J/ApJS/145/329ivo://CDS.VizieR/J/ApJS/145/329doi:10.26093/cds/vizier.21450329CDSHeiles C.Troland T.H.2017-06-20T13:16:42Z2007-10-08T11:24:17ZCDS support team

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

cds-question@unistra.frradio-astronomyinterstellar-mediumh-i-line-emissionWe review the theory of measuring spectral lines in emission/ absorption observations and apply it to a new survey of the 21-cm line against 79 continuum sources. We develop an observing technique and least-squares procedure to determine the opacity profile, the expected emission profile, and their uncertainty profiles. We discuss the radiative transfer for the two-component interstellar HI gas and use Gaussian components, separate ones for the warm and cold neutral media (WNM and CNM), as a practical implementation of a simple but physically correct model that successfully treats both simple and complicated profiles.2003ApJS..145..329Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/145/329CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/145/329https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/145/329http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/145/329https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/145/329https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/145/329http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/145/329GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/145/329/sources (Sources parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/145/329/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/145/329/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/145/329/sources?GETtext/xml+votable180.050000true10.21002710.0564630.0055555555555555566/18 50 64 162 245 392 1025 1129 1137 1546 1549 4285 4324 4366 4377 4388 4649 4805 4835 5284 5311 5671 8543 8624 8812 8858 8989 9009 10355 10432 10440 13007 13120 13224 18365 19543 20099 20111 22256 22375 23167 23281 23323 23469 23476 23644 23688 23807 24023 24116 24165 24247 24278 24300 24326 24349 24506 26292 26415 27514 27532 27767 27851 28063 28185 28249 28277 28315 31080 31509 31950 32033https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/145/329?format=asciiRadiodefaultJ/ApJS/145/329/sourcesSources parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharprimaryRAB1950Right Ascension in decimal hours (B1950)degpos.eq.ra;meta.mainDEB1950Declination in decimal degrees (B1950)degpos.eq.dec;meta.mainTaSource antenna temperatureKphot.antennaTempdoubleSpDisplay the spectrum (from table1)meta.ref.urlcharFitDisplay the fits parameters (from table2)meta.ref.urlchar_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/ApJS/145/329/table2Table of Gaussian Fit ParametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTpeakComponent intrinsic peak brightness temperature (1)Kphys.temperature;stat.maxfloate_Tpeak? Error in TpeakKstat.errorfloatnullabletau? Component central opacity (2)phys.absorption.coefffloatnullablee_tau? Error in taustat.errorfloatnullableVLSRCentral Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSRError in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatDelVGaussian Full-Width of Half-Maximumkm/sspect.line.widthfloate_DelVError in DelVkm/sstat.errorfloatTspin? Spin temperature (3)Kphys.temperaturefloatnullablee_Tspin? Error in TspinKstat.errorfloatnullableTkmaxComponent kinetic temperature (4)Kphys.temperatureintNHIThe H I column density (5)1e+20cm**-2phys.columnDensityfloatCNM? Cold neutral medium (CNM) component order (6)stat.fit.paramintnullableFrac? Warm neutral medium (WNM) component weighted fraction average (6)stat.fit.paramfloatnullablee_Frac? Error in Fracstat.errorfloatnullableNameSource name (7)meta.id;meta.maincharJ/ApJS/145/329/table1Derived spectra for all sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharChVelChannel velocitykm/sphys.velocfloatEProfExpected profile (antenna temperature at source position) (1)Kspect.line.profiledoubledTa/daDerivative of Ta with respect to right ascension in Kelvins per great-circle arcminuteK/arcminstat.fit.paramfloatdTa/ddDerivative of Ta with respect to declination in Kelvins per arcminuteK/arcminstat.fit.paramfloatd2Ta/da2? Second derivative of Ta with respect to right ascension in Kelvins per arcminute^2^ (2)K.arcmin**-2stat.fit.paramfloatnullabled2Ta/dadd? Second derivative of Ta with respect to right ascension and declination in Kelvins per arcminute^2^ (2)K.arcmin**-2stat.fit.paramfloatnullabled2Ta/dd2? Second derivative of Ta with respect to declination in Kelvins per arcminute^2^ (2)K.arcmin**-2stat.fit.paramfloatnullableOProfThe opacity profile (exp^-tau^)phys.absorption.coeffdouble