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The Baryonic Halos of Isolated Elliptical Galaxies

Gemini Observatory, Colina el Pino s/n, Casilla 603, La Serena 1700000, Chile
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia
Department of Astronomy and Astrophysics, University of California Observatories, Santa Cruz, CA 95064, USA
Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P2, Canada
Departamento de Astronomía, Universidad de Concepción, Concepción 3349001, Chile
Instituto de Astrofísica, P. Universidad Católica de Chile, Santiago 7820436, Chile
Author to whom correspondence should be addressed.
Academic Editors: Duncan A. Forbes and Ericson D. López
Galaxies 2017, 5(3), 42;
Received: 23 June 2017 / Revised: 11 August 2017 / Accepted: 15 August 2017 / Published: 18 August 2017
(This article belongs to the Special Issue On the Origin (and Evolution) of Baryonic Galaxy Halos)
Without the interference of a number of events, galaxies may suffer in crowded environments (e.g., stripping, harassment, strangulation); isolated elliptical galaxies provide a control sample for the study of galaxy formation. We present the study of a sample of isolated ellipticals using imaging from a variety of telescopes, focusing on their globular cluster systems as tracers of their stellar halos. Our main findings are: (a) GC color bimodality is common even in the most isolated systems; (b) the specific frequency of GCs is fairly constant with galaxy mass, without showing an increase towards high-mass systems like in the case of cluster ellipticals; (c) on the other hand, the red fraction of GCs follows the same inverted V shape trend with mass as seen in cluster ellipticals; and (d) the stellar halos show low Sérsic indices which are consistent with a major merger origin. View Full-Text
Keywords: galaxies: star clusters: general; galaxies: halos; galaxies: elliptical and lenticular; CD galaxies: star clusters: general; galaxies: halos; galaxies: elliptical and lenticular; CD
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Salinas, R.; Alabi, A.; Hammar, N.; Richtler, T.; Lane, R.R.; Schirmer, M. The Baryonic Halos of Isolated Elliptical Galaxies. Galaxies 2017, 5, 42.

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