J/ApJ/703/614ivo://CDS.VizieR/J/ApJ/703/614doi:10.26093/cds/vizier.17030614CDSKang Y.Bianchi L.Rey S.-C.2018-01-26T07:38:00Z2012-01-06T05:44:58ZCDS support team

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

cds-question@unistra.frultraviolet-photometrygalaxiesyoung-stellar-objectsWe present a comprehensive study of star-forming (SF) regions in the nearest large spiral galaxy M31. We use Galaxy Evolution Explorer (GALEX) far-UV (1344-1786{AA}, FUV) and near-UV (1771-2831{AA}, NUV) imaging to detect young massive stars and trace the recent star formation across the galaxy. The FUV and NUV flux measurements of the SF regions, combined with ground-based data for estimating the reddening by interstellar dust from the massive stars they contain, are used to derive their ages and masses. The GALEX imaging, combining deep sensitivity and coverage of the entire galaxy, provides a complete picture of the recent star formation in M31 and its variation with environment throughout the galaxy. The FUV and NUV measurements are sensitive to detect stellar populations younger than a few hundred Myr. We detected 894 SF regions, with size >=1600pc^2^ above an average FUV flux limit of ~26ABmag/arcsecond^2^, over the whole 26kpc (radius) galaxy disk. We derive the star formation history of M31 within this time span. The star formation rate (SFR) from the youngest UV sources (age <=10Myr) is comparable to that derived from H{alpha}, as expected.2009ApJ...703..614Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/703/614CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)J/MNRAS/399/728 : UV-bright sources behind M31 halo (Fittingoff+, 2009)J/ApJS/173/643 : GALEX UV photometry of M31 Globular Clusters (Rey+, 2007)J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+,http://galex.stsci.edu/GR4/ : GALEX GR4/GR5 data release home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/703/614https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/703/614http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/703/614https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/703/614https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/703/614http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/703/614GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/703/614/table2 (The UV detected SF regions in M31.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/703/614/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/703/614/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/703/614/table2?GETtext/xml+votable180.050000true12.01398542.6909750.0055555555555555566/2619 2622 2623 2666 2667 2705 2708 2709 27527.447298006782415e-19 1.4134638842407062e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/703/614?format=asciiUVdefaultJ/ApJ/703/614/table2The UV detected SF regions in M31.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1003/7092] Object identification (<[KBR2009] NNNN> in Simbad)meta.id;meta.mainintFUVmagGALEX FUV (1344-1786{AA}) band AB magnitudemagphot.mag;em.UVfloate_FUVmagUncertainty in FUVmagmagphot.mag;em.UVfloatNUVmagGALEX NUV (1771-2831{AA}) band AB magnitudemagphot.mag;em.UVfloate_NUVmagUncertainty in NUVmagmagphot.mag;em.UVfloatE(B-V)Reddeningmagphot.color.excessfloatAreaRegion areaarcsec**2phys.area;obs.fieldfloatAge.02? Age for Z=0.02 and MW dust type (1)Myrtime.agefloatnullableb_Age.02? Minimum Age.0.02 (1)Myrtime.age;stat.minfloatnullableB_Age.02? Maximum Age.0.02 (1)Myrtime.age;stat.maxfloatnullableM.02? Mass for Z=0.02 and MW dust type (1)solMassphys.massdoublenullableb_M.02? Minimum M.0.02 (1)solMassphys.mass;stat.mindoublenullableB_M.02? Maximum M.0.02 (1)solMassphys.mass;stat.maxdoublenullableAge.05? Age for Z=0.05 and MW dust type (1)Myrtime.agefloatnullableb_Age.05? Minimum Age.0.05 (1)Myrtime.age;stat.minfloatnullableB_Age.05? Maximum Age.0.05 (1)Myrtime.age;stat.maxfloatnullableM.05? Mass for Z=0.05 and MW dust type (1)solMassphys.massdoublenullableb_M.05? Minimum M.0.05 (1)solMassphys.mass;stat.mindoublenullableB_M.05? Maximum M.0.05 (1)solMassphys.mass;stat.maxdoublenullableRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main