GALEX EUV quasar colours of SDSS QSOs DR14 J/MNRAS/493/2745 ivo://CDS.VizieR/J/MNRAS/493/2745 doi:10.26093/cds/vizier.74932745 CDS Vanden Berk D.E. Wesolowski S.C. Yeckley M.J. Marcinik J.M.,Quashnock J.M. Machia L.M. Wu J. 2024-08-20T20:16:24Z 2020-08-10T13:45:52Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys quasars ultraviolet-photometry The rest-frame far to extreme ultraviolet (UV) colour-redshift relationship has been constructed from data on over 480,000 quasars carefully cross-matched between SDSS Data Release 14 and the final GALEX photometric catalog. UV matching and detection probabilities are given for all the quasars, including dependencies on separation, optical brightness, and redshift. Detection limits in the UV bands are also provided for all objects. The UV colour distributions are skewed redward at virtually all redshifts, especially when detection limits are accounted for. The median GALEX far-UV minus near-UV (FUV-NUV) colour-redshift relation is reliably determined up to z~2.8, corresponding to rest-frame wavelengths as short as 400{AA}. Extreme-UV (EUV) colours are substantially redder than found previously, when detection limits are properly accounted for. Quasar template spectra were forward modeled through the GALEX bandpasses, accounting for intergalactic opacity, intrinsic reddening, and continuum slope variations. Intergalactic absorption by itself cannot account for the very red EUV colours. The colour-redshift relation is consistent with no intrinsic reddening, at least for SMC-like extinction. The best model fit has a far-UV continuum power-law slope of -0.34+/-0.03 consistent with previous results, but an EUV slope of -2.90+/-0.04 that is much redder and inconsistent with any previous composite value (all >-2.0). The EUV slope difference can be attributed in part to the tendency of previous studies to preferentially select UV brighter and bluer objects. The weak EUV flux suggests quasar accretion disc models that include outflows such as disc winds. 2020MNRAS.493.2745V https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/2745 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/335 : Revised catalog of GALEX UV sources, GUVcat_AIS GR6+7 (Bianchi+ 2014) VII/286 : SDSS DR14Q catalog (Paris+, 2019) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/2745 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/2745 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/2745 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/493/2745 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/493/2745 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/493/2745 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/493/2745/dr14quv (GALEX UV data for SDSS DR14Q) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/2745/dr14quv? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/2745/dr14quv? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/2745/dr14quv? 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Should Not be used for identification. meta.record int SeqQSO SDSS DR14Q catalog sequential row number meta.id int DR14Qo SDSS DR14Q coordinate-based name, HHMMSS.ss+DDMMSS.s meta.id char DR14Q SDSS DR14Q coordinate-based name, HHMMSS.ss+DDMMSS.s, corrected by CDS meta.id;meta.main char RAdeg ? GALEX right ascension (J2000) (1) deg pos.eq.ra nullable DEdeg ? GALEX declination (J2000) (1) deg pos.eq.dec nullable BAL Broad absorption line flag [YN] meta.code.error;spect.line char FUVmag ? GALEX FUV magnitude mag phot.mag;em.UV.100-200nm float nullable e_FUVmag ? GALEX FUV magnitude uncertainty mag stat.error;phot.mag float nullable NUVmag ? GALEX NUV magnitude mag phot.mag;em.UV.200-300nm float nullable e_NUVmag ? GALEX NUV magnitude uncertainty mag stat.error;phot.mag float nullable umag ? SDSS DR14Q u PSF magnitude mag phot.mag;em.opt.U float nullable e_umag ? SDSS DR14Q u PSF magnitude uncertainty mag stat.error;phot.mag float nullable FUVmaglim ? GALEX FUV magnitude lower limit mag phot.mag;stat.min float nullable NUVmaglim ? GALEX NUV magnitude lower limit mag phot.mag;stat.min float nullable sepCoord ? SDSS and GALEX coordinate separation arcsec pos.angDistance float nullable dCent ? Distance to tile center arcmin pos.angDistance;obs.field float nullable tile-FUV ? GALEX FUV tile number meta.id int nullable tile-NUV ? GALEX NUV tile number meta.id int nullable tEff-FUV ? FUV effective exposure time s time.duration;obs.exposure double nullable tEff-NUV ? NUV effective exposure time s time.duration;obs.exposure double nullable numNbr15 Number of SDSS neighbors within 15 arcsec meta.number int dNNbr15 ? Distance to nearest SDSS neighbor (if within 15 arcseconds) arcsec pos.angDistance float nullable uNbr15 ? u magnitude of brightest SDSS neighbor (if within 15 arcseconds) mag phot.mag;em.opt.U float nullable _RA Positions from SDSS name (right ascension part) deg pos.eq.ra;meta.main indexed _DE Positions from SDSS name (declination part) deg pos.eq.dec;meta.main indexed