VI photometry in 3 dwarf galaxiesJ/A+A/615/A96ivo://CDS.VizieR/J/A+A/615/A96doi:10.26093/cds/vizier.36150096CDSMueller O.Rejkuba M.Jerjen H.2018-09-25T13:15:41Z2018-07-30T07:54:11ZCDS support team
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
cds-question@unistra.frgalaxiesphotometryinfrared-photometryvisible-astronomybroad-band-photometryThe abundance and spatial distribution of dwarf galaxies are excellent empirical benchmarks against which to test models of structure formation on small scales. The nearby Centaurus group, with its two subgroups centered on Cen A and M 83, stands out as an important alternative to the Local Group for scrutinizing cosmological model predictions in a group of galaxies context. We have obtained deep optical images of three recently discovered M 83 satellite galaxy candidates with the FORS2 instrument mounted on the Very Large Telescope. We aim to confirm their group membership and study their stellar population. Deep V I-band photometry was used to resolve the brightest stars in our targets. Artificial star tests are performed to estimate the completeness and uncertainties of the photometry. The color-magnitude diagrams reveal the red giant branch (RGB) stars, allowing us to use the Sobel edge detection method to measure the magnitude of the RGB tip and thus derive distances and group membership for our targets. The mean metallicity of the dwarf galaxies were further determined by fitting BASTI model isochrones to the mean RGB locus.2018A&A...615A..96Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/615/A96CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/615/A96https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/615/A96http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/615/A96https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/615/A96https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/615/A96http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/615/A96GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/615/A96/table1 (Observation summary for the three dwarf galaxy candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/615/A96/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/615/A96/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/615/A96/table1?GETtext/xml+votable180.050000true201.42083-33.006940.0055555555555555566/43833 43875 43883https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/615/A96?format=asciiInfraredOpticaldefaultJ/A+A/615/A96/table1Observation summary for the three dwarf galaxy candidatesInstInstrumentmeta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainDateObserving datetime.epochcharTExpExposure timestime.duration;obs.exposurecharFilter[VI] Filter used for the observationinstr.setup;instr.filtercharAirmassMean airmass during the observationobs.airMassfloatQimgAverage image quality measured on imagesarcsecmeta.code.qualchar
J/A+A/615/A96/1325-301dw1325-30 VI chip 1 photometric catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintXposX position on the cropped chip (1)pixpos.cartesian.x;instr.detdoubleYposY position on the cropped chip (1)pixpos.cartesian.y;instr.detfloatVmag? V band magnitude with zeropoint=25magmagphot.mag;em.opt.Vfloatnullablee_Vmag? V band magnitude errormagstat.error;phot.mag;em.opt.VfloatnullableImag? I band magnitude with zeropoint=25magmagphot.mag;em.opt.Ifloatnullablee_Imag? I band magnitude errormagstat.error;phot.mag;em.opt.IfloatnullableChi? CHI valuestat.fit.chi2floatnullableSharp? Sharpness valuestat.fit.paramfloatnullable
J/A+A/615/A96/1335-291dw1335-29 VI chip 1 photometric catalogChi? CHI valuestat.fit.chi2floatnullableIDStar identification numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX position on the cropped chip (1)pixpos.cartesian.x;instr.detdoubleYposY position on the cropped chip (1)pixpos.cartesian.y;instr.detfloatVmag? V band magnitude with zeropoint=25magmagphot.mag;em.opt.Vfloatnullablee_Vmag? V band magnitude errormagstat.error;phot.mag;em.opt.VfloatnullableImag? I band magnitude with zeropoint=25magmagphot.mag;em.opt.Ifloatnullablee_Imag? I band magnitude errormagstat.error;phot.mag;em.opt.IfloatnullableSharp? Sharpness valuestat.fit.paramfloatnullable
J/A+A/615/A96/1340-302dw1340-30 VI chip 2 photometric catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintXposX position on the cropped chip (1)pixpos.cartesian.x;instr.detdoubleYposY position on the cropped chip (1)pixpos.cartesian.y;instr.detfloatVmag? V band magnitude with zeropoint=25magmagphot.mag;em.opt.Vfloatnullablee_Vmag? V band magnitude errormagstat.error;phot.mag;em.opt.VfloatnullableImag? I band magnitude with zeropoint=25magmagphot.mag;em.opt.Ifloatnullablee_Imag? I band magnitude errormagstat.error;phot.mag;em.opt.IfloatnullableChi? CHI valuestat.fit.chi2floatnullableSharp? Sharpness valuestat.fit.paramfloatnullable
J/A+A/615/A96/1335-292dw1335-29 VI chip 2 photometric catalogIDStar identification numbermeta.id;meta.maininte_Vmag? V band magnitude errormagstat.error;phot.mag;em.opt.VfloatnullableImag? I band magnitude with zeropoint=25magmagphot.mag;em.opt.IfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX position on the cropped chip (1)pixpos.cartesian.x;instr.detdoubleYposY position on the cropped chip (1)pixpos.cartesian.y;instr.detfloatVmag? V band magnitude with zeropoint=25magmagphot.mag;em.opt.Vfloatnullablee_Imag? I band magnitude errormagstat.error;phot.mag;em.opt.IfloatnullableChi? CHI valuestat.fit.chi2floatnullableSharp? Sharpness valuestat.fit.paramfloatnullable
J/A+A/615/A96/1340-301dw1340-30 VI chip 1 photometric catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification numbermeta.id;meta.mainintXposX position on the cropped chip (1)pixpos.cartesian.x;instr.detdoubleYposY position on the cropped chip (1)pixpos.cartesian.y;instr.detfloatVmag? V band magnitude with zeropoint=25magmagphot.mag;em.opt.Vfloatnullablee_Vmag? V band magnitude errormagstat.error;phot.mag;em.opt.VfloatnullableImag? I band magnitude with zeropoint=25magmagphot.mag;em.opt.Ifloatnullablee_Imag? I band magnitude errormagstat.error;phot.mag;em.opt.IfloatnullableChi? CHI valuestat.fit.chi2floatnullableSharp? Sharpness valuestat.fit.paramfloatnullable