J/A+A/687/A313ivo://CDS.VizieR/J/A+A/687/A313doi:10.26093/cds/vizier.36870313CDSBuehler R.Schliwinski J.2024-11-29T20:04:14Z2024-07-26T08:51:54ZCDS support team

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

cds-question@unistra.frultraviolet-astronomygalaxiesactive-galactic-nucleiwhite-dwarf-starsHere, we present the 1UVA catalog of time variable ultraviolet (UV) sources. We describe a new analysis pipeline, the VAriable Source Clustering Analysis (VASCA). We apply the pipeline to 10 years of data from the GALaxy Evolution eXplorer (GALEX) satellite. We analyse a sky area of 302deg^2^, resulting in the detection of 4202 time-variable UV sources. We cross correlate these sources with multi-frequency data from the Gaia satellite and the SIMBAD database, finding an association for 3655 sources. The source sample is dominated by Active Galactic Nuclei (~73%) and stars (~24%). We look at UV and multi-frequency properties of these sources, focusing on the stellar population. We find UV variability for four White Dwarfs. One of them, WD J004917.14-252556.81, has recently been found to be the most massive pulsating White Dwarf. Its Spectral Energy Distribution shows no sign of a stellar companion. The observed flux variability is unexpected and difficult to explain.2024A&A...687A.313Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/687/A313CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/687/A313https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/687/A313http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/687/A313https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/687/A313https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/687/A313http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/687/A313GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/687/A313/sources (Properties of the 1UVA sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/687/A313/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/687/A313/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/687/A313/sources?GETtext/xml+votable180.050000true150.19490602211762.06796932237420.005555555555555556Cone search capability for table J/A+A/687/A313/detect (Properties of detections of 1UVA sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/687/A313/detect?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/687/A313/detect?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/687/A313/detect?GETtext/xml+votable180.050000true53.4137308519273-28.28994500709820.005555555555555556Cone search capability for table J/A+A/687/A313/fields (Properties of the analysed fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/687/A313/fields?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/687/A313/fields?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/687/A313/fields?GETtext/xml+votable180.050000true329.7262466081879-30.26575890903710.005555555555555556Cone search capability for table J/A+A/687/A313/coaddsrc (Properties of the co-add sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/687/A313/coaddsrc?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/687/A313/coaddsrc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/687/A313/coaddsrc?GETtext/xml+votable180.050000true53.0101968617166-27.27185778662950.0055555555555555565/124 655 677 1517-1519 1528 2287 2538 2547 2553 2606 2628 2856 2880 4421-4423 4425 4697 4758 4852 5902 6522-6523 6814 6965 8983 8989 9696 11864 6/326 457 551 557 975 1679 1700-1701 2239 2282 2561 2563-2564 2566 2619 2624 2666-2667 2705 2707 2752-2753 4308 4867 4943 4965 4976 5016 5018-5019 5099 5260-5261 5273 5276 5352 5701 5751 6044 6046-6047 6065 6090 6120 6122 7240-7241 7424-7426 7441 7444-7446 7488 7496 7498 7601-7603 7606 7612 7799 7805 7814-7815 7906 7912 7952-7953 7956 7970 8339 8705-8707 8906 8922 8969 8971-8972 9063 9072 9117 9135 9139 9145 9147 9343 9428 9469 9471 9633-9635 9640-9642 9761 9764 9815 9981 9983 9986 9997-9999 10146-10148 10150-10151 10156-10158 10182-10183 10187 10192 10194 10200 10202 10209 10211 10220 10224 10226 10239 10297-10299 10378 10501 10516-10518 10664 10743 10749 10872 10911 