et al.2016 · 22 citationsA&A 590, A39 (2016)
Metal-poor stars towards the Galactic bulge - a population potpourri1511.01490v1 · Andreas Koch, Andrew McWilliam, George W. Preston et al.2015 · 76 citationsarXiv
Major mergers with small galaxies - the discovery of a Magellanic-type galaxy at z=0.121511.01499v1 · Andreas Koch, Matthias J. Frank, Anna Pasquali et al.2015 · 5 citationsarXiv
Triangulum II: a very metal-poor and dynamically hot stellar system1510.04433v2 · Nicolas F. Martin, Rodrigo A. Ibata, Michelle L. M. Collins et al.2015 · 56 citationsarXiv
Evidence for a chemical enrichment coupling of globular clusters and field stars in the Fornax dSph1510.03880v1 · Benjamin Hendricks, Corrado Boeche, Christian I. Johnson et al.2015 · 16 citationsA&A 585, A86 (2016)
Strömgren uvby photometry of the peculiar globular cluster NGC 24191510.02482v1 · Matthias J. Frank, Andreas Koch, Sofia Feltzing et al.2015 · 17 citationsA&A, 581 (2015) A72
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