J/MNRAS/491/3496ivo://CDS.VizieR/J/MNRAS/491/3496doi:10.26093/cds/vizier.74913496CDSCollins M.L.M.Tollerud E.J.Rich R.M.Ibata R.A.Martin N.F.,Chapman S.C.Gilbert K.M.Preston J.2024-08-20T20:14:43Z2021-05-31T08:27:56ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryvisible-astronomyWith a central surface brightness of {mu}_0_=29.3mag/arcsec^2^, and half-light radius of r_half_=3.1^+0.9^_-1.1_kpc, Andromeda XIX (And XIX) is an extremely diffuse satellite of Andromeda. We present spectra for ~100 red giant branch stars in this galaxy, plus 16 stars in a nearby stellar stream. With this exquisite data set, we re-derive the properties of And XIX, measuring a systemic velocity of <v_r_>=-109.0+/-1.6km/s and a velocity dispersion of {sigma}_vr_=7.8^+1.7^_-1.5_km/s (higher than derived in our previous work). We marginally detect a velocity gradient along the major axis of dv/dX=-2.1+/-1.8km/s/kpc. We find its mass-to-light ratio is higher than galaxies of comparable stellar mass ([M/L]_half_=278^+146^_-198_M_{sun}_/L_{sun}_), but its dynamics place it in a halo with a similar total mass to these galaxies. This could suggest that And XIX is a 'puffed up' dwarf galaxy, whose properties have been altered by tidal processes, similar to its Milky Way counterpart, Antlia II. For the nearby stream, we measure v_r_=-279.2+/-3.7km/s, and {sigma}_rv_=13.8^+3.5^_-2.6_km/s. We measure its metallicity, and find it to be more metal rich than And XIX, implying that the two features are unrelated. Finally, And XIX's dynamical and structural properties imply it is a local analogue to ultradiffuse galaxies (UDGs). Its complex dynamics suggest that the masses of distant UDGs measured from velocity dispersions alone should be carefully interpreted.2020MNRAS.491.3496Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/491/3496CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/491/3496https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/491/3496http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/491/3496https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/491/3496https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/491/3496http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/491/3496GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/491/3496/tablea1 (Properties of all member stars for And XIX and observed stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/3496/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/3496/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/3496/tablea1?GETtext/xml+votable180.050000true4.8886669435.013221940.0055555555555555566/15239 15299 19456 20351 20436-20437 30317 30468 30505 30551 306673.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/491/3496?format=asciiOpticaldefaultJ/MNRAS/491/3496/tablea1Properties of all member stars for And XIX and observed starsSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.Vfloatimagi magnitude (AB)magphot.mag;em.opt.IfloatHVHeliocentric velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HVrms uncertainty on HVkm/sstat.errorfloatS/NSignal-to-noise ratio (in 1/{AA} unit)stat.snrfloat[Fe/H]? Metallicity (1)phys.abund.Zfloatnullablee_[Fe/H]? rms uncertainty on [Fe/H] (1)stat.error;phys.abund.FefloatnullablePmemb[0/1] Membership probabilitystat.probabilityfloat