10935 10978 11080 11227 11230 11249 11252 11351 11357 11373 11375 11384 11386 11403 11406 11428 11430 11432-11434 11436 11448-11450 11524 11583 11605 11624 11626 11776 11839 11856-11858 11924-11925 12499-12500 12502 12510 12568 12782 13124-13125 13511 13522 13528 13799 13808 13810 13995 14573 14575 14584 14846-14847 14858 15188-15189 16653 16655 16664 16666 16890 17236-17237 17239 17299-17300 17302 17308 17412 17429 17472 17607 17618 17671 17677-17679 17681-17683 17697 17699 17705 17712-17713 17716-17717 17719 17762 17766 17768 17772-17773 18032 18096 18398 18601 18763 18766 18840-18841 18843 18968 19021 19023 19026-19027 19030 19036 19038 19056-19057 19060 19096-19097 19099 19397 19416 19719 19728 19846 19848-19849 19851 19861 19863 19906 19934-19935 20031 20074 20099 20657 21964 21966-21967 21971 21974 21977 22918 23465 23467 23542 23545 25134-25135 25220 25326 25334 25478 25484 25540 25669 25671 25677 25680 25682 25688 26037 26083 26086 26220 26267 26270 26289 26292-26293 26432-26433 26436 26689 26692 26787 26790 27009 27012 27239 27245 27247 27250 27262 27333 27344-27345 27393-27395 27413 27415 27720 27905 27907 27910 28032 28141 28184 28510 28529 28534-28535 28540-28541 28631 29315 29318 29795 29805 29816 29818 30029 31018-31019 31105 31113 31115 31158 31167 31210 31463 31509 31552 31964 32231 32237 32306 32404 32523 32544-32545 32607 32954 33321 33323 33917 33948 34082-34083 34088-34089 34534 35055 35381-35383 35385 35387-35390 35434 35472-35473 35475-35478 35481 35490 35496 35512 35525 35536 35538 35926-35927 35929 35931 35953 36063 36070 36104 36106 36128 36130 36232 36234 36526-36527 36586 36798-36799 36974 38102 38840-38841 38846 39091 39094 39097 39631 39640 39642 40279 40321 40801 40949 41108-41109 41987 43261-43263 43876 44528-44529 44531 45633 45749 45802 46407 46418-46420 46424 46513 46860-46861 47014 47375 47386 47405 47407 47827-47828 48105 48421 48423 48434 48478 48500-48501 48947 49104https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/687/A313?format=asciiUVdefaultJ/A+A/687/A313/sourcesProperties of the 1UVA sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceVASCA catalog source namemeta.id;meta.maincharRAJ2000Center right ascension of the field (J2000)degpos.eq.ra;meta.mainDEJ2000Center declination of the field (J2000)degpos.eq.dec;meta.mainePosVisit position errorarcsecstat.error;posdoublePosXVPosition excess variance, entries for different filtersarcsec**2stat.stdevdoublePosVarPosition variance of detectionsarcsec**2stat.variance;posdoublePosCPVal[0/1] Position probability value for a constant from the chisquare teststat.fit.goodnessdoublePosRchiqPosition reduced chisquared of the constant meanstat.fit.chi2doubleCoaddSrcId? Region coadd source ID numberobs.fieldintnullableRGSrcId? Region source ID numberobs.fieldintnullableNFDsrcs? Number of field sourcesmeta.numberintnullableHR? Flux hardness ratio, only strictly simultaneous detections consideredphot.flux;arith.ratiodoublenullablee_HR? Flux hardness ratio errorstat.errordoublenullableOGrpSSIMBAD source type group in VASCAsrc.classcharOtypeSSIMBAD source typesrc.classcharMainIDSSIMBAD main IDmeta.idcharGaiaDR3? GAIA DR3 source IDmeta.idnullableWDJGAIA-EDR3-WD object name (WDJHHMMSS.ss+DDMMSS.ss)meta.idcharGFCATGFCAT object ID (GFCAT JHHMMSS.s+DDMMSS.s)meta.idcharLSPeakPval? LombScargle power probability valuestat.fit.goodnessdoublenullableLSPeakFreq? LombScargle peak frequencyd**-1em.freqdoublenullableNdetNUV? Number of detections in NUVmeta.numberintnullableNdetFUV? Number of detections in FUVmeta.numberintnullableFNUV? NUV Flux density1e-06Jyphot.flux;em.UVdoublenullableFFUV? FUV Flux density1e-06Jyphot.flux;em.UVdoublenullablee_FNUV? NUV Flux density error1e-06Jystat.errordoublenullablee_FFUV? FUV Flux density error1e-06Jystat.errordoublenullableFNUVn? NUV Flux normalised excess variancestat.variancedoublenullableFFUVn? FUV Flux normalised excess variancestat.variancedoublenullableFNUVVar? NUV Flux variance1e-12Jy**2stat.variancedoublenullableFFUVVar? FUV Flux variance1e-12Jy**2stat.variancedoublenullableFNUVCPVal? NUV Probability value for a constant flux