J/MNRAS/453/690ivo://CDS.VizieR/J/MNRAS/453/690doi:10.26093/cds/vizier.74530690CDSBate N.F.McMonigal B.Lewis G.F.Irwin M.J.Gonzalez-Solares E.,Shanks T.Metcalfe N.2024-08-15T20:15:37Z2016-04-01T14:51:10ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomysloan-photometryWe present a panoramic study of the Fornax dwarf spheroidal galaxy, using data obtained as part of the VLT Survey Telescope (VST) ATLAS Survey. The data presented here - a subset of the full survey - uniformly cover a region of 25deg^2^ centred on the galaxy, in g, r and i bands. This large area coverage reveals two key differences to previous studies of Fornax. First, data extending beyond the nominal tidal radius of the dwarf highlight the presence of a second distinct red giant branch population. This bluer red giant branch appears to be co-eval with the horizontal branch population. Secondly, a shell structure located approximately 1.4{deg} from the centre of Fornax is shown to be a mis-identified background overdensity of galaxies. This last result casts further doubt on the hypothesis that Fornax underwent a gas-rich merger in its relatively recent past.2015MNRAS.453..690Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/453/690CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/441/2555 : ATLAS 1.4GHz Data Release 2 (Hales+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/453/690https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/453/690http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/453/690https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/453/690https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/453/690http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/453/690GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/453/690/table1 (Fornax VST ATLAS catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/453/690/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/453/690/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/453/690/table1?GETtext/xml+votable180.050000true37.084774167-31.9691494440.0055555555555555565/8821 8970-8971 8992-8994 6/35197-35199 35281 35283 35292-35293 35295 35873-35876 35878-35879 35896 35898-35899 35980-35982 35984-35986 36000-36001https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/453/690?format=asciiOpticaldefaultJ/MNRAS/453/690/table1Fornax VST ATLAS cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintRA_ICRSRight ascension (ICRS)pos.eq.ra;meta.mainindexedDE_ICRSDeclination (ICRS)pos.eq.dec;meta.maingmag? g magnitude (Vega)magphot.mag;em.opt.Bfloatnullablee_gmag? rms uncertainty on gmagmagstat.error;phot.mag;em.opt.BfloatnullablegclassClassification from g band (1)meta.code.classintrmag? r magnitude (Vega)magphot.mag;em.opt.Rfloatnullablee_rmag? rms uncertainty on rmagmagstat.error;phot.mag;em.opt.RfloatnullablerclassClassification from r band (1)meta.code.classintimag? i magnitude (Vega)magphot.mag;em.opt.Ifloatnullablee_imag? rms uncertainty on imagmagstat.error;phot.mag;em.opt.IfloatnullableiclassClassification from i band (1)meta.code.classint