J/ApJ/916/L19ivo://CDS.VizieR/J/ApJ/916/L19doi:10.26093/cds/vizier.19169019CDSKarunakaran A.Spekkens K.Oman K.A.Simpson C.M.Fattahi A.,Sand D.J.Bennet P.Crnojevic D.Frenk C.S.Gomez F.A.Grand R.J.J.,Jones M.G.Marinacci F.Mutlu-Pakdil B.Navarro J.F.Zaritsky D.2024-11-06T20:23:19Z2024-02-13T08:10:42ZCDS support team

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

cds-question@unistra.frdwarf-galaxiesultraviolet-photometrystar-forming-regionsWe compare the star-forming properties of satellites around Milky Way (MW) analogs from the Stage II release of the Satellites Around Galactic Analogs Survey (SAGA-II) to those from the APOSTLE and Auriga cosmological zoom-in simulation suites. We use archival GALEX UV imaging as a star formation indicator for the SAGA-II sample and derive star formation rates (SFRs) to compare with those from APOSTLE and Auriga. We compare our detection rates from the NUV and FUV bands to the SAGA-II H{alpha} detections and find that they are broadly consistent with over 85% of observed satellites detected in all three tracers. We apply the same spatial selection criteria used around SAGA-II hosts to select satellites around the MW-like hosts in APOSTLE and Auriga. We find very good overall agreement in the derived SFRs for the star-forming satellites as well as the number of star-forming satellites per host in observed and simulated samples. However, the number and fraction of quenched satellites in the SAGA-II sample are significantly lower than those in APOSTLE and Auriga below a stellar mass of M_*_~10^8^M_{sun}_, even when the SAGA-II incompleteness and interloper corrections are included. This discrepancy is robust with respect to the resolution of the simulations and persists when alternative star formation tracers are employed. We posit that this disagreement is not readily explained by vagaries in the observed or simulated samples considered here, suggesting a genuine discrepancy that may inform the physics of satellite populations around MW analogs.2021ApJ...916L..19Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/916/L19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/335 : Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)J/ApJS/164/38 : UV & FIR data of nearby galaxies (Iglesias-Paramo+, 2006)J/ApJS/173/293 : UV-Optical galaxy color-magnitude diagram I. (Wyder+, 2007)J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)J/AJ/156/18 : APOGEE DR14: companions of evolved stars (Price-Whelan+, 2018)J/ApJ/891/144 : CFHT dwarf satellite gal. around LV hosts (Carlsten+, 2020)J/ApJ/907/85 : SAGA Survey. II. Satellite systems around gal. (Mao+, 2021)J/ApJ/913/53 : Gas content of dwarf gal. within 2Mpc of MW (Putman+, 2021)J/ApJ/922/267 : Dwarf galaxies photometry & structures (Carlsten+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/916/L19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/916/L19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/916/L19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/916/L19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/916/L19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/916/L19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/916/L19/table1 (UV properties of observed satellites)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/916/L19/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/916/L19/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/916/L19/table1?GETtext/xml+votable180.050000true20.28517.60220.0055555555555555566/6437 6448 7265 7267 8506 9216 10364 10674 10680 10719 10727 10738 11402 17740-17741 18427 18669 18680 18800 18895 18917 19307 19792-19793 25886-25887 25945 25971 25974 25977 26243 26247 26258 27285 27287 27365 27367 27704-27705 28076 28381 32426-32427 32439 32480 32482 36286-36287 36338 38956 45054-45055 46034-46035 46688-46689 46736 46738 47383 47389https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/916/L19?format=asciiUVdefaultJ/ApJ/916/L19/table1UV properties of observed satellitesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobjIDSatellite galaxy objID from SAGA-IImeta.id;meta.maincharRAJ2000Right Ascension in degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in Degrees (J2000)degpos.eq.dec;meta.mainDhost[25.3/39.8] Distance of Host Galaxy from SAGA-IIMpcpos.distancefloatrcog[1/97]? Curve-of-growth radius (1)arcsecphys.angSize;srcfloatnullableSNnuv[0/242]? NUV signal-to-noise ratiostat.snr;em.UV.200-300nmfloatnullablel_NUVmagFlag on NUVmag indicating an upper limitmeta.code.error;phot.mag;em.UV.200-300nmcharNUVmag[14.7/24.4]? NUV apparent AB magnitude (2)magphot.mag;em.UV.200-300nmfloatnullablee_NUVmag[0.01/0.6]? Error on NUVmagmagstat.error;phot.mag;em.UV.200-300nmfloatnullableSNfuv[0/729.2]? FUV signal-to-noise ratiostat.snr;em.UV.100-200nmfloatnullablel_FUVmagFlag on FUVmag indicating upper limitmeta.code.error;phot.mag;em.UV.100-200nmcharFUVmag[14.8/25.3]? FUV apparent AB magnitude (2)magphot.mag;em.UV.100-200nmfloatnullablee_FUVmag[0.01/0.6]? Error on FUVmagmagstat.error;phot.mag;em.UV.100-200nmfloatnullablel_logSFRnuvFlag on logSFRNUV indicating upper limitmeta.code.errorcharlogSFRnuv[-4.1/-0.27]? Log SFR estimated using NUV luminosity (3)log(solMass.yr**-1)phys.SFR;em.UV.200-300nmfloatnullableSF[NY] Star-forming Classification (4)meta.codecharGALEXTileComplete GALEX Tile Namemeta.id;obschar