from the chisquare teststat.fit.goodnessdoublenullableFFUVCPVal? FUV Probability value for a constant flux from the chisquare teststat.fit.goodnessdoublenullableFNUVRchiq? NUV Flux reduced chisquared of the constant meanstat.fit.chi2doublenullableFFUVRchiq? FUV Flux reduced chisquared of the constant meanstat.fit.chi2doublenullableCoaddFNUVFac? NUV Source flux divided by flux of the associated co-add sourcephot.flux;arith.ratiodoublenullableCoaddFFUVFac? FUV Source flux divided by flux of the associated co-add sourcephot.flux;arith.ratiodoublenullableCoaddFNUVdS/N? NUV Signal to noise of the flux differencestat.snrdoublenullableCoaddFFUVdS/N? FUV Signal to noise of the flux differencestat.snrdoublenullableJ/A+A/687/A313/detectProperties of detections of 1UVA sourcesFluxVisit detection flux density (for GALEX from 6 arcsec aperture radius, with aperture correction)1e-06Jyphot.flux;em.UVdoublee_FluxVisit detection flux density error1e-06Jystat.error;phot.fluxdoubleFAppRatioFlux ratio measured at a different apertures (3.8 arcsec/6 arcsec radius for GALEX)phot.flux;arith.ratiodoubleS/NSignal to noisestat.snrdoubleRFOVDistance from center of FOV in degreesdegpos.angDistancedoubleArtifactsLogical OR of artifact flagsmeta.codeintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVisitVisit ID numbermeta.id;obsFDSrcIdSource ID associated to the visit detectionmeta.id;meta.mainintRAJ2000Center right ascension of the field (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Center declination of the field (J2000)degpos.eq.dec;meta.mainindexedePosVisit position errorarcsecstat.error;posdoubleClassStar[0/1] Point-source probability (1)stat.fit.goodnessdoubleChkObjTypeDetection matched to a known star (2)meta.codeintSizeWorldMean RMS of the ellipse size (major axis + minor axis) / 2arcsecphys.size.radiusdoubleEllWorldEllipticity of the detection or sourcesrc.ellipticitydoubleFluxAutoFlux from SExtractor auto optionJyphot.flux;em.UVdoublee_FluxAutoFlux error from a fixed circular aperture (3.8 arcsec radius for GALEX)Jystat.errordoubleRGSrcIdRegion source ID numberobs.fieldintFilterFilter of the observation (e.g. NUV)obs.param;obscharJ/A+A/687/A313/fieldsProperties of the analysed fieldsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldIDField source ID numbermeta.id;obs.fieldcharFieldNameField namemeta.idcharProjectField project, typically survey namemeta.id;obscharRAJ2000Center right ascension of the field (J2000)degpos.eq.ra;meta.mainDEJ2000Center declination of the field (J2000)degpos.eq.dec;meta.mainObservatoryTelescope of the observation (e.g. GALEX)meta.id;instr.obstycharFilterFilter of the observation (e.g. NUV)obs.param;obscharFOVDiamField radius or box size (depending on the observatory)degphys.angSizefloatNvisTotal number of visits of the fieldmeta.numberintTimeBinSizeSumTotal exposure timestime.duration;obs.exposuredoubleTimeStartVisit exposure start date and time in MJDdtime.start;obs.exposuredoubleTimeStopEnd time of last exposure in MJDdtime.epochdoubleJ/A+A/687/A313/visitsProperties of the analysed visitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVisitVisit ID numbermeta.id;meta.mainTimeBinStartVisit exposure start date and time in MJDdtime.start;obs.exposuredoubleTimeBinSizeVisit exposure time in sstime.duration;obs.exposurefloatFilter[1/3] Observation filter, 1=NUV, 2=FUV, 3=bothobs.param;obsintJ/A+A/687/A313/coaddsrcProperties of the co-add sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Center right ascension of the field (J2000)degpos.eq.ra;meta.mainDEJ2000Center declination of the field (J2000)degpos.eq.dec;meta.mainePosVisit position errorarcsecstat.error;posdoubleCoaddSrcIdRegion coadd source ID numbermeta.id;meta.mainintRGSrcIdRegion source ID numberobs.fieldintNdetNUV? Number of detections in NUVmeta.numberintnullableNdetFUV? Number of detections in FUVmeta.numberintnullableFNUV? NUV flux density1e-06Jyphot.flux;em.UVdoublenullableFFUV? FUV flux density1e-06Jyphot.flux;em.UVdoublenullablee_FNUV? NUV flux density error1e-06Jystat.errordoublenullablee_FFUV? FUV flux density error1e-06Jystat.errordoublenullable