J/ApJ/663/258ivo://CDS.VizieR/J/ApJ/663/258doi:10.26093/cds/vizier.16630258CDSBrown J.C.Haverkorn M.Gaensler B.M.Taylor A.R.Bizunok N.S.,McClure-Griffiths N.M.Dickey J.M.Green A.J.2009-09-27T21:29:59Z2009-09-27T21:22:31ZCDS support team

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

cds-question@unistra.frradio-sourcespolarimetryWe present new Faraday rotation measures (RMs) for 148 extragalactic radio sources behind the southern Galactic plane (253{deg}<=l<=356{deg}, |b|<=1.5{deg}), and use these data in combination with published data to probe the large-scale structure of the Milky Way's magnetic field. We show that the magnitudes of these RMs oscillate with longitude in a manner that correlates with the locations of the Galactic spiral arms. The observed pattern in RMs requires the presence of at least one large-scale magnetic reversal in the fourth Galactic quadrant, located between the Sagittarius-Carina and Scutum-Crux spiral arms. To quantitatively compare our measurements to other recent studies, we consider all available extragalactic and pulsar RMs in the region we have surveyed, and jointly fit these data to simple models in which the large-scale field follows the spiral arms.2007ApJ...663..258Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/663/258CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/6 : Polarization of extragalactic radio sources (Eichendorf+ 1980)J/ApJS/45/97 : Extragal. radio sources Faraday rot. (Simard-Normandin+ 1981)J/ApJ/642/868 : Rotation measures for 223 pulsars (Han+, 2006)J/ApJS/145/213 : Rotation measures of compact sources in CGPS (Brown+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/663/258https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/663/258http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/663/258https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/663/258https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/663/258http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/663/258GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/663/258/table1 (Rotation Measures of the SGPS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/663/258/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/663/258/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/663/258/table1?GETtext/xml+votable180.050000true124.9425-34.7013890.0055555555555555565/9431 9822 9846 6/28803 28814 37341 37366 37375 37716 37718 37719 37721 37745 37748 37749 37751 37757 37758 37840 37841 37842 37844 37849 37852 37854 37873 37875 37878 37884 37894 37895 37900 37901 37903 37904 37905 37906 37912 37914 37927 37930 38017 38025 38027 38050 38058 38400 39249 39251 39269 39277 39279 39280 39281 39375 39376 39378 41597 41631 41656 41659 41662 41669 41674 41676 41678 41679 41684 41685 41696 41759 41767 41770 41774 41778 41779 41783 41800 41801 41805 41811 41812 41817 41820 41824 41856 42158 42173 42217 42221 42229 42380 42381 42394 42396 42433 42439 42450 42451 42457 42459 42496 42497 42513 43012 43014 43015 43020 43024 43042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/663/258?format=asciiRadiodefaultJ/ApJ/663/258/table1Rotation Measures of the SGPSf_RM[d] New value of RM (3)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitude (1)degpos.galactic.lonGLATGalactic latitude (1)degpos.galactic.latfloatRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainIPeak-pixel interferometric Stokes I valuemJyphys.polarization.stokesintmFractional polarisation (2)%phys.polarizationfloatRMFaraday rotation measurerad.m**-2phys.polarization.rotMeasureinte_RMUncertainty in RMrad.m**-2stat.errorint