J/ApJ/749/157ivo://CDS.VizieR/J/ApJ/749/157doi:10.26093/cds/vizier.17490157CDSWakker B.P.Savage B.D.Fox A.J.Benjamin R.A.Shapiro P.R.2018-01-04T08:22:40Z2014-01-15T09:48:06ZCDS support team

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

cds-question@unistra.frspectroscopyultraviolet-astronomyinterstellar-mediummilky-way-galaxyWe present a study of the properties of the transition temperature (T~10^5^K) gas in the Milky Way corona, based on the measurements of OVI, NV, CIV, SiIV, and FeIII absorption lines seen in the far-ultraviolet spectra of 58 sight lines to extragalactic targets, obtained with the Far-Ultraviolet Spectroscopic Explorer and the Space Telescope Imaging Spectrograph. In many sight lines the Galactic absorption profiles show multiple components, which are analyzed separately. We find that the highly ionized atoms are distributed irregularly in a layer with a scale height of about 3 kpc, which rotates along with the gas in the disk, without an obvious gradient in the rotation velocity away from the Galactic plane. Within this layer the gas has randomly oriented velocities with a dispersion of 40-60km/s. On average the integrated column densities are logN(OVI)=14.3, logN(NV)=13.5, logN(CIV)=14.2, logN(SiIV)=13.6, and logN(FeIII)=14.2, with a dispersion of just 0.2 dex in each case. In sight lines around the Galactic center and Galactic north pole, all column densities are enhanced by a factor ~2, while at intermediate latitudes in the southern sky there is a deficit in N(O VI) of about a factor of two, but no deficit for the other ions.2012ApJ...749..157Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/749/157CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)VI/129 : The FUSE Observation Log (FUSE, 1999-2007)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/ApJS/182/378 : HI and OVI absorbers in nearby Universe (Wakker+, 2009)J/ApJ/702/1472 : Column densities for HI, AlIII, SiIV, CIV, OVI (Savage+, 2009)J/ApJS/176/59 : FUSE survey of OVI in the disk of the Milky Way (Bowen+, 2008)J/ApJS/168/213 : Ionization states and cooling efficiencies (Gnat+, 2007)J/ApJ/647/312 : FUSE survey of OVI in the Milky Way (Otte+, 2006)J/ApJS/163/282 : Molecular hydrogen column densities (Wakker+, 2006)J/ApJS/146/125 : O VI in the galactic halo (Savage+, 2003)J/ApJS/146/1 : O VI absorption in FUSE survey (Wakker+, 2003)J/ApJS/136/631 : IUE absorption toward 164 early-type stars (Savage+, 2001)J/ApJS/136/463 : Distances and metallicities of HVCs and IVCs (Wakker, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/749/157https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/749/157http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/749/157https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/749/157https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/749/157http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/749/157GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/749/157/table1 (Observational data (for 69 targets))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/749/157/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/749/157/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/749/157/table1?GETtext/xml+votable180.050000true149.584932.40190.0055555555555555566/5262 5306 5423 5731 6042 6087 7246 7642 7815 7859 8017 8071 8922 9194 9612 9705 10217 10269 10578 10912 10927 11217 11388 11490 11560 11668 11829 11898 12025 12380 13414 15351 16109 16671 17075 18524 18601 19283 19730 19883 22659 22890 25090 25742 25965 26148 26270 26292 26650 27023 27580 27720 27862 28060 28356 32961 33984 34881 35018 35180 35741 36105 36775 36786 38268 47014 47169 47375 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/749/157?format=asciiUVdefaultJ/ApJ/749/157/table1Observational data (for 69 targets)NameObject namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMLink to measurements for this target (table 1)meta.ref.urlcharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latStatusStatus (1)meta.notecharInstInstrument (2)meta.id;instrcharRes[6/30] Resolution (3)km/sspect.resolutionintExp[1/529] Exposure timekstime.duration;obs.exposurefloatS/NO[1/44]? OVI signal-to-noise ratiostat.snrintnullableS/NN[2/67]? NV signal-to-noise ratiostat.snrintnullableS/NC[2/35]? CIV signal-to-noise ratiostat.snrintnullableS/NSi[3/43]? SiIV signal-to-noise ratiostat.snrintnullableObsIDObservational ID numbermeta.id;obscharSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/ApJ/749/157/table2Measurements (for 57 targets)Vmin[-125/50] Lower velocity of integration (1)km/sphys.velocintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharVmax[-65/120] Upper velocity of integration (1)km/sphys.velocintIonIon (CIII, CIIIN, CIV, FeIII, NV, OVI, SIII, SiIII or SiIV)phys.atmol.ionStagecharl_Ns[<=?x] Flag on strong line (2)meta.code.errorcharNs[0/15]? log column density of strong line (3)log(cm**-2)phys.columnDensity;spect.linefloatnullablee_Ns? Statistical error in Nslog(cm**-2)stat.errorfloatnullableE_Ns? Systematic error in Nslog(cm**-2)stat.error;stat.maxfloatnullable<Vs>[-79/76]? Centroid velocity (1st moment) of strong linekm/sspect.dopplerVelocintnullablee_<Vs>[0/28]? Uncertainty in <Vs>km/sstat.errorintnullableWs[0/118]? FWHM of strong line (1.661*2nd moment) (4)km/sspect.line.widthintnullablee_Ws? Uncertainty in Wskm/sstat.errorintnullableinfo.sInformation flag on strong line (5)meta.notecharl_Nw[<=?x] Flag on weak line (2)meta.code.errorcharNw[0/15]? log column density of weak line (3)log(cm**-2)phys.columnDensity;spect.linefloatnullablee_Nw? Statistical error in Nwlog(cm**-2)stat.errorfloatnullableE_Nw? Systematic error in Nwlog(cm**-2)stat.error;stat.maxfloatnullable<Vw>[-69/74]? Centroid velocity (1st moment) of weak linekm/sspect.dopplerVelocintnullablee_<Vw>[0/13]? Uncertainty in <vW>km/sstat.errorintnullableWw[0/116]? FWHM of strong line (1.661 * 2nd moment) (4)km/sspect.line.widthintnullablee_Ww? Uncertainty in WWkm/sstat.errorintnullableinfo.wInformation flag on weak line (5)meta.notecharIon2Ion pair ratiophys.atmol.ionStagecharl_logR[<>=x] Flag on ion pair ratio (2)meta.code.errorcharlogR[-1.3/0.8]? Log of ion ratiospect.line.intensity;arith.ratiofloatnullablee_logR[0/0.3]? Uncertainty in logRstat.errorfloatnullable