J/ApJS/217/21ivo://CDS.VizieR/J/ApJS/217/21doi:10.26093/cds/vizier.22170021CDSFang T.Buote D.Bullock J.Ma R.2018-05-30T10:49:21Z2015-05-18T12:42:53ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsactive-galactic-nucleiline-intensitiesredshiftedx-ray-sourcesHighly ionized, z=0 metal absorption lines detected in the X-ray spectra of background active galactic nuclei (AGNs) provide an effective method to probe the hot (T~10^6^K) gas and its metal content in and around the Milky Way. We present an all-sky survey of the K_{alpha}_ transition of the local OVII absorption lines obtained by Voigt-profile fitting archival XMM-Newton observations. A total of 43 AGNs were selected, among which 12 are BL Lac-type AGNs, and the rest are Seyfert 1 galaxies. At above the 3{sigma} level the local OVII absorption lines were detected in 21 AGNs, among which 7 were newly discovered in this work. The sky covering fraction, defined as the ratio between the number of detections and the sample size, increases from about 40% for all targets to 100% for the brightest targets, suggesting a uniform distribution of the OVII absorbers. We correlate the line equivalent width with the Galactic coordinates and do not find any strong correlations between these quantities. Some AGNs have warm absorbers that may complicate the analysis of the local X-ray absorber since the recession velocity can be compensated by the outflow velocity, especially for nearby targets. We discuss the potential impact of warm absorbers on our analysis.2015ApJS..217...21Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/217/21CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)J/ApJ/773/92 : XMM survey of soft background III. Galactic halo (Henley+, 2013)http://asc.harvard.edu/ : Chandra X-Ray Observatory (CXC) home pagehttp://xmm.esa.int/ : XMM-Newton Science Operations Centre home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/217/21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/217/21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/217/21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/217/21https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/217/21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/217/21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/217/21/table1 (The AGN sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/217/21/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/217/21/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/217/21/table1?GETtext/xml+votable180.050000true166.1143838.208530.0055555555555555566/5423 6021 7246 7642 8299 8922 9612 10265 10605 10927 11898 13414 16301 16447 16671 17075 19283 19730 19883 20624 22890 23134 23323 25182 26131 26148 26292 27862 28356 28517 33716 34065 34881 38268 39118 43806 43877 46615 47014 47169 47375 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/217/21?format=asciiX-raydefaultJ/ApJS/217/21/table1The AGN sampleNameTarget identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType[1/2] Target type (1=BL Lac or 2=Seyfert 1)meta.code.classintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latz[0.002/0.6] Redshiftsrc.redshiftfloatNHIDickey & Lockman (1990ARA&A..28..215D) H I column density1e+20cm**-2phys.columnDensityfloatExp[29/1086] Total exposure timekstime.duration;obs.exposureintCPRE[21/14554] Counts per resolution elementphot.count;em.X-rayintlogNO[15.6/19]? Log OVII column densitylog(cm**-2)phys.columnDensityfloatnullableE_logNO[0.2/3]? Upper 1{sigma} uncertainty in logNOlog(cm**-2)stat.error;stat.maxfloatnullablee_logNO[0.3/3]? Lower 1{sigma} uncertainty in logNOlog(cm**-2)stat.errorfloatnullableb[20/300]? Doppler-b parameterkm/sstat.paramintnullableE_b[0/280]? Upper 1{sigma} uncertainty in bkm/sstat.error;stat.maxintnullablee_b[0/280]? Lower 1{sigma} uncertainty in bkm/sstat.errorintnullableVel[-120/142]? Velocity shift of line centerkm/sphys.veloc;arith.diffintnullableE_Vel[0/240]? Upper 1{sigma} uncertainty in Velkm/sstat.error;stat.maxintnullablee_Vel[0/240]? Lower 1{sigma} uncertainty in Velkm/sstat.errorintnullablel_EW1The 3{sigma} upper limit flag on EW1 (1)meta.code.errorcharEW1[5/65]? Method 1 equivalent width; in milliAngstroms unit1e-13mspect.line.eqWidthfloatnullablee_EW1[0.6/25.2]? The 1{sigma} uncertainty in EW11e-13mstat.errorfloatnullableS/N1[1/20]? Signal-to-Noise ratio from method 1 (2)stat.snrfloatnullableC[12/2567]? C-statisticstat.fit.paramintnullabledof[12/2535]? Degree of freedomstat.fit.dofintnullableEW2[5.6/61.1]? Method 2 equivalent width; in milliAngstroms unit (3)1e-13mspect.line.eqWidthfloatnullablee_EW2[0.5/30.3]? The 1{sigma} uncertainty in EW2 (3)1e-13mstat.errorfloatnullableS/N2[0.6/22]? Signal-to-Noise ratio from method 2 (2)stat.snrfloatnullableNoteAdditional note(s) (4)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar_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.decnullableindexed