J/AJ/166/180ivo://CDS.VizieR/J/AJ/166/180doi:10.26093/cds/vizier.51660180CDSRhode K.L.Smith N.J.Crnojevic D.Sand D.J.Lambert R.A.,Vesperini E.Smith M.V.Janowiecki S.Salzer J.J.Karunakaran A.,Spekkens K.2024-11-06T20:18:04Z2024-04-24T06:43:05ZCDS support team

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

cds-question@unistra.frdwarf-galaxiesstellar-populationsinfrared-photometryvisible-astronomyphotometryextinctionWe present results from wide-field imaging of the resolved stellar populations of the dwarf spheroidal galaxies CassiopeiaIII (AndXXXII) and PerseusI (AndXXXIII), two satellites in the outer stellar halo of the Andromeda galaxy (M31). Our WIYN pODI photometry traces the red giant star population in each galaxy to ~2.5-3 half-light radii from the galaxy center. We use the tip of the red giant branch (TRGB) method to derive distances of (m-M)0=24.62{+/-}0.12mag (839_-45_^+48^kpc, or 156_-13_^+16^kpc from M31) for CasIII and 24.47{+/-}0.13mag (738_-45_^+48^kpc, or 351_-16_^+17^kpc from M31) for Per I. These values are consistent within the errors with TRGB distances derived from a deeper Hubble Space Telescope study of the galaxies inner regions. For each galaxy, we derive structural parameters, total magnitude, and central surface brightness. We also place upper limits on the ratio of neutral hydrogen gas mass to optical luminosity, confirming the gas-poor nature of both galaxies. We combine our data set with corresponding data for the M31 satellite galaxy LacertaI (AndXXXI) from earlier work and search for substructure within the RGB star populations of CasIII, PerI, and Lac I. We find an overdense region on the west side of Lac I at a significance level of 2.5{sigma}-3{sigma} and a low-significance filament extending in the direction of M31. In CasIII, we identify two modestly significant overdensities near the center of the galaxy and another at two half-light radii. PerI shows no evidence for substructure in its RGB star population, which may reflect this galaxy's isolated nature.2023AJ....166..180Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/180CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/733/46 : Velocity measurements in Segue 1 (Simon+, 2011)J/AJ/144/4 : Properties dwarf galaxies Local Group (McConnachie+, 2012)J/ApJ/756/79 : Opt photometry in 3 Local Group dwarf galaxies (Sand+, 2012)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/MNRAS/439/1015 : Velocities red giants in 7 LG dwarf galaxies (Kirby+, 2014)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/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)J/ApJ/836/137 : Deep, wide-field g,i imaging of And XXXI (Rhode+, 2017)J/ApJ/868/55 : Large-scale structure of M31 halo. II (McConnachie+, 2018)J/ApJ/906/96 : Dwarfs galaxies in DC Justice League (Applebaum+, 2021)J/ApJ/913/53 : Gas content of dwarf gal. within 2Mpc of MW (Putman+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/180https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/180http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/180https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/180https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/180http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/180GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/166/180/table1 (Catalog of resolved stars in the WIYN images of Cas III)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/166/180/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/166/180/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/166/180/table1?GETtext/xml+votable180.050000true8.6856851.74467390.005555555555555556Cone search capability for table J/AJ/166/180/table2 (Catalog of resolved stars in the WIYN images of Per I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/166/180/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/166/180/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/166/180/table2?GETtext/xml+votable180.050000true45.1208141.14129390.0055555555555555566/1023 2953 2955https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/166/180?format=asciiOpticalInfrareddefaultJ/AJ/166/180/table1Catalog of resolved stars in the WIYN images of Cas IIIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential running numbermeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedg0magCalibrated, dereddened pODI/SDSS g band magnitudemagphot.mag;em.opt.Bfloate_g0magUncertainty in g0magmagstat.error;phot.magfloatAgCaluculated Galactic extinction, g bandmagphys.absorption.galfloati0magCalibrated, dereddened pODI/SDSS i band magnitudemagphot.mag;em.opt.Ifloate_i0magUncertainty in i0magmagstat.error;phot.magfloatAiCaluculated Galactic extinction, i bandmagphys.absorption.galfloatJ/AJ/166/180/table2Catalog of resolved stars in the WIYN images of Per IrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential running numbermeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedg0magCalibrated, dereddened pODI/SDSS g band magnitudemagphot.mag;em.opt.Bfloate_g0magUncertainty in g0magmagstat.error;phot.magfloatAgCaluculated Galactic extinction, g bandmagphys.absorption.galfloati0magCalibrated, dereddened pODI/SDSS i band magnitudemagphot.mag;em.opt.Ifloate_i0magUncertainty in i0magmagstat.error;phot.magfloatAiCaluculated Galactic extinction, i bandmagphys.absorption.galfloat