J/A+A/536/A84ivo://CDS.VizieR/J/A+A/536/A84doi:10.26093/cds/vizier.35360084CDSVagnetti F.Turriziani S.Trevese D.2012-04-13T17:41:38Z2012-03-27T15:51:13ZCDS support team

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

cds-question@unistra.frsurveysactive-galactic-nucleix-ray-sourcesThe X-ray variability of the active galactic nuclei (AGN) has been most often investigated with studies of individual, nearby sources, and only a few ensemble analyses have been applied to large samples in wide ranges of luminosity and redshift. We aim to determine the ensemble variability properties of two serendipitously selected AGN samples extracted from the catalogues of XMM-Newton and Swift, with redshift between ~0.2 and ~4.5, and X-ray luminosities, in the 0.5-4.5keV band, between ~10^43^erg/s and ~10^46^erg/s. We used the structure function (SF), which operates in the time domain, and allows for an ensemble analysis even when only a few observations are available for individual sources and the power spectral density (PSD) cannot be derived. The SF is also more appropriate than fractional variability and excess variance, because these parameters are biased by the duration of the monitoring time interval in the rest-frame, and therefore by cosmological time dilation.2011A&A...536A..84Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/536/A84CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/41 : XMM-Newton Serendipitous Source Cat. 2XMMi-DR3 (XMM-SSC, 2010)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)J/A+A/528/A122 : SwiftFT catalog (Puccetti+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/536/A84https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/536/A84http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/536/A84https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/536/A84https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/536/A84http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/536/A84GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/536/A84/table1 (XMM-Newton sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/536/A84/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/536/A84/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/536/A84/table1?GETtext/xml+votable180.050000true4.32-1.1236110.005555555555555556Cone search capability for table J/A+A/536/A84/table2 (Swift sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/536/A84/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/536/A84/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/536/A84/table2?GETtext/xml+votable180.050000true13.764614.13490.0055555555555555565/6814 6/1701 4323 4438-4439 4536 4653 4695 4955 4965 4992 5069 5091 5130 5305 5367 5370 5420 5423 5434 5455 5469 5471 5560 5570 5633 5726 5748 5862 5970 5976 6021 6047 6056 6069 6073 6102 6112 6251 6258 6340 6404 6977 7178 7259 7266-7267 7281 7308 7349 7424 7426 7606 8196 8224 8299 8375 8524 8526 8707 8761 8809 8922 8941 8952 8954 9036 9077 9100 9168 9231 9330 9395 9401 9436 9445 9468 9476-9477 9512 9613 9831 9959 10189-10191 10212 10255 10265 10293 10306 10312 10348 10378-10379 10400-10401 10411 10414 10484 10549 10598 10601 10604 10653 10666 10761 10763 10769 10771-10772 10841 10912 10977 10979-10980 11027 11048 11127 11230 11252-11253 11337 11347 11353 11355 11375 11382 11388 11392 11424 11434 11461 11591 11802 11829 11873 11875 11924 11936 12405 17497 17752 17754-17755 17814-17815 18062 18607 18773 18794-18795 19033 19036 19731 19996 23190-23191 23197 23209 25944 25946 25968 25991 26000 26022 26025 26037 26292 26303 27122 27127 27133 27245-27247 27462 27714 27719 27721 27742 27767 27773 27841 27860 27862 27907 27913 27936 27941 27945 27950 27973 28015 28026 28029 28075 28173 28251 28344 28346 28356 28396 28430 28492 28494 28516-28517 28534-28535 28540-28541 28628 28632 31712 32483 32486 32500 36785https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/536/A84?format=asciiX-raydefaultJ/A+A/536/A84/table1XMM-Newton samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/412] Sequential number, within the tablemeta.recordint2XMM2XMM or 2XMMi designation (JHHMMSS.s+DDMMSS)meta.id;meta.maincharzRedshiftsrc.redshiftfloatNepNumber of observation epochsmeta.numberintlogfXX-ray flux in the 0.5-4.5keV bandlog(mW.m**-2)phot.flux;em.X-rayfloatlogLXX-ray luminosity in the 0.5-4.5keV bandlog(1e-07W)phys.luminosity;em.X-rayfloatlogtminMinimum lag {tau}_min_ between any two epochs of the light curve in the source rest-framelog(d)time.intervalfloatlogtmaxMaximum lag {tau}_max_ between any two epochs of the light curve in the source rest-framelog(d)time.intervalfloat_RAPosition derived from 2XMM name (right ascension part)degpos.eq.ra;meta.main_DEPosition derived from 2XMM name (declination part)degpos.eq.dec;meta.mainJ/A+A/536/A84/table2Swift samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/27] Sequential number, within the tablemeta.recordintSWIFTFTSWIFTFT designation (JHHMMSS.s+DDMM.m)meta.id;meta.maincharzRedshiftsrc.redshiftfloatNbinNumber of time binsmeta.numberintlogfXX-ray flux in the band 0.5-4.5keVlog(mW.m**-2)phot.flux;em.X-rayfloatlogLXX-ray luminosity in the band 0.5-4.5keVlog(1e-07W)phys.luminosity;em.X-rayfloatGRBGRB fieldobs.fieldchar_RAPosition from SwiftFT (Puccetti et al. 2011, Cat. J/A+A/528/A122) (right ascension part)degpos.eq.ra;meta.main_DEPosition from SwiftFT (Puccetti et al. 2011, Cat. J/A+A/528/A122) (declination part)degpos.eq.dec;meta.main