J/ApJ/869/171ivo://CDS.VizieR/J/ApJ/869/171doi:10.26093/cds/vizier.18690171CDSTomsick J.A.Lansbury G.B.Rahoui F.Aird J.Alexander D.M.Clavel M.,Cuturilo A.Fornasini F.M.Hong J.Klindt L.Stern D.2021-09-09T08:42:55Z2020-03-04T13:11:17ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesgalaxy-planesmilky-way-galaxyastrometryThe Nuclear Spectroscopic Telescope Array (NuSTAR) serendipitous survey has already uncovered a large number of active galactic nuclei (AGNs), providing new information about the composition of the cosmic X-ray background. For AGNs off the Galactic plane, it has been possible to use existing X-ray archival data to improve source localizations, identify optical counterparts, and classify the AGNs with optical spectroscopy. However, near the Galactic plane, better X-ray positions are necessary to achieve optical or near-IR identifications due to the higher levels of source crowding. Thus, we have used observations with the Chandra X-ray Observatory to obtain the best possible X-ray positions. With eight observations, we have obtained coverage for 19 NuSTAR serendips within 12{deg} of the plane. One or two Chandra sources are detected within the error circle of 15 of the serendips, and we report on these sources and search for optical counterparts. For one source (NuSTAR J202421+3350.9), we obtained a new optical spectrum and detected the presence of hydrogen emission lines. The source is Galactic, and we argue that it is likely a cataclysmic variable. For the other sources, the Chandra positions will enable future classifications in order to place limits on faint Galactic populations, including high-mass X-ray binaries and magnetars.2018ApJ...869..171Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/869/171CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey Galactic HI (Kalberla+,2005)J/ApJ/635/214 : Chandra X-ray sources and NIR identifications (Ebisawa+, 2005)J/ApJ/749/21 : AGNs detected by 60 month Swift/BAT survey (Ajello+, 2012)J/ApJ/808/184 : NuSTAR surveys: ECDF-S catalog (Mullaney+, 2015)J/ApJ/825/132 : NuSTAR hard X-ray survey of Galactic Center. II. (Hong+, 2016)J/ApJS/223/15 : 8yr INTEGRAL/IBIS soft gamma-ray source obs. (Bird+, 2016)J/ApJ/836/99 : NuSTAR serendip. survey: the 40-month catalog (Lansbury+, 2017)J/ApJS/235/17 : NuSTAR Extragalactic Surveys: UDS field (Masini+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/869/171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/869/171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/869/171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/869/171https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/869/171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/869/171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/869/171/table1 (Chandra observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/869/171/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/869/171/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/869/171/table1?GETtext/xml+votable180.050000true306.088333.8510.005555555555555556Cone search capability for table J/ApJ/869/171/table2 (NuSTAR serendips studied in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/869/171/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/869/171/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/869/171/table2?GETtext/xml+votable180.050000true223.66539-51.589380.005555555555555556Cone search capability for table J/ApJ/869/171/table4 (Chandra candidate matches to NuSTAR serendips)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/869/171/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/869/171/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/869/171/table4?GETtext/xml+votable180.050000true223.6691667-51.58752780.005555555555555556Cone search capability for table J/ApJ/869/171/table7 (Chandra sources in NuSTAR serendip fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/869/171/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/869/171/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/869/171/table7?GETtext/xml+votable180.050000true223.6691667-51.58752780.0055555555555555566/12910 13179 13180 13182 14608 14610 29398 29404 41654 41928 41929https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/869/171?format=asciiX-raydefaultJ/ApJ/869/171/table1Chandra observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNsNumber of Chandra sources for this ObsID (link to Table 7)meta.ref.urlintnullableObsID[17245/18089] ObsID of the targetmeta.id;obsintprimaryGLON[10/322] Galactic longitude (J2000)degpos.galactic.lonGLAT[-12/12] Galactic latitude (J2000)degpos.galactic.latObsStarting (UT) date of observationstime.start;obsnullableExp[4939/28755] Exposition timestime.duration;obs.exposureint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedJ/ApJ/869/171/table2NuSTAR serendips studied in this workSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNuSTARName of the serendipitous source (JHHMMSS+DDMM.m)meta.id;meta.maincharL17Name in the L17 catalog ([PS]NNN) (1)meta.idcharRAJ2000[195/320] Degree of right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-64/34] Degree of declination (J2000)degpos.eq.dec;meta.mainMatchLink to Chandra candidates matches (Table 4)meta.ref.urlintnullableJ/ApJ/869/171/table4Chandra candidate matches to NuSTAR serendipsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsID[17245/18089] ObsID of the target (1)meta.id.part;meta.mainintSeq[1/28] Sequence number within ObsID (1)meta.id.part;meta.mainintCXOUCXOU name of the target (JHHMMSS.s+DDMMSS)meta.idcharRAJ2000Chandra Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Chandra Degree of declination (J2000)pos.eq.dec;meta.mainePos[0.7/4.3] 90% confidence uncertainty on the position (G1)sstat.error;stat.fit.paramfloatNcts[4/4142] Number of ACIS counts detected (G2)meta.numberfloate_Ncts[3/66] Ncts uncertaintystat.errorfloatL17Name in the L17 catalog ([PS]NNN) (2)meta.id.crosscharJ/ApJ/869/171/table7Chandra sources in NuSTAR serendip fieldsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMatchLink to Chandra candidates matches (Table 4)meta.ref.urlintnullableObsID[17245/18089] ObsID of the targetmeta.id.part;meta.mainintSeq[1/47] Running sequence number within ObsIDmeta.id.part;meta.mainintSep[0.09/47] Angular distance between the Chandra aimpoint and the source ({Theta})arcminpos.angDistancefloatRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainePos[0.7/8.5] Error on position (G1)arcsecstat.error;posfloatNcts[3/5213] Number of ACIS counts detected (G2)meta.numberfloate_Ncts[3/74] Ncts uncertaintystat.errorfloatOID? Other identification(s) (1)meta.id.crosschar