J/ApJ/906/96ivo://CDS.VizieR/J/ApJ/906/96doi:10.26093/cds/vizier.19060096CDSApplebaum E.Brooks A.M.Christensen C.R.Munshi F.Quinn T.R.Shen S.,Tremmel M.2022-09-05T14:21:14Z2022-06-02T07:35:45ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesWe 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{sun}, 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=0.2021ApJ...906...96Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/906/96CatalogResearchIsServedByTAP VizieR generic servicerelated-toVI/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)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/906/96https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/906/96http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/906/96https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/906/96https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/906/96http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/906/96GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/906/96/table2Properties of individual dwarf galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimSimulation identifier; Elena or Sandrameta.idcharHalo[2/6062] Simulation halo numbermeta.id;meta.mainintMvir[1100000/91000000000] Virial masssolMassphys.massfloatMpeak[34000000/130000000000] Peak halo masssolMassphys.mass;stat.maxfloatMass[4300/2000000000] Stellar masssolMassphys.massfloatMgas[0/6500000000] Total gas masssolMassphys.massfloatMHI[0/2300000000] HI masssolMassphys.massfloatVMag[-18.5/-3] Absolute V band magnitudemagphys.magAbsfloatrh[48/2730]? Half-light radius; see Section 4.4pcphys.size.radiusintnullable[Fe/H][-3.9/-0.9] Metallicitylog(Sun)phys.abund.ZfloatRgal[43/878] Galactocentric distancekpcpos.distance;pos.galactocentricinttau90[0.1/13] Time when 90% of stars have formedGyrtime.epochfloatf_tau90[*] Indicates star formation still ongoingmeta.codechar