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Elemental Abundance Distributions of Milky Way Satellite Galaxies

Kirby, E. N. (2011) Elemental Abundance Distributions of Milky Way Satellite Galaxies. In: A Universe of Dwarf Galaxies. EAS Publications Series. No.48. EDP Sciences , Les Ulis, France, pp. 19-25. ISBN 9782759806621.

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The chemical compositions of the stars in Milky Way (MW) satellite galaxies reveals the history of gas flows and star formation (SF) intensity. This talk presented a Keck/DEIMOS spectroscopic survey of the Fe, Mg, Si, Ca, and Ti abundances of nearly 3000 red giants in eight MW dwarf satellites. The metallicity and alpha-to-iron ratio distributions obey the following trends: (1) The more luminous galaxies are more metal-rich, indicating that they retained gas more efficiently than the less luminous galaxies. (2) The shapes of the metallicity distributions of the more luminous galaxies require gas infall during their SF lifetimes. (3) At [Fe/H]< −1.5, [α/Fe] falls monotonically with increasing [Fe/H] in all MW satellites. One interpretation of these trends is that the SF timescale in any MW satellite is long enough that Type Ia supernovae exploded for nearly the entire SF lifetime.

Item Type:Book Section
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URLURL TypeDescription Paper
Kirby, E. N.0000-0001-6196-5162
Additional Information:© EAS, EDP Sciences, 2011. Support for this work was provided by NASA through Hubble Fellowship grant 51256.01 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555. Data herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and NASA. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Funding AgencyGrant Number
NASA Hubble Fellowship51256.01
NASANAS 5-26555
W. M. Keck FoundationUNSPECIFIED
Series Name:EAS Publications Series
Issue or Number:48
Record Number:CaltechAUTHORS:20190510-120907258
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Official Citation:The Elemental Abundance Distributions of Milky Way Satellite Galaxies E.N. Kirby EAS Publications Series, 48 (2011) 19-25 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95398
Deposited By: George Porter
Deposited On:10 May 2019 21:04
Last Modified:03 Oct 2019 21:13

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