J/MNRAS/399/728ivo://CDS.VizieR/J/MNRAS/399/728doi:10.26093/cds/vizier.73990728CDSFittingoff A.Prochaska J.X.Kalirai J.S.Strader J.Guhathakurta P.,Kaplan K.F.2024-07-09T20:16:06Z2010-11-03T10:05:04ZCDS support team

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

cds-question@unistra.frgalaxiesultraviolet-astronomyquasarsWe have performed a wide-area ultraviolet (UV) imaging survey using the GALaxy Evolution eXplorer to search for bright, point-like UV sources behind M31's extended halo. Our survey consisted of 46 pointings covering an effective area of ~50deg^2^, in both the far-UV and near-UV channels. We combined these data with optical R-band observations acquired with the WIYN Mosaic-1 imager on the Kitt Peak National Observatory 0.9-m WIYN telescope. An analysis of the brightness and colours of sources matched between our photometric catalogues yielded ~100 UV-bright quasar candidates. We have obtained discovery spectra for 76 of these targets with the Kast spectrometer on the Lick 3-m telescope and confirmed 30 active galactic nuclei and quasars, 29 galaxies at z>0.02 including several early-type systems, 16 Galactic stars (hot main-sequence stars) and one featureless source previously identified as a BL Lac object. Future UV spectroscopy of the brightest targets with the Cosmic Origins Spectrograph on the Hubble Space Telescope will enable a systematic search for diffuse gas in the extended halo of M31.2009MNRAS.399..728Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/399/728CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/173/643 : GALEX UV photometry of M31 Globular Clusters (Rey+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/399/728https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/399/728http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/399/728https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/399/728https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/399/728http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/399/728GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/399/728/table2 (Photometry summary of GALEX/NUV-detected sources in the halo of M31.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/728/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/728/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/728/table2?GETtext/xml+votable180.050000true1.66340.44477780.005555555555555556Cone search capability for table J/MNRAS/399/728/table4 (Lick/KAST spectroscopy of QSO candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/728/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/728/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/728/table4?GETtext/xml+votable180.050000true2.0708340.039720.005555555555555556Cone search capability for table J/MNRAS/399/728/table5 (UV bright, extragalactic sources behind M31)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/399/728/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/399/728/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/399/728/table5?GETtext/xml+votable180.050000true2.102540.06258330.0055555555555555565/562 568 570 647 651-652 654 656 658 662 664-665 667 669-670 678-681 688-689 692 6/2243 2246 2252 2254 2276 2574-2575 2583 2586 2596-2597 2599 2602-2603 2613-2615 2620-2621 2638-2639 2652 2654 2667 2672 2684-2685 2688-2690 2692-2693 2701-2703 2728 2736-2737 2741 2743 2762-2763 2784 2786 2850 28567.447298006782415e-19 1.4134638842407062e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/399/728?format=asciiUVdefaultJ/MNRAS/399/728/table2Photometry summary of GALEX/NUV-detected sources in the halo of M31.SeqSequential numbermeta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGALEXGALEX name (JHHMMSS.ss+DDMMSS.s), <[FPK2009] GALEX JHHMMSS.ss+DDMMSS.s> in Simbadmeta.id;meta.maincharprimaryindexedRAJ2000GALEX right ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)pos.eq.dec;meta.mainindexedFUV? GALEX/FUV far-UV magnitude (1)magphot.mag;em.UV.100-200nmfloatnullablee_FUV? rms uncertainty on FUV (1)magstat.errorfloatnullableNUV? GALEX/NUV near-UV magnitude (2)magphot.mag;em.UV.200-300nmfloatnullablee_NUV? rms uncertainty on NUV (2)magstat.errorfloatnullableRmag? R magnitude from KPNO photometry (3)magphot.mag;em.opt.Rfloatnullablee_Rmag? rms uncertainty on Rmagmagstat.error;phot.mag;em.opt.Rfloatnullables/gStar/galaxy classifier calculated by SExtractor on the NUV photometry (4)src.class.starGalaxy;meta.modelledfloatQ?[Y/N] Quasar candidates picked based on colour relations between UV and R (5)meta.codecharJ/MNRAS/399/728/table4Lick/KAST spectroscopy of QSO candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (JHHMMSS+DDMMSS), <[FPK2009] JHHMMSS+DDMMSS> in Simbadmeta.id;meta.maincharprimaryRAJ2000GALEX right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainDateObservation datetime.epoch;obsnullableexpTExposure timestime.duration;obs.exposureintDate2Second observation datetime.epoch;obsnullableexpT2? Exposure time for second observationstime.duration;obs.exposureintnullableJ/MNRAS/399/728/table5UV bright, extragalactic sources behind M31zRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType[AG] AGN (BAL) or Galaxy (NEL) (1)meta.codecharNameName (JHHMMSS+DDMMSS), <[FPK2009] JHHMMSS+DDMMSS> in Simbadmeta.id;meta.maincharGALEXGALEX name, as in table2meta.idcharrhoImpact parameter from the centre of M31 (2)kpcsrc.impactParamintFUV? Far UV magnitude (in AB system)magphot.mag;em.UV.100-200nmfloatnullableNUV? Narrow UV magnitude (in AB system)magphot.mag;em.UV.200-300nmfloatnullableRAJ2000GALEX right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main