J/ApJS/151/271ivo://CDS.VizieR/J/ApJS/151/271doi:10.26093/cds/vizier.21510271CDSHeiles C.Troland T.H.2017-10-11T05:13:17Z2005-06-02T04:47:42ZCDS support team

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

cds-question@unistra.frradio-sourcespolarimetryWe outline the theory and practice of measuring the four Stokes parameters of spectral lines in emission/absorption observations. We apply these concepts to our Arecibo H I absorption line data and present the results. We include a detailed discussion of instrumental effects arising from polarized beam structure and its interaction with the spatially extended emission line structure. At Arecibo, linear polarization [Stokes (Q,U)] has much larger instrumental effects than circular (Stokes V). We show how to reduce the instrumental contributions to V and to evaluate upper limits to its remaining instrumental errors by using the (Q,U) results. These efforts work well for opacity spectra but not for emission spectra. Arecibo's large central blockage exacerbates these effects, particularly for emission profiles, and other telescopes with weaker sidelobes are not as susceptible. We present graphical results for 41 sources; we analyze these absorption spectra in terms of Gaussian components, which number 136, and present physical parameters including magnetic field for each.2004ApJS..151..271Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/151/271CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/145/329 : Millennium Arecibo 21-cm Survey (Heiles+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/151/271https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/151/271http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/151/271https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/151/271https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/151/271http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/151/271GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/151/271/table1 (Table of Gaussian Fit Parameters Having {Delta}B_{||}_<100{mu}G)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/151/271/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/151/271/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/151/271/table1?GETtext/xml+votable180.050000true68.30735.33270.0055555555555555566/18 50 162 1128 1137 4285 4366 4835 8543 8624 8989 9009 13006 13120 13224 14285 18365 19543 20099 20111 22256 23323 23469 23644 23688 24116 24165 24185 24247 24300 24326 24349 26292 27532 28063 28315 31037 31509 31949 32033https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/151/271?format=asciiRadiodefaultJ/ApJS/151/271/table1Table of Gaussian Fit Parameters Having {Delta}B_{||}_<100{mu}GNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTBComponent intrinsic peak brightnessKphys.temperaturefloattauComponent central opacityphys.absorption.coefffloate_tauError in taustat.errorfloatVLSRCentral 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.errorfloatTspinSpin TemperatureKphys.temperaturefloate_TspinError in TspinKstat.errorfloatTkmaxComponent kinetic temperatureKphys.temperatureintNHIH I column density1e+20cm**-2phys.columnDensityfloatBMagnetic field in microGauss0.1nTphys.magFieldfloate_BError in B0.1nTstat.errorfloatf_B[s] Indicates a statistically usable componentmeta.codecharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latSimbadSimbad 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.decnullableindexed