J/ApJ/714/1424ivo://CDS.VizieR/J/ApJ/714/1424doi:10.26093/cds/vizier.17141424CDSTurner M.L.Rutledge R.E.Letcavage R.Shevchuk A.S.H.Fox D.B.2017-11-06T12:23:26Z2012-05-23T12:25:49ZCDS support team

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

cds-question@unistra.frx-ray-sourcesastronomical-object-identificationpulsarsUsing new and archival observations made with the Swift satellite and other facilities, we examine 147 X-ray sources selected from the ROSAT All-Sky-Survey Bright Source Catalog (RASS/BSC) to produce a new limit on the number of isolated neutron stars (INSs) in the RASS/BSC, the most constraining such limit to date. Independent of X-ray spectrum and variability, the number of INSs is <=48 (90% confidence). Restricting attention to soft (kT_eff_<200eV), non-variable X-ray sources -as in a previous study- yields an all-sky limit of <=31 INSs. In the course of our analysis, we identify five new high-quality INS candidates for targeted follow-up observations. A future all-sky X-ray survey with eROSITA, or another mission with similar capabilities, can be expected to increase the detected population of X-ray-discovered INSs from the 8-50 in the BSC, to (for a disk population) 240-1500, which will enable a more detailed study of neutron star population models.2010ApJ...714.1424Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/714/1424CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)J/A+A/527/A139 : X-ray bursting neutron star atmosphere models (Suleimanov+,J/A+A/473/523 : Spectroscopic monitoring of 3 neutron stars (Van der Meer+,http://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/swift.pl : Swift mission archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/714/1424https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/714/1424http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/714/1424https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/714/1424https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/714/1424http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/714/1424GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/714/1424/table1 (Candidates RASS/BSC sources and identifications)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/714/1424/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/714/1424/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/714/1424/table1?GETtext/xml+votable180.050000true4.6387516.44333330.005555555555555556Cone search capability for table J/ApJ/714/1424/table2 (Objects observed and detected with Swift/XRT)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/714/1424/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/714/1424/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/714/1424/table2?GETtext/xml+votable180.050000true9.73625-3.7296390.0055555555555555566/116 280 463 687 759 814 1025 1123 1178 1286 1535 1613 2388 2623 3387 4512 4871 4875 5569 5975 6498 6529 6539 7193 7285 7454 7498 7928 8004 8163 8254 9162 9401 10163 10169 10336 10379 10497 10613 10679 10759 10773 10781 11044 11112 11389 11400 11447 11713 11860 11911 11987 12188 12379 12714 14379 14680 15368 15658 16543 16701 17139 17797 17822 17959 18450 18754 19009 19370 19383 19848 20012 20074 20084 20358 20459 20507 20681 22805 22854 22977 22979 22985 22988 22993 23473 23547 23789 23952 24103 25623 25839 26327 26678 26719 26851 27731 27762 27763 27863 27976 28005 28010 28019 28050 28638 28808 28815 28862 28925 29116 29514 31000 31185 31600 32211 34266 34516 34738 35611 35640 35850 36234 36393 36435 36492 36511 36694 38644 39384 40435 40845 40911 42366 42483 42970 42981 42984 43790 43992 43993 46572 47866https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/714/1424?format=asciiX-rayRadiodefaultJ/ApJ/714/1424/table1Candidates RASS/BSC sources and identificationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXSSource identification (JHHMMSS.s+DDMMSS)meta.id;meta.maincharprimarySSimbad column added by the CDSmeta.code;obscharPnoidThe probability P_no-id_ that each RASS/BSC X-ray source was not associated with any of the off-band catalog sources (section 2.1)stat.fit.goodnessfloatTypeSource typesrc.classcharNameAlternative Namemeta.idcharObsObservation facility (1)meta.code;obscharHRHardness ratiophot.flux;arith.ratiofloatClassObject identification ("INS", "Not an INS", or "Undetermined")meta.idcharRosatDisplay the RASS/BSC data (1RXS), Cat. IX/10meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/714/1424/table2Objects observed and detected with Swift/XRTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1RXSSource identification (JHHMMSS.s+DDMMSS)meta.id;meta.maincharObsIDSwift/XRT observation IDmeta.id;obscharXRTXRT identification (JHHMMSS.s+DDMMSS.s)meta.id.crosscharRSeparation R between RASS/BSC source and Swift sourcearcsecpos.angDistancefloatUVOTUVOT identification (JHHMMSS.s+DDMMSS.s)meta.id.crosscharPx? Log probability of chance association between UVOT and XRT sourcestat.fit.goodnessfloatnullable2MASS2MASS identification (JHHMMSS.s+DDMMSS.s)meta.id.crosscharPx2? Log probability of chance association between 2MASS and XRT sourcestat.fit.goodnessfloatnullablePU? Log probability of chance association between 2MASS and UVOT sourcestat.fit.goodnessfloatnullableUSNOUSNO identification (JHHMMSS.s+DDMMSS.s)meta.id.crosscharPxU? Log probability of chance association between USNO and XRT sourcestat.fit.goodnessfloatnullablePUU? Log probability of chance association between USNO and UVOT sourcestat.fit.goodnessfloatnullableClassObject classification ("INS", "Not an INS", or "Undetermined")meta.code.class;src.classcharf_Class[hij] Individual remarks (1)meta.codechar_RAPositions from XRT name (right ascension part)degpos.eq.ra;meta.main_DEPositions from XRT name (declination part)degpos.eq.dec;meta.main