J/ApJ/909/211ivo://CDS.VizieR/J/ApJ/909/211doi:10.26093/cds/vizier.19090211CDSCarlin J.L.Mutlu-Pakdil B.Crnojevic D.Garling C.T.Karunakaran A.,Peter A.H.G.Tollerud E.Forbes D.A.Hargis J.R.Lim S.,Romanowsky A.J.Sand D.J.Spekkens K.Strader J.2023-08-16T14:38:48Z2022-09-14T09:48:57ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryhst-photometryinfrared-photometryvisible-astronomyextinctionh-i-line-emissionWe present a deep Hubble Space Telescope (HST) imaging study of two dwarf galaxies in the halos of Local Volume Large Magellanic Cloud (LMC) analogs. These dwarfs were discovered as part of our Subaru+Hyper Suprime-Cam MADCASH survey: MADCASH-1 is a satellite of NGC 2403 (D~3.2Mpc), and MADCASH-2 is a previously unknown dwarf galaxy near NGC 4214 (D~3Mpc). Our HST data reach >3.5mag below the tip of the red giant branch (TRGB) of each dwarf, allowing us to derive their structural parameters and assess their stellar populations. We measure TRGB distances (D_MADCASH-1_=3.41_-0.23_^+0.24^Mpc, D_MADCASH-2_=3.00_-0.15_^+0.13^Mpc), and confirm the dwarfs' associations with their host galaxies. MADCASH-1 is a predominantly old, metal-poor stellar system (age ~13.5Gyr, [M/H]~-2.0), similar to many Local Group dwarfs. Modelling of MADCASH-2's color-magnitude diagram suggests that it contains mostly ancient, metal-poor stars (age ~13.5Gyr, [M/H]~-2.0), but that ~10% of its stellar mass was formed 1.1-1.5Gyr ago and ~1% was formed 400-500 Myr ago. Given its recent star formation, we search MADCASH-2 for neutral hydrogen using the Green Bank Telescope, but find no emission and estimate an upper limit on the HI mass of <4.8x10^4^M_{sun}_. These are the faintest dwarf satellites known around host galaxies of LMC mass outside the Local Group (M_V,MADCASH-1_=-7.81+/-0.18, M_V,MADCASH-2_=-9.15+/-0.12), and one of them shows signs of recent environmental quenching by its host. Once the MADCASH survey for faint dwarf satellites is complete, our census will enable us to test predictions from cold dark matter models for hierarchical structure formation and discover the physical mechanisms by which low-mass hosts influence the evolution of their satellites.2021ApJ...909..211Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/909/211CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)J/A+A/503/913 : Synthetic spectrophotometry for C-rich giants (Aringer+, 2009)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/AJ/138/332 : LEDA CMD/tip of the red giant branch (Jacobs+, 2009)J/ApJ/704/898 : Photometry of the Hercules dwarf galaxy (Sand+, 2009)J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/ApJ/789/147 : Star formation histories of LG dwarf galaxies (Weisz+, 2014)J/ApJ/829/26 : Var. stars in the field of Andromeda XXV. III. (Cusano+, 2016)J/ApJ/833/167 : PAndAS view of Andromeda satellites. II. (Martin+, 2016)J/ApJ/827/89 : HST imaging of Pisces A and B (Tollerud+, 2016)J/ApJ/868/55 : Structure of M31 halo. II. PAndAS (McConnachie+, 2018)J/ApJ/863/25 : Deep Magellan obs. of 4 MW satellites (Mutlu-Pakdil+, 2018)J/ApJS/244/24 : A z=0 Multiwavelength Gal. Synthesis (z0MGS). I. (Leroy+, 2019)J/A+A/629/A18 : Deep VI photometry of 15 dwarf galaxy cand. (Mueller+, 2019)J/ApJ/888/31 : HST/ACS observations and SFH of Antlia B (Hargis+, 2020)J/ApJ/906/96 : Dwarfs gal. in DC Justice League Simulations (Applebaum+, 2021)J/ApJ/907/85 : SAGA Survey. II. Satellite systems around gal. (Mao+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/909/211https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/909/211http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/909/211https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/909/211https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/909/211http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/909/211GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/909/211/table4 (HST-derived properties of MADCASH dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/909/211/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/909/211/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/909/211/table4?GETtext/xml+votable180.050000true115.664166765.41666940.005555555555555556Cone search capability for table J/ApJ/909/211/phot (HST Photometry of MADCASH-1 and MADCASH-2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/909/211/phot?