J/AJ/141/205ivo://CDS.VizieR/J/AJ/141/205doi:10.26093/cds/vizier.51410205CDSHoversten E.A.Gronwall C.Vanden Berk D.E.Basu-Zych A.R.,Breeveld A.A.Brown P.J.Kuin N.P.M.Page M.J.Roming P.W.A.,Siegel M.H.2012-11-02T16:11:28Z2012-10-20T14:49:24ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryultraviolet-astronomyh-ii-regionsWe present Swift UV/Optical Telescope (UVOT) imaging of the galaxies M81 and Holmberg IX. We combine UVOT imaging in three near-ultraviolet (NUV) filters (uvw2: 1928{AA}; uvm2: 2246{AA}; uvw1: 2600{AA}) with ground-based optical imaging from the Sloan Digital Sky Survey to constrain the stellar populations of both galaxies. Our analysis consists of three different methods. First, we use the NUV imaging to identify UV star-forming knots and then perform spectral energy distribution (SED) modeling on the UV/optical photometry of these sources. Second, we measure surface brightness profiles of the disk of M81 in the NUV and optical. Lastly, we use SED fitting of individual pixels to map the properties of the two galaxies.2011AJ....141..205Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/141/205CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/438/181 : Observations of H II Regions in M81 (Hill+ 1995)J/ApJ/554/202 : ROSAT X-ray observations of M81 (Immler+, 2001)J/ApJS/144/213 : Chandra X-ray observations of M81 (Swartz+, 2003)J/AJ/126/1286 : Halpha+[NII] observations of M81 HII regions (Lin+, 2003)J/ApJ/648/987 : UV through far-IR analysis of M81 (Perez-Gonzalez+, 2006)J/other/Ser/179.87 : Halpha in HII regions of Holmberg IX (Arbutina+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/141/205https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/141/205http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/141/205https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/141/205https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/141/205http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/141/205GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/141/205/table3 (Source photometry and fitted parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/141/205/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/141/205/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/141/205/table3?GETtext/xml+votable180.050000true149.064868.92750.0055555555555555566/76062.040811542443644e-19 1.2058628298368645e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/141/205?format=asciiUVOpticaldefaultJ/AJ/141/205/table1Swift UVOT observations of M81tuUVOT exposure time in u filterstime.duration;obs.exposure;em.opt.UinttbUVOT exposure time in b filterstime.duration;obs.exposure;em.opt.BintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of target of observation (1)meta.id;meta.maincharObsIDSwift observation ID numbermeta.idcharDateDate of Swift observationtime.epochchartuvw2UVOT exposure time in uvw2 filterstime.duration;obs.exposureinttuvm2UVOT exposure time in uvm2 filterstime.duration;obs.exposureinttuvw1UVOT exposure time in uvw1 filterstime.duration;obs.exposureinttvUVOT exposure time in v filterstime.duration;obs.exposure;em.opt.BintOffsetObservation position offset from M81 centerarcminpos.angDistance;obsfloatJ/AJ/141/205/table3Source photometry and fitted parametersDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy in which source resides (M81 or HoIX)meta.id.parentcharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainuvw2UVOT UVW2 filter AB magnitude (1)magphot.mag;em.UVfloate_uvw2Random error in uvw2mag (2)magstat.errorfloatuvm2UVOT UVM2 filter AB magnitude (1)magphot.mag;em.UVfloate_uvm2Random error in uvm2mag (2)magstat.errorfloatuvw1UVOT UVW1 filter AB magnitude (1)magphot.mag;em.UVfloate_uvw1Random error in uvw2mag (2)magstat.errorfloatumagSDSS u filter AB magnitude (1)magphot.mag;em.opt.Ufloate_umagRandom error in umag (2)magstat.error;phot.mag;em.opt.UfloatgmagSDSS g filter AB magnitude (1)magphot.mag;em.opt.Bfloate_gmagRandom error in gmag (2)magstat.error;phot.mag;em.opt.BfloatrmagSDSS r filter AB magnitude (1)magphot.mag;em.opt.Rfloate_rmagRandom error in rmag (2)magstat.error;phot.mag;em.opt.RfloatimagSDSS i filter AB magnitude (1)magphot.mag;em.opt.Ifloate_imagRandom error in imag (2)magstat.error;phot.mag;em.opt.IfloatzmagSDSS z filter AB magnitude (1)magphot.mag;em.opt.Ifloate_zmagRandom error in zmag (2)magstat.error;phot.mag;em.opt.Ifloattuvw2UVOT exposure time in uvw2 filterstime.duration;obs.exposureinttuvm2UVOT exposure time in uvm2 filterstime.duration;obs.exposureinttuvw1UVOT exposure time in uvw1 filterstime.duration;obs.exposureintAreaIsophotal area in square pixels (3)pixel**2phys.areaintrchi2Reduced chi square of model fitstat.fit.chi2;stat.fit.param;meta.modelledfloatAgeBest fitting model ageMyrtime.age;meta.modelledintAVBest fitting internal extinction A_V_magphys.absorption;meta.modelledfloatDustBest fitting dust model (4)meta.id;stat.fitchar