J/A+A/548/A99ivo://CDS.VizieR/J/A+A/548/A99doi:10.26093/cds/vizier.35480099CDSWarwick R.S.Saxton R.D.Read A.M.2017-12-07T07:27:48Z2012-11-29T14:21:44ZCDS support team

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

cds-question@unistra.frsurveysgalaxiescatalogsactive-galactic-nucleix-ray-sourcesThe on-going XMM-Newton Slew Survey (XSS) provides coverage of a significant fraction of the sky in a broad X-ray bandpass. Although shallow by contemporary standards, in the "classical" 2-10keV band of X-ray astronomy, the XSS provides significantly better sensitivity than any currently available all-sky survey. We investigate the source content of the XSS, focussing on detections in the hard 2-10keV band down to a very low threshold (>=4counts net of background). At the faint end, the survey reaches a flux sensitivity of roughly 3x10^-12^erg/cm^2^/s (2-10keV). Our starting point was a sample of 487 sources detected in the XSS (up to and including release XMMSL1d2) at high galactic latitude in the hard band. Through cross-correlation with published source catalogues from surveys spanning the electromagnetic spectrum from radio through to gamma-rays, we find that 45% of the sources have likely identifications with normal/active galaxies. A further 18% are associated with other classes of X-ray object (nearby coronally active stars, accreting binaries, clusters of galaxies), leaving 37% of the XSS sources with no current identification. We go on to define an XSS extragalactic sample comprised of 219 galaxies and active galaxies selected in the XSS hard band. We investigate the properties of this extragalactic sample including its X-ray logN-logS distribution. We find that in the low-count limit, the XSS is, as expected, strongly affected by Eddington bias. There is also a very strong bias in the XSS against the detection of extended sources, most notably clusters of galaxies. A significant fraction of the detections at and around the low-count limit may be spurious. Nevertheless, it is possible to use the XSS to extract a reasonably robust sample of extragalactic sources, excluding galaxy clusters. The differential logN-logS relation of these extragalactic sources matches very well to the HEAO-1 A2 all-sky survey measurements at bright fluxes and to the 2XMM source counts at the faint end. The substantial sky coverage afforded by the XSS makes this survey a valuable resource for studying X-ray bright source samples, including those selected specifically in the hard 2-10keV band.2012A&A...548A..99Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/548/A99CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2012)J/A+A/480/611 : XMM-Newton Slew Survey catalogue, XMMSL1 (Saxton+, 2008)J/MNRAS/412/1853 : XMM Slew Survey unidentified X-ray sources (Starling+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/548/A99https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/548/A99http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/548/A99https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/548/A99https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/548/A99http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/548/A99GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/548/A99/tablea1 (XSS extragalactic sample parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/548/A99/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/548/A99/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/548/A99/tablea1?GETtext/xml+votable180.050000true0.610053.351960.0055555555555555566/615 1090 1121 2221 2231 2621 2764 3556 4019 4121 4134 4290 4439 4540 5249 5423 5483 6096 6181 6240 6364 6583 6713 7038 7321 7539 7548 7606 8299 8889 9005 9018 9104 9495 9660 9721 9723 10035 10141 10265 10269 10373 10431 10656 10662 10707 10847 11319 11352 11388 11449 11533 11582 11705 11712 11743 11754 11898 12002 12047 12231 12254 12380 12888 13096 13098 13179 14858 14976 15103 15154 15156 15218 15280 15894 16218 16333 16533 17052 17134 17814 17845 18277 18624 18661 18822 19097 19167 19400 19405 19469 19873 20192 20201 20456 20624 21450 21764 22355 22396 22549 22851 23203 24170 24848 25047 25054 25661 25735 25760 25763 26131 26238 26300 27259 27382 27699 27767 27976 28060 28259 28374 28432 28517 28629 28639 29795 31092 31120 31663 32261 32345 32353 32658 32693 33000 33038 33140 33164 33239 33716 33795 33880 33930 33953 33958 34104 34370 34414 34881 34909 34913 35071 35076 35231 35356 36015 36256 36662 36775 36890 36973 37458 37475 37568 37613 37636 38329 38481 38733 38817 38944 39058 39182 39459 39658 40167 40251 40353 40838 40870 41072 41187 41231 43401 43412 43463 43506 43630 43806 43860 44289 44507 44551 44820 45024 45693 45738 45757 46055 46280 46544 46615 46924 47016 47027 47047 47101 47154 47253 48491 48910 48929 48972https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/548/A99?format=asciiX-raydefaultJ/A+A/548/A99/tablea1XSS extragalactic sample parametersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXMMSL1SLEW XSS identifier (JHHMMSS.s+DDMMSS)meta.id;meta.maincharSoft[0/1] Detected in soft band? (1=yes, 0=no)meta.codeintFluxFlux in 2-10keV bands (10^-11^erg/cm2/s)1e-14W.m**-2phot.flux;em.X-rayfloate_FluxError on Flux1e-14W.m**-2stat.error;phot.fluxfloatRAJ2000Right ascension of counterpart (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of counterpart (J2000)degpos.eq.dec;meta.mainIDName of counterpartmeta.id.assoccharTypeType of counterpart (1)src.classcharz? Redshift of counterpartsrc.redshiftdoublenullable