A.R. Wetzel
Satellite Dwarf Galaxies in a Hierarchical Universe: Infall Histories, Group Preprocessing, and Reionization
Wetzel, A.R.; Deason, A.J.; Garrison-Kimmel, S.
Abstract
In the Local Group (LG), almost all satellite dwarf galaxies that are within the virial radius of the Milky Way (MW) and Andromeda (M31) exhibit strong environmental influence. The orbital histories of these satellites provide the key to understanding the role of the MW/M31 halo, lower-mass groups, and cosmic reionization on the evolution of dwarf galaxies. We examine the virial-infall histories of satellites with M_star = 10^{3-9} M_sun using the ELVIS suite of cosmological zoom-in dissipationless simulations of 48 MW/M31-like halos. Satellites at z = 0 fell into the MW/M31 halos typically 5 - 8 Gyr ago at z = 0.5 - 1. However, they first fell into any host halo typically 7 - 10 Gyr ago at z = 0.7 - 1.5. This difference arises because many satellites experienced "group preprocessing" in another host halo, typically of M_vir ~ 10^{10-12} M_sun, before falling into the MW/M31 halos. Satellites with lower mass and/or those closer to the MW/M31 fell in earlier and are more likely to have experienced group preprocessing; half of all satellites with M_star < 10^6 M_sun were preprocessed in a group. Infalling groups also drive most satellite-satellite mergers within the MW/M31 halos. Finally, none of the surviving satellites at z = 0 were within the virial radius of their MW/M31 halo during reionization (z > 6), and only < 4% were satellites of any other host halo during reionization. Thus, effects of cosmic reionization versus host-halo environment on the formation histories of surviving dwarf galaxies in the LG occurred at distinct epochs, separated typically by 2 - 4 Gyr, so they are separable theoretically and, in principle, observationally.
Citation
Wetzel, A., Deason, A., & Garrison-Kimmel, S. (2015). Satellite Dwarf Galaxies in a Hierarchical Universe: Infall Histories, Group Preprocessing, and Reionization. Astrophysical Journal, 807(1), Article 49. https://doi.org/10.1088/0004-637x/807/1/49
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 20, 2015 |
Online Publication Date | Jun 30, 2015 |
Publication Date | Jul 1, 2015 |
Deposit Date | Feb 20, 2017 |
Publicly Available Date | Mar 24, 2017 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 807 |
Issue | 1 |
Article Number | 49 |
DOI | https://doi.org/10.1088/0004-637x/807/1/49 |
Public URL | https://durham-repository.worktribe.com/output/1394087 |
Related Public URLs | https://arxiv.org/abs/1501.01972 |
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Copyright Statement
© 2015. The American Astronomical Society. All rights reserved.
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