J/A+A/661/A8ivo://CDS.VizieR/J/A+A/661/A8doi:10.26093/cds/vizier.36610008CDSBoller T.Schmitt J.H.M.M.Buchner J.Freyberg M.Georgakakis A.,Liu T.Robrade J.Merloni A.Nandra K.Malyali A.Krumpe M.,Salvato M.Dwelly T.2022-09-19T07:43:58Z2022-05-18T13:41:55ZCDS support team

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

cds-question@unistra.frsurveysx-ray-sourcesstellar-flaresactive-galactic-nucleiThe 140 square degree Final Equatorial-Depth Survey (eFEDS) field, observed with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) aboard the Spectrum-Roentgen-Gamma (SRG) mission, provides a first look at the variable eROSITA sky. We analyze the intrinsic X-ray variability of the eFEDS sources, provide X-ray light curves and tables with variability test results in the 0.2-2.3keV (soft) and 2.3-5.0keV (hard) bands. We perform variability tests using the normalized excess variance and maximum amplitude variability methods as performed for the 2RXS catalogue and add results from the Bayesian excess variance and the Bayesian block methods. In total 65 sources have been identified as being significantly variable in the soft band. In the hard band only one source is found to vary significantly. For the most variable sources fits to stellar flare events reveal extreme flare properties. A few highly variable AGN have also been detected. About half of the variable eFEDS sources have been detected at X-rays with eROSITA for the first time. Comparison with 2RXS and XMM observations provide variability information on timescales of years to decades.2022A&A...661A...8Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/661/A8CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/661/A1 : The eFEDS X-ray catalogs (V7.4) (Brunner+, 2022)J/A+A/661/A2 : Galaxy clusters and groups in eFEDS (Liu+, 2022)J/A+A/661/A3 : eFEDS counterparts to point-like sources (Salvato+, 2022)J/A+A/661/A4 : eFEDS optical cluster and group catalog (Klein+, 2022)J/A+A/661/A5 : The eFEDS AGN catalog (Liu+, 2022)J/A+A/661/A7 : X-ray properties of eFEDS clusters and groups (Bahar+, 2022)J/A+A/661/A10 : eFEDS galaxy clusters and groups in disguise (Bulbul+, 2022)J/A+A/661/A23 : Exoplanet X-ray irradiation & evaporation rates (Foster+, 2022)J/A+A/661/A24 : Corona-chromosphere connection (Fuhrmeister+, 2022)J/A+A/661/A29 : First eROSITA study of nearby M dwarfs (Magaudda+, 2022)J/A+A/661/A34 : eta Cha cluster eROSITA X-ray scan (Robrade+, 2022)J/A+A/661/A35 : eROSITA study of 47 Tuc globular cluster (Saeedi+, 2022)J/A+A/661/A38 : SRG/ART-XC 1st year all-sky X-ray survey (Pavlinsky+, 2022)J/A+A/661/A40 : eRASS1 X-ray sources Sco-Cen members (Schmitt+, 2022)J/A+A/661/A44 : A first eROSITA view of ultracool dwarfs (Stelzer+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/661/A8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/661/A8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/661/A8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/661/A8https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/661/A8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/661/A8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/661/A8/efeds_va (*Variability test results, converted from efeds_vary.fits)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/661/A8/efeds_va?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/661/A8/efeds_va?