Elemental Abundance Distributions of Milky Way Satellite Galaxies
- Creators
-
Kirby, E. N.
- Others:
- Koleva, M.
- Prugniel, Ph.
- Vauglin, I.
Abstract
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.
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.Attached Files
Accepted Version - 1011.1530.pdf
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Additional details
- Eprint ID
- 95398
- Resolver ID
- CaltechAUTHORS:20190510-120907258
- 51256.01
- NASA Hubble Fellowship
- NAS 5-26555
- NASA
- W. M. Keck Foundation
- Created
-
2019-05-10Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Series Name
- EAS Publications Series
- Series Volume or Issue Number
- 48