J/ApJ/906/96 Dwarfs galaxies in DC Justice League Simulations (Applebaum+, 2021)
Ultrafaint Dwarfs in a Milky Way Context: Introducing the Mint Condition DC
Justice League Simulations.
Applebaum E., Brooks A.M., Christensen C.R., Munshi F., Quinn T.R., Shen S.,
Tremmel M.
<Astrophys. J., 906, 96 (2021)>
=2021ApJ...906...96A 2021ApJ...906...96A
ADC_Keywords: Galaxies
Keywords: Dwarf galaxies ; Galaxy evolution ; Hydrodynamical simulations ;
Galaxy quenching
Abstract:
We present results from the "Mint" resolution DC Justice League suite
of Milky Way-like zoom-in cosmological simulations, which extend our
study of nearby galaxies down into the ultrafaint dwarf (UFD) regime
for the first time. The mass resolution of these simulations is the
highest ever published for cosmological Milky Way zoom-in simulations
run to z=0, with initial star (dark matter) particle masses of
994(17900)M☉, and a force resolution of 87pc. We study the
surrounding dwarfs and UFDs, and find that the simulations match the
observed dynamical properties of galaxies with -3>MV>-19, and
reproduce the scatter seen in the size-luminosity plane for rh≳200pc.
We predict the vast majority of nearby galaxies will be observable by
the Vera Rubin Observatory's coadded Legacy Survey of Space and Time.
We additionally show that faint dwarfs with velocity dispersions
≲5km/s result from severe tidal stripping of the host halo. We
investigate the quenching of UFDs in a hydrodynamical Milky Way
context and find that the majority of UFDs are quenched prior to
interactions with the Milky Way, though some of the quenched UFDs
retain their gas until infall. Additionally, these simulations yield
some unique dwarfs that are the first of their kind to be simulated,
e.g., an H i-rich field UFD, a late-forming UFD that has structural
properties similar to Crater 2, as well as a compact dwarf satellite
that has no dark matter at z=0.
Description:
We have presented a new set of cosmological hydrodynamic simulations
of Milky Way-like galaxies, capable of resolving satellite and
near-field galaxies down to MV~-4. These simulations simultaneously
produce realistic galaxies from the UFD regime to Milky Way mass, with
the same feedback and star formation recipes for all galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 78 86 Properties of individual dwarf galaxies
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See also:
VI/146 : Galaxies in the Cosmic Dawn II simulation (Ocvirk+, 2020)
J/A+AS/134/75 : Central Fornax Cluster. II. Galaxy spectroscopy (Hilker+ 1999)
J/ApJ/708/560 : Spectroscopy of UMa II and Coma Ber (Frebel+, 2010)
J/ApJ/723/1632 : Abundance spreads in Bootes I and Segue 1 (Norris+, 2010)
J/AJ/142/199 : Sizes and luminosities of stellar systems (Brodie+, 2011)
J/ApJ/736/146 : Radial velocities of stars in Bootes I (Koposov+, 2011)
J/AJ/144/4 : Properties dwarf galaxies in Local Group (McConnachie+, 2012)
J/ApJ/770/16 : Spectroscopic members of Segue 2 galaxy (Kirby+, 2013)
J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)
J/AJ/145/149 : ALFALFA discovery of Leo P. II. BVR photometry (Rhode+, 2013)
J/ApJ/767/134 : Abundances of red giant stars in UFD galaxies (Vargas+, 2013)
J/ApJ/789/147 : Star formation histories of LG dwarf galaxies (Weisz+, 2014)
J/ApJ/812/158 : Leo P RR Lyrae candidates & cumulative SFH (McQuinn+, 2015)
J/MNRAS/466/2006 : Phoenix dwarf galaxy RV and [Fe/H] catalog (Kacharov+, 2017)
J/ApJ/837/106 : UV background photoionization & photoheating (Onorbe+, 2017)
J/ApJ/857/145 : MagLiteS Carina II and Carina III spectroscopy (Li+, 2018)
J/ApJ/863/89 : Gaia DR2 PMs stars in ultra-faint MW satellites (Simon, 2018)
J/ApJ/893/47 : Milky Way satellite census I. DES & PS1 (Drlica-Wagner+, 2020)
J/ApJ/889/27 : Abundances of 11 stars in Carina II and III (Ji+, 2020)
J/AJ/159/46 : Elemental abundances 416 stars 5 dSphs of M31 (Kirby+, 2020)
J/A+A/635/A152 : Tucana dSph galaxy spectroscopic dataset (Taibi+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Sim Simulation identifier; Elena or Sandra
8- 11 I4 --- Halo [2/6062] Simulation halo number
13- 19 E7.1 Msun Mvir [1100000/91000000000] Virial mass
21- 27 E7.1 Msun Mpeak [34000000/130000000000] Peak halo mass
29- 35 E7.1 Msun Mass [4300/2000000000] Stellar mass
37- 43 E7.1 Msun Mgas [0/6500000000] Total gas mass
45- 51 E7.1 Msun MHI [0/2300000000] HI mass
53- 57 F5.1 mag VMag [-18.5/-3] Absolute V band magnitude
59- 62 I4 pc rh [48/2730]? Half-light radius; see Section 4.4
64- 67 F4.1 [Sun] [Fe/H] [-3.9/-0.9] Metallicity
69- 71 I3 kpc Rgal [43/878] Galactocentric distance
73- 76 F4.1 Gyr tau90 [0.1/13] Time when 90% of stars have formed
78 A1 --- f_tau90 [*] Indicates star formation still ongoing
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 18-May-2022