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/661/A8/efeds_va?GETtext/xml+votable180.050000true144.25383285520851.09592040906240.0055555555555555564/256 1365 1367 1706-1707 5/1028-1030 1032-1034 5457 5459 5464-5465 5493 6818-6820 6822-6823 6834 6840-6842 10238-10239 6/4124-4126 4140-4141 4144 4146 4160-4161 4224 4226 21827 21833-21835 21868-21869 21969 27183 27194 27269-27271 27286-27287 27342-27343 27372 27374 40947 40949-40951https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/661/A8?format=asciiX-raydefaultJ/A+A/661/A8/efeds_va*Variability test results, converted from efeds_vary.fitsnb1blocks? Number of Bayesian blocks in energy band 1 (nbblocks_1)meta.numberfloatnullablebb1det[0/1] Variability flag of Bayesian blocks in energy band 1: 1=true, 0=False (bb_det_1)meta.code;src.varintbexvar1? Bayesian excess variance value in energy band 1 (bexvar_scatt_1)stat.variance;instr.bandwidthfloatnullableb_bexvar1? Bayesian excess variance lower 10 per cent quantile of the posterior in energy band 1 (bexvar_scatt_lo_1)stat.variance;instr.bandwidth;stat.minfloatnullablebexvar1det[0/1] Variability flag of Bayesian excess variance in energy band 1: 1=true, 0=False (bexvar_det_1)meta.code;src.varintB_bexvar1? Bayesian excess variance upper 10 per cent quantile of the posterior in energy band 1 (bexvar_scatt_hi_1)stat.variance;instr.bandwidth;stat.maxfloatnullablebexvarrate1? Bayesian excess variance mean count rate value in energy band 1 (bexvar_rate_1)stat.variancefloatnullableisvariable0[0/1] Variability flag for the 4 tests in energy band 0: 1=true, 0=False (isvariable_0)meta.code;src.varintisvariable1[0/1] Variability flag for the 4 tests in energy band 1: 1=true, 0=False (isvariable_1)meta.code;src.varintisvariable2[0/1] Variability flag for the 4 tests in energy band 2: 1=true, 0=False (isvariable_2)meta.code;src.varintisvariable[0/1] Variability flag for all 4 tests combined: 1=true, 0=False (isvariable)meta.code;src.varintcounts0-3s[0/1] Variablity for visual inspection of the cumulative counts in band 0: below 3 sigma = 0, above 3 sigma = 1 (counts_0_3s)meta.codeintcounts1-3s[0/1] Variablity for visual inspection of the cumulative counts in band 1: below 3 sigma = 0, above 3 sigma = 1 (counts_1_3s)meta.codeintcounts2-3s[0/1] Variablity for visual inspection of the cumulative counts in band 2: below 3 sigma = 0, above 3 sigma = 1 (counts_2_3s)meta.codeintNameSource name, eFEDS JHHMMSS.s+DDMMSS (Name)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID-SRC[1/32683] Source identification number in eFEDS catalogue (SRCID)meta.idintRAc[126.24/145.66] Right ascension (ICRS) (RA_CORR)degpos.eq.ra;meta.mainindexedDEc[-2.91/5.97] Declination (ICRS) (DEC_CORR)degpos.eq.dec;meta.mainindexedndata0? Number of data point in energy band 0, 0.2-5.0keV (ndata_0)meta.idintnullableCRmean0? Mean count rate in energy band 0 (meancr_0)ct/sphot.count;em.X-raydoublenullablee_CRmean0? Count rate error of mean count rate in energy band 0 (meancr_err_0)ct/sstat.errordoublenullablenev0? Normalized excess variance value in energy band 0 (nev_0)stat.variancedoublenullablee_nev0? Error of the normalized excess variance value in energy band 0 (nev_err_0)stat.errordoublenullablenev0sig? Normalized excess variance in units of sigma in energy band 0 (nev_sig_0)stat.variancedoublenullablenev0det[0/1] Variability flag of Normalized excess variance in energy band 0: 1=true, 0=False (nev_det_0)meta.code;src.varintamplmax0? Maximum amplitude variability value in energy band 0 (ampl_max_0)src.var.amplitudedoublenullableamplmag0sig? Maximum amplitude variability in units of sigma in energy band 0 (ampl_sig_0)stat.variancedoublenullableamplmax0det[0/1] Variability flag for Maximum amplitude variability in energy band 0: 1=true, 0=False (ampl_det_0)meta.code;src.varintnb0blocks? Number of Bayesian blocks in energy band 0 (nbblocks_0)meta.numberintnullablebb0detVariability flag of Bayesian blocks in energy band 0: 1=true, 0=False (bb_det_0)meta.code;src.varintbexvar0? Bayesian excess variance value in energy band 0 (bexvar_scatt_0)stat.variance;instr.bandwidthfloatnullableb_bexvar0? Bayesian excess variance lower 10 per cent quantile of the posterior in energy band 0 (bexvar_scatt_lo_0)stat.variance;instr.bandwidth;stat.minfloatnullablebexvar0det[0/1] Variability