J/MNRAS/462/4371ivo://CDS.VizieR/J/MNRAS/462/4371doi:10.26093/cds/vizier.74624371CDSIsrael G.L.Esposito P.Rodriguez Castillo G.A.Sidoli L.2024-08-16T20:18:49Z2018-06-11T15:35:17ZCDS support team

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

cds-question@unistra.frx-ray-binary-starspulsarsWe report on the discovery of 41 new pulsating sources in the data of the Chandra Advanced CCD Imaging Spectrometer, which is sensitive to X-ray photons in the 0.3-10 keV band. The archival data of the first 15 yr of Chandra observations were retrieved and analysed by means of fast Fourier transforms, employing a peak-detection algorithm able to screen candidate signals in an automatic fashion. We carried out the search for new X-ray pulsators in light curves with more than 50 photons, for a total of about 190000 light curves out of about 430000 extracted. With these numbers, the ChAndra Timing Survey at Brera And Roma astronomical observatories (CATS @ BAR) - as we called the project - represents the largest ever systematic search for coherent signals in the classic X-ray band. More than 50 per cent of the signals were confirmed by further Chandra (for those sources with two or more pointings), XMM-Newton or ROSAT data. The period distribution of the new X-ray pulsators above ~2000s resembles that of cataclysmic variables, while there is a paucity of sources with shorter period and low fluxes. Since there is not an obvious bias against these detections, a possible interpretation is in terms of a magnetic gating mechanism in accreting neutron stars. Finally, we note that CATS @ BAR is a living project and the detection algorithm will continue to be routinely applied to the new Chandra data as they become public. Based on the results obtained so far, we expect to discover about three new pulsators every year.2016MNRAS.462.4371Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/462/4371CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012)http://www.oa-roma.inaf.it/HEAG/catsatbar : CATS catalog Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/462/4371https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/462/4371http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/462/4371https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/462/4371https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/462/4371http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/462/4371GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/462/4371/table1 (*CATS catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/462/4371/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/462/4371/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/462/4371/table1?GETtext/xml+votable180.050000true6.06625-72.0767780.0055555555555555566/3256 10905 11596 13209 13855 14443 15663 15683 28794 28816 28827 28830 28869 28899 29113 29162 29257 29259 29868 30259 30618-30619 33295 33317 33321 34052 35536 37003 37841 37926 37937 41586 41613 41847 42076 42196 42224 42394 42491 42841 44356 47755https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/462/4371?format=asciiX-rayRadiodefaultJ/MNRAS/462/4371/table1*CATS catalogueFlag[* ] Flags (3)meta.code.errorcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainGLATGalactic latitudearcminpos.galactic.latfloate_Perrms uncertainty on Per (90% confidence level)sstat.errordoubleFlux? XMM flux (0.5-10keV) or lower limit of XXM flux interval (4)1e-16W.m**-2phot.flux;em.X-rayfloatnullableFlux2? Upper limit of XXM flux ((0.5-10keV) interval (4)1e-16W.m**-2phot.flux;em.X-rayfloatnullableComComments (6)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the source (2)meta.id;meta.maincharPerPeriod of the detected signalstime.perioddoubleNXNumber of useful XMM pointings used to evaluate the signal/source parameters (5)meta.numbercharn_Name[*] Note on Name (1)meta.notecharNCNumber of useful Chandra pointings used to evaluate the signal/source parameters (5)meta.numberchar