J/MNRAS/375/831ivo://CDS.VizieR/J/MNRAS/375/831doi:10.26093/cds/vizier.73750831CDSSegall M.Ibata R.A.Irwin M.J.Martin N.F.Chapman S.2024-07-04T20:17:56Z2008-04-13T12:18:31ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryThe Draco dwarf spheroidal galaxy (dSph), with its apparent immense mass-to-light ratio and compact size, holds many clues to the nature of the enigmatic dark matter. Here we present deep photometric studies of this dwarf galaxy, undertaken with the MegaCam Camera at the Canada-France-Hawaii Telescope, the Wide Field Camera at the Isaac Newton Telescope and the Wide Field and Planetary Camera onboard the Hubble Space Telescope (HST). The new photometric data cover the entirety of the galaxy, and reach i'=24.5 at 50 per cent completeness, significantly deeper than previous panoramic studies, allowing searches for tidal disturbances of much lower surface brightness than has been possible before. With these improved statistics, we find no evidence for asymmetric disturbances or tidal tails that possess more than 3 per cent of the stars found within the centre of the galaxy. We find that the central stellar density, as probed by the HST data, rises into the central 0.5arcmin. Uncertainties in the position of the centroid of the galaxy do not allow us to determine whether the apparent flattening of the profile interior to 0.5arcmin is reliable or not. Draco is therefore a flawless dwarf galaxy, featureless and apparently unaffected by Galactic tides.2007MNRAS.375..831Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/375/831CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/121/841 : RV photometry of Draco dwarf spheroidal galaxy (Piatek+, 2001)J/AJ/110/2131 : M/L for Draco and UMi. I. (Armandroff+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/375/831https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/375/831http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/375/831https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/375/831https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/375/831http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/375/831GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/375/831/table2 (MegaCam catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/831/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/831/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/831/table2?GETtext/xml+votable180.050000true259.189583353.41138890.005555555555555556Cone search capability for table J/MNRAS/375/831/table3 (INT catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/831/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/831/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/831/table3?GETtext/xml+votable180.050000true260.073833357.07927780.005555555555555556Cone search capability for table J/MNRAS/375/831/table5 (HST catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/375/831/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/375/831/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/375/831/table5?GETtext/xml+votable180.050000true260.014208357.89202780.0055555555555555565/2521 2545 6/10062-10063 10095 10106 10179 10185 10187-10190 10192 10194https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/375/831?format=asciiOpticaldefaultJ/MNRAS/375/831/table2MegaCam cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainindexedgmag? MegaCam g magnitude in AB system (G1)magphot.mag;em.opt.Rfloatnullablee_gmag? rms uncertainty on gmagmagstat.error;phot.mag;em.opt.BfloatnullablecgClassification parameter in g band (G2)src.class.starGalaxyintrmag? MegaCam r magnitude in AB system (G1)magphot.mag;em.opt.Rfloatnullablee_rmag? rms uncertainty on rmagmagstat.error;phot.mag;em.opt.RfloatnullablecrClassification parameter in r band (G2)src.class.starGalaxyintimag? MegaCam i magnitude in AB system (G1)magphot.mag;em.opt.Ifloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.IfloatnullableciClassification parameter in i band (G2)src.class.starGalaxyintJ/MNRAS/375/831/table3INT cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainindexedVmag? INT V magnitude converted into the MegaCam AB system (G1)magphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullablecVClassification parameter in V band (G2)src.class.starGalaxyintimag? INT i magnitude converted into the MegaCam AB system (G1)magphot.mag;em.opt.Ifloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.IfloatnullableciClassification parameter in i band (G2)src.class.starGalaxyintJ/MNRAS/375/831/table5HST cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainVmag? HST V (F606W) magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullableChi2VChi^2^ value of PSF fit for V bandstat.fit.chi2;instr.det.psf;meta.modelledfloatVsharpProfile shape (sharpness) for V bandstat.fit.paramfloatimag? HST i (F814W) magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.IfloatnullableChi2iChi^2^ value of PSF fit for i bandstat.fit.chi2;instr.det.psf;meta.modelledfloatisharpProfile shape (sharpness) for i bandstat.fit.paramfloat