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/909/211/phot?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/909/211/phot?GETtext/xml+votable180.050000true115.709365.39906310.0055555555555555566/7784 286332.3657755224268815e-19 3.5452907792336973e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/909/211?format=asciiOpticalInfraredRadiodefaultJ/ApJ/909/211/table4HST-derived properties of MADCASH dwarfsSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameDwarf galaxy namemeta.id;meta.maincharf_NameFlag on Name (1)meta.codecharHostLikely host identifiermeta.id.parentcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.maineRA[0.5/2.5] Right ascension uncertaintyarcsecstat.error;pos.eq.rafloatDEJ2000Degree of declination (J2000)pos.eq.dec;meta.maineDE[0.4/1.4] Declination uncertaintyarcsecstat.error;pos.eq.decfloatF814Wmag[23.29/23.55] F814W_TRGB_ band magnitudemagphot.mag;em.opt.Ifloate_F814Wmag[0.11/0.15] Uncertainty on the F814Wmagmagstat.errorfloatE_F814Wmag[0.09/0.15] Upper uncertainty on F814Wmagmagstat.error;stat.maxfloatm-M[27.39/27.66] Distance modulus (2)magphot.mag.distModfloate_m-M[0.11/0.15] Lower uncertainty on m-Mmagstat.errorfloatE_m-M[0.09/0.15] Upper uncertainty on m-Mmagstat.error;stat.maxfloatDist[3/3.41] DistanceMpcpos.distance;pos.heliocentricfloate_Dist[0.15/0.23] Lower uncertainty on DistMpcstat.errorfloatE_Dist[0.13/0.24] Upper uncertainty on DistMpcstat.error;stat.maxfloat[M/H]iso[-2] Metallicity (3)phys.abund.ZfloatVMag[-9.15/-7.81] Absolute V-band magnitudemagphys.magAbs;em.opt.Vfloate_VMag[0.12/0.18] VMag uncertaintymagstat.error;phot.magfloatrh[9/10.8] Half-light radiusarcsecphys.angSize;srcfloate_rh[0.5/1] rh uncertaintyarcsecstat.errorfloatrh-pc[130.9/178.5] Rh in parsecpcphys.size.radiusfloate_rh-pc[13.5/27.5] Lower uncertainty on rh-pcpcstat.errorfloatE_rh-pc[13.3/30.3] Upper uncertainty on rh-pcpcstat.error;stat.maxfloatell[0.19/0.25] Ellipticity, {epsilon}src.ellipticityfloate_ell[0.05/0.11] ell uncertaintystat.errorfloattheta[0/76] Position angle, {theta}degpos.posAnginte_theta[11/19] theta uncertaintydegstat.error;pos.posAngintmuV[24.8/26.7] Mean surface brightness within rh, {mu}_V,eff_ (4)mag.arcsec**-2phot.mag.sbfloate_muV[0.3/0.4] muV uncertaintymag.arcsec**-2stat.errorfloatMstar[180000/630000] Stellar mass (5)solMassphys.massdoublee_Mstar[30000/60000] Mstar uncertaintysolMassstat.errordoublel_MHI/LVLimit flag on MHI/LVmeta.code.errorcharMHI/LVHI mass to light ratio, M_HI_/L_V_solMass/solLumphys.composition.massLightRatiofloatl_MHILimit flag on MHImeta.code.errorcharMHIHI masssolMassphys.massdoubleNsNumber of sources for this dwarf galaxy (link to Tables 1+2)meta.numberintnullableJ/ApJ/909/211/photHST Photometry of MADCASH-1 and MADCASH-2DEJ2000[65.38/65.46] Declination (J2000)degpos.eq.dec;meta.mainF606Wmag[18.65/28.53] HST/ACS F606W filter apparent Vega magnitude (1)magphot.mag;em.opt.Rfloate_F606Wmag[0.01/0.3] DOLPHOT uncertainty in F606Wmagmagstat.errorfloatAF606W[0.08/0.09] Galactic extinction correction in F606Wmagphys.absorptionfloatF814Wmag[17.53/27.51] HST/ACS F814W filter apparent Vega magnitude (1)magphot.mag;em.opt.Ifloate_F814Wmag[0.01/0.21] DOLPHOT uncertainty in F814Wmagmagstat.errorfloatAF814W[0.05/0.06] Galactic extinction correction in F814Wmagphys.absorptionfloatSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintdGDwarf galaxy namemeta.id.parentcharSeq[0/4806] Internal index numbermeta.id;meta.mainintRAJ2000[115.62/115.78] Right Ascension (J2000)degpos.eq.ra;meta.main