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Resolving the stellar outskirts of six Milky Way-like galaxies beyond the Local Group

Published online by Cambridge University Press:  21 March 2017

A. Monachesi
Affiliation:
Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, Garching D-85748, Germany
E. F. Bell
Affiliation:
Department of Astronomy, University of Michigan, 311 West Hall, 1085 South University Ave., Ann Arbor, MI 48109, USA
D. J. Radburn-Smith
Affiliation:
Department of Astronomy, University of Washington, Seattle, WA 98195, USA
B. Harmsen
Affiliation:
Department of Astronomy, University of Michigan, 311 West Hall, 1085 South University Ave., Ann Arbor, MI 48109, USA
R. S. de Jong
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, D-14482 Potsdam, Germany
J. 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
B. W. Holwerda
Affiliation:
University of Leiden, Sterrenwacht Leiden, Niels Bohrweg 2, NL-2333 CA Leiden, The Netherlands
D. Streich
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, D-14482 Potsdam, Germany
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Abstract

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 galaxy’s halos are available, mainly for the Milky Way and M31. The Galaxy Halos, Outer disks, Substructure, Thick disks and Star clusters (GHOSTS) HST survey is the largest study to date of the resolved stellar populations in the outskirts of disk galaxies and its observations offer a direct test of model predictions. Here we present the results we obtain for six highly inclined nearby Milky Way-mass spiral galaxies. We find a great diversity in the properties of their stellar halos.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 
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