flag of Bayesian excess variance in energy band 0: 1=true, 0=False (bexvar_det_0)meta.code;src.varintB_bexvar0? Bayesian excess variance upper 10 per cent quantile of the posterior in energy band 0 (bexvar_scatt_hi_0)stat.variance;instr.bandwidth;stat.maxfloatnullablebexvarrate0? Bayesian excess variance mean count rate value in energy band 0 (bexvar_rate_0)stat.variancefloatnullablee_bexvarrate0? Error of the Bayesian excess variance mean count rate in energy band 0 (bexvar_rate_err_0)stat.errorfloatnullablendata1? Number of data point in energy band 1, 0.2-2.3keV (ndata_1)meta.idintnullableCRmean1? Mean count rate in energy band 1 (meancr_1)ct/sphot.count;em.X-raydoublenullablee_CRmean1? Count rate error of mean count rate in energy band 1 (meancr_err_1)ct/sstat.errordoublenullablenev1? Normalized excess variance value in energy band 1 (nev_1)stat.variancedoublenullablee_nev1? Error of the normalized excess variance value in energy band 1 (nev_err_1)stat.errordoublenullablenev1sig? Normalized excess variance in units of sigma in energy band 1 (nev_sig_1)stat.variancedoublenullablenev1det[0/1] Variability flag of Normalized excess variance in energy band 1: 1=true, 0=False (nev_det_1)meta.code;src.varintamplmax1? Maximum amplitude variability value in energy band 1 (ampl_max_1)src.var.amplitudedoublenullableamplmax1sig? Maximum amplitude variability in units of sigma in energy band 1 (ampl_sig_1)stat.variancedoublenullableamplmax1det[0/1] Variability flag for Maximum amplitude variability in energy band 1: 1=true, 0=False (ampl_det_1)meta.code;src.varinte_bexvarrate1? Error of the Bayesian excess variance mean count rate in energy band 1 (bexvar_rate_err_1)stat.errorfloatnullablendata2? Number of data point in energy band 2, 2.3-5.0keV (ndata_2)meta.idintnullableCRmean2? Mean count rate in energy band 2 (meancr_2)ct/sphot.count;em.X-raydoublenullablee_CRmean2? Count rate error of mean count rate in energy band 2 (meancr_err_2)ct/sstat.errordoublenullablenev2? Normalized excess variance value in energy band 2 (nev_2)stat.variancedoublenullablee_nev2? Error of the normalized excess variance value in energy band 2 (nev_err_2)stat.errordoublenullablenev2sig? Normalized excess variance in units of sigma in energy band 2 (nev_sig_2)stat.variancedoublenullablenev2det[0/1] Variability flag of Normalized excess variance in energy band 2: 1=true, 0=False (nev_det_2)meta.code;src.varintamplmax2? Maximum amplitude variability value in energy band 2 (ampl_max_2)src.var.amplitudedoublenullableamplmax2sig? Maximum amplitude variability in units of sigma in energy band 2 (ampl_sig_2)stat.variancedoublenullableamplmax2det[0/1] Variability flag for Maximum amplitude variability in energy band 2: 1=true, 0=False (ampl_det_2)meta.code;src.varintnb2blocks? Number of Bayesian blocks in energy band 2 (nbblocks_2)meta.numberintnullablebb2det[0/1] Variability flag of Bayesian blocks in energy band 2: 1=true, 0=False (bb_det_2)meta.code;src.varintbexvar2? Bayesian excess variance value in energy band 2 (bexvar_scatt_2)stat.variance;phys.energyfloatnullableb_bexvar2? Bayesian excess variance lower 10 per cent quantile of the posterior in energy band 2 (bexvar_scatt_lo_2)stat.variance;phys.energy;stat.minfloatnullablebexvar2det[0/1] Variability flag of Bayesian excess variance in energy band 2: 1=true, 0=False (bexvar_det_2)meta.code;src.varintB_bexvar2? Bayesian excess variance upper 10 per cent quantile of the posterior in energy band 2 (bexvar_scatt_hi_2)stat.variance;phys.energy;stat.maxfloatnullablebexvarrate2? Bayesian excess variance mean count rate value in energy band 2 (bexvar_rate_2)stat.variancefloatnullablee_bexvarrate2? Error of the Bayesian excess variance mean count rate in energy band 2 (bexvar_rate_err_2)stat.errorfloatnullable