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Resolving the stellar halos of six massive disk galaxies beyond the Local Group

Published online by Cambridge University Press:  09 May 2016

Antonela Monachesi ,
Eric F. Bell ,
David J. Radburn-Smith ,
Roelof S. de Jong ,
Jeremy Bailin ,
Benne Holwerda  and
David Streich
Antonela Monachesi
Affiliation:
Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, Garching D-85748, Germany email: antonela@mpa-garching.mpg.de
Eric F. Bell
Affiliation:
Department of Astronomy, University of Michigan, 311 West Hall, 1085 South University Ave., Ann Arbor, MI 48109, USA
David J. Radburn-Smith
Affiliation:
Department of Astronomy, University of Washington, Seattle, WA 98195, USA
Roelof S. de Jong
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, D-14482 Potsdam, Germany
Jeremy Bailin
Affiliation:
Department of Physics and Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL, 35487, USA National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV, 24944, USA
Benne Holwerda
Affiliation:
University of Leiden, Sterrenwacht Leiden, Niels Bohrweg 2, NL-2333 CA Leiden, The Netherlands
David Streich
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, D-14482 Potsdam, Germany
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Abstract

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Models of galaxy formation in a hierarchical universe predict substantial scatter in the halo-to-halo stellar properties, owing to stochasticity in galaxies' merger histories. Currently, only few detailed observations of stellar halos are available, mainly for the Milky Way and M31. We present the stellar halo color/metallicity and density profiles of red giant branch stars out to ~60 kpc along the minor axis of six massive nearby Milky Way-like galaxies beyond the Local Group from the Galaxy Halos, Outer disks, Substructure, Thick disks and Star clusters (GHOSTS) HST survey. This enlargement of the sample of galaxies with observations of stellar halo properties is needed to understand the range of possible halo properties, i.e. not only the mean properties but also the halo-to-halo scatter, what a ‘typical’ halo looks like, and how similar the Milky Way halo is to other halos beyond the Local Group.

Keywords

galaxies: halosgalaxies: spiralgalaxies: individual (NGC 253, NGC 891, NGC 3031, NGC 4565, NGC 4945, NGC 7814)galaxies: photometrygalaxies: stellar contentgalaxies: evolution
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. 222 - 227
Copyright
Copyright © International Astronomical Union 2016 

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