J/ApJ/755/21ivo://CDS.VizieR/J/ApJ/755/21doi:10.26093/cds/vizier.17550021CDSMao S.A.McClure-Griffiths N.M.Gaensler B.M.Brown J.C.van Eck C.L.,Haverkorn M.Kronberg P.P.Stil J.M.Shukurov A.Taylor A.R.2014-04-22T20:47:40Z2014-04-08T07:46:04ZCDS support team

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

cds-question@unistra.frradio-sourcesmagnetic-fieldsmilky-way-galaxypolarimetrygalaxy-planesWe present a study of the Milky Way disk and halo magnetic field, determined from observations of Faraday rotation measure (RM) toward 641 polarized extragalactic radio sources in the Galactic longitude range 100{deg}-117{deg}, within 30{deg} of the Galactic plane. For |b|<15{deg}, we observe a symmetric RM distribution about the Galactic plane. This is consistent with a disk field in the Perseus arm of even parity across the Galactic mid-plane. In the range 15{deg}<|b|<30{deg}, we find median RMs of -15+/-4rad/m2 and -62+/-5rad/m2 in the northern and southern Galactic hemispheres, respectively. If the RM distribution is a signature of the large-scale field parallel to the Galactic plane, then this suggests that the halo magnetic field toward the outer Galaxy does not reverse direction across the mid-plane. The variation of RM as a function of Galactic latitude in this longitude range is such that RMs become more negative at larger |b|. This is consistent with an azimuthal magnetic field of strength 2{mu}G (7{mu}G) at a height 0.8-2kpc above (below) the Galactic plane between the local and the Perseus spiral arm. We propose that the Milky Way could possess spiral-like halo magnetic fields similar to those observed in M51.2012ApJ...755...21Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/755/21CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VII/6 : Polarization of Extragalactic Radio Sources (Eichendorf+ 1980)J/A+A/549/A56 : Rotation Measure synthesis of WSRT obs. (Iacobelli+, 2013)J/ApJ/749/71 : Star polarization in the Galactic plane (Pavel+, 2012)J/ApJ/728/97 : VLA rotation measures in the Galactic plane (Van Eck+, 2011)J/A+A/513/A65 : RMs in the fourth Galactic quadrant (Nota+, 2010)J/ApJ/714/1170 : Faraday rotation at high Galactic latitude (Mao+, 2010)J/ApJ/702/1230 : Rotation measure image of the sky (Taylor+, 2009)J/MNRAS/386/1881 : New pulsar rotation measures (Noutsos+, 2008)J/ApJ/663/258 : RMs of extragalactic sources in SGPS (Brown+, 2007)J/ApJ/642/868 : Rotation measures for 223 pulsars (Han+, 2006)J/ApJS/145/213 : Rotation measures of compact sources in CGPS (Brown+, 2003)J/ApJS/45/97 : Extragal. Radio Sources Faraday Rot. (Simard-Normandin+ 1981)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/755/21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/755/21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/755/21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/755/21https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/755/21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/755/21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/755/21/table1 (Rotation measures of extragalactic sources from VLA observations in increasing order of Galactic longitude)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/21/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/21/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/21/table1?GETtext/xml+votable180.050000true342.2942.420.0055555555555555565/3395 3438 3440 3444 6/2688 2721 2724 2728 2733 2734 2738 2741 2746 2786 2787 2791 2796 2797 2808 2810 2813 2984 2986 2987 2991 11767 12127 12151 12158 12244 13574 13575 13584 13587 13593 13594 13597 13598 13599 13605 13606 13616 13617 13618 13620 13624 13628 13629 13632 13633 13638 13639 13640 13641 13644 13646 13651 13656 13662 13664 13665 13667 13668 13671 13672 13676 13679 13680 13682 13689 13691 13692 13694 13712 13716 13718 13719 13722 13724 13726 13733 13735 13743 13745 13746 13747 13748 13750 13751 13758 13765 13767 13768 13769 13774 13780 13787 13792 13793 13795 13796 13798 13800 13802 13803 13804 13805 13806 13809 13810 13812 13815 13816 13820 13823 14085 14087 14093 14095 14096 14097 14107 14111 14116 14117 14118 14123 14124 14125 14127 14128 14129 14131 14134 14137 14138 14145 14147 14151 14152 14153 14155 14157 14160 14163 14166 14167 14172 14173 14178 14179 14183 14184 14186 14193 14197 14211 14219 14220 14226 14228 14231 14233 14236 14237 16095 16118 16122 16123 16124 16180 16181 16185 16186 16187 16191 16225 16231 16232 16242 16261 16264 16266 16270 16272 16274 16275 16283 16284 16289 16290 16298 16305 16306 16307 16314 16316 16320 16323 16324 16326 16327 16333 16354 16355 16356 16362 20342 20347 20350 20382 20383 20390 20393 20396 20399 20410 20418 20419 20424 20425 20426 20433 20436 20438 20439 20449 20456 20457 20458 20460 20461 20464 20474 20479https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/755/21?format=asciiRadiodefaultJ/ApJ/755/21/table1Rotation measures of extragalactic sources from VLA observations in increasing order of Galactic longituderecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[0/23] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[29/84] Degree of declination (J2000)pos.eq.dec;meta.mainGLON[100.06/116.95] Galactic longitudedegpos.galactic.lonGLAT[-29.95/29.97] Galactic latitudedegpos.galactic.latfloatRM[-514/336] Rotation measurerad.m**-2phys.polarization.rotMeasureinte_RM[1/37] RM uncertaintyrad.m**-2stat.errorint