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Star formation histories of dwarf galaxies in the FIRE simulations: dependence on mass and Local Group environment

Garrison-Kimmel, Shea and Wetzel, Andrew and Hopkins, Philip F. and Sanderson, Robyn and El-Badry, Kareem and Graus, Andrew and Chan, T. K. and Feldmann, Robert and Boylan-Kolchin, Michael and Hayward, Christopher C. and Bullock, James S. and Fitts, Alex and Samuel, Jenna and Wheeler, Coral and Kereš, Dušan and Faucher-Giguère, Claude-André (2019) Star formation histories of dwarf galaxies in the FIRE simulations: dependence on mass and Local Group environment. Monthly Notices of the Royal Astronomical Society, 489 (4). pp. 4574-4588. ISSN 0035-8711.

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We study star formation histories (SFHs) of 500 dwarf galaxies (stellar mass M∗=10⁵−10⁹M⊙⁠) from FIRE-2 cosmological zoom-in simulations. We compare dwarfs around individual Milky Way (MW)-mass galaxies, dwarfs in Local Group (LG)-like environments, and true field (i.e. isolated) dwarf galaxies. We reproduce observed trends wherein higher mass dwarfs quench later (if at all), regardless of environment. We also identify differences between the environments, both in terms of ‘satellite versus central’ and ‘LG versus individual MW versus isolated dwarf central.’ Around the individual MW-mass hosts, we recover the result expected from environmental quenching: central galaxies in the ‘near field’ have more extended SFHs than their satellite counterparts, with the former more closely resemble isolated (true field) dwarfs (though near-field centrals are still somewhat earlier forming). However, this difference is muted in the LG-like environments, where both near-field centrals and satellites have similar SFHs, which resemble satellites of single MW-mass hosts. This distinction is strongest for M* = 10⁶–10⁷M⊙ but exists at other masses. Our results suggest that the paired halo nature of the LG may regulate star formation in dwarf galaxies even beyond the virial radii of the MW and Andromeda. Caution is needed when comparing zoom-in simulations targeting isolated dwarf galaxies against observed dwarf galaxies in the LG.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Garrison-Kimmel, Shea0000-0002-4655-8128
Wetzel, Andrew0000-0003-0603-8942
Hopkins, Philip F.0000-0003-3729-1684
Sanderson, Robyn0000-0003-3939-3297
El-Badry, Kareem0000-0002-6871-1752
Chan, T. K.0000-0003-2544-054X
Feldmann, Robert0000-0002-1109-1919
Boylan-Kolchin, Michael0000-0002-9604-343X
Hayward, Christopher C.0000-0003-4073-3236
Bullock, James S.0000-0003-4298-5082
Fitts, Alex0000-0002-8928-6011
Samuel, Jenna0000-0002-8429-4100
Kereš, Dušan0000-0002-1666-7067
Faucher-Giguère, Claude-André0000-0002-4900-6628
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 September 4. Received 2019 July 19; in original form 2019 March 26. Published: 10 September 2019. The authors thank Cameron Hummels, Peter Behroozi, Stephanie Tonnesen, and Zach Hafen for valuable discussions, Dan Weisz and Evan Skillman for making publicly available the observed SFHs, and Oliver Hahn and Peter Behroozi for making MUSIC and Rockstar public, respectively. This work was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611. Support for SGK was provided by NASA through Einstein Postdoctoral Fellowship grant number PF5-160136 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. SGK, AW, JSB, KEB, RES, MBK, and CAFG were supported by NASA through ATP #80NSSC18K0562, 80NSSC18K1097, HST-GO-12914, HST-GO-14734, HST-GO-14191, HST-AR-13888, HST-AR-13896, HST-AR-13921, HST-AR-14282, HST-AR-14554, HST-AR-15006, HST-AR-15057, JPL 1589742, NNX17AG29G, NNX15AB22G, and 17-ATP17-0067, many of which are awarded by STScI, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555. SGK, PFH, JSB, AG, KEB, MBK, AF, TKC, DK, and CAFG were supported by the NSF through CAREER grant #1455342, CAREER grant AST-1752913, CAREER grant AST-1652522, Collaborative Research grant #1715847, AST-1517226, AST-1517491, AST-1518291, AST-1715101, AST-1715216, and an NSF Graduate Research Fellowship. Additional support was provided by the Moore Center for Theoretical Cosmology and Physics at Caltech, the Alfred P. Sloan Research Fellowship, a Berkeley graduate fellowship, a Hellman award for graduate study, the Lee A. DuBridge Postdoctoral Scholarship in Astrophysics, the Swiss National Science Foundation (grant #157591), and the Cottrell Scholarship Award from the Research Corporation for Science Advancement. The Flatiron Institute is supported by the Simons Foundation. Numerical calculations were run on the Caltech compute cluster ‘Wheeler,’ allocations from XSEDE TG-AST130039 and PRAC NSF.1713353 supported by the NSF, NASA HEC SMD-16-7223, and SMD-16-7592, and High Performance Computing at Los Alamos National Labs. This work also made use of Astropy, a community-developed core PYTHON package for Astronomy (Astropy Collaboration et al. 2013; The Astropy Collaboration et al. 2018), matplotlib (Hunter 2007), numpy (van der Walt, Colbert & Varoquaux 2011), scipy (Jones et al. 2001), ipython (Perez & Granger 2007), yt (Turk et al. 2011), ytree (Smith & Lang 2018), and NASA’s Astrophysics Data System.
Group:TAPIR, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
NASA Einstein FellowshipPF5-160136
Space Telescope Science InstituteUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Moore Center for Theoretical Cosmology and Physics, CaltechUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
University of California, BerkeleyUNSPECIFIED
Lee A. DuBridge FoundationUNSPECIFIED
Swiss National Science Foundation (SNSF)157591
Cottrell Scholar of Research CorporationUNSPECIFIED
Simons FoundationUNSPECIFIED
Subject Keywords:galaxies: dwarf – galaxies: formation – Local Group – cosmology: theory
Issue or Number:4
Record Number:CaltechAUTHORS:20191025-090648233
Persistent URL:
Official Citation:Shea Garrison-Kimmel, Andrew Wetzel, Philip F Hopkins, Robyn Sanderson, Kareem El-Badry, Andrew Graus, T K Chan, Robert Feldmann, Michael Boylan-Kolchin, Christopher C Hayward, James S Bullock, Alex Fitts, Jenna Samuel, Coral Wheeler, Dušan Kereš, Claude-André Faucher-Giguère, Star formation histories of dwarf galaxies in the FIRE simulations: dependence on mass and Local Group environment, Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 4, November 2019, Pages 4574–4588,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99444
Deposited By: Tony Diaz
Deposited On:25 Oct 2019 16:22
Last Modified:25 Oct 2019 16:22

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