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Recent Results from SPLASH: Chemical Abundances and Kinematics of Andromeda's Stellar Halo

Published online by Cambridge University Press:  09 May 2016

Karoline M. Gilbert ,
Rachael Beaton ,
Claire Dorman  and
the SPLASH collaboration
Karoline M. Gilbert
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA email: [email protected]
Rachael Beaton
Affiliation:
The Observatories of the Carnegie Institution of Washington 813 Santa Barbara St., Pasadena, CA 91101, USA email: [email protected]
Claire Dorman
Affiliation:
UCO/Lick Observatory, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA email: [email protected]
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Abstract

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Large scale surveys of Andromeda's resolved stellar populations have revolutionized our view of this galaxy over the past decade. The combination of large-scale, contiguous photometric surveys and pointed spectroscopic surveys has been particularly powerful for discovering substructure and disentangling the structural components of Andromeda. The SPLASH (Spectroscopic and Photometric Landscape of Andromeda's Stellar Halo) survey consists of broad- and narrow-band imaging and spectroscopy of red giant branch stars in lines of sight ranging in distance from 2 kpc to more than 200 kpc from Andromeda's center. The SPLASH data reveal a power-law surface brightness profile extending to at least two-thirds of Andromeda's virial radius (Gilbert et al. 2012), a metallicity gradient extending to at least 100 kpc from Andromeda's center (Gilbert et al. 2014), and evidence of a significant population of heated disk stars in Andromeda's inner halo (Dorman et al. 2013). We are also using the velocity distribution of halo stars to measure the tangential motion of Andromeda (Beaton et al., in prep).

Keywords

galaxies: halosgalaxies: abundancesgalaxies: individual (M31)galaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Issue S317: The General Assembly of Galaxy Halos: Structure, Origin and Evolution , August 2015 , pp. 134 - 139
Copyright
Copyright © International Astronomical Union 2016 

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