Rotation measures in radio source pairs J/ApJ/878/92 ivo://CDS.VizieR/J/ApJ/878/92 doi:10.26093/cds/vizier.18780092 CDS Vernstrom T. Gaensler B.M. Rudnick L. Andernach H. 2022-05-18T14:51:51Z 2022-03-02T15:04:36Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr radio-continuum-emission polarimetry redshifted intergalactic-medium Faraday rotation measures (RMs) of extragalactic radio sources provide information on line-of-sight magnetic fields, including contributions from our Galaxy, source environments, and the intergalactic medium (IGM). Looking at differences in RMs, {Delta}RM, between adjacent sources on the sky can help isolate these different components. In this work, we classify adjacent polarized sources in the NRAO VLA Sky Survey (NVSS) as random or physical pairs. We recompute and correct the uncertainties in the NVSS RM catalog, since these were significantly overestimated. Our sample contains 317 physical and 5111 random pairs, all with Galactic latitudes |b|>=20{deg}, polarization fractions >=2%, and angular separations between 1.5' and 20'. We find an rms {Delta}RM of 14.9+/-0.4 and 4.6+/-1.1rad/m^2^ for the random and physical pairs, respectively. This means that polarized extragalactic sources that are close on the sky but at different redshifts have larger differences in RM than two components of one source. This difference of ~10rad/m^2^ is significant at 5{sigma} and persists in different data subsamples. While there have been other statistical studies of {Delta}RM between adjacent polarized sources, this is the first unambiguous demonstration that some of this RM difference must be extragalactic, thereby providing a firm upper limit on the RM contribution of the IGM. If the {Delta}RMs originate local to the sources, then the local magnetic field difference between random sources is a factor of 2 larger than that between components of one source. Alternatively, attributing the difference in {Delta}RMs to the intervening IGM yields an upper limit on the IGM magnetic field strength of 40nG. 2019ApJ...878...92V https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/878/92 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003) VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004) VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) J/A+A/370/409 : Large angular size radio galaxies. I. (Lara+, 2001) J/ApJ/642/868 : Rotation measures for 223 pulsars (Han+, 2006) J/ApJ/702/1230 : Rotation measure image of the sky (Taylor+, 2009) J/ApJ/714/1170 : Faraday rotation at high Galactic latitude (Mao+, 2010) J/ApJS/212/15 : Polarized NVSS sources SEDs (Farnes+, 2014) J/A+A/568/A126 : SDSS-DR9 photometric redshifts (Brescia+, 2014) J/ApJS/224/18 : Identify giant radio sources from the NVSS (Proctor, 2016) J/ApJ/829/5 : S-PASS & NVSS bright extragal. radio sources (Lamee+, 2016) J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017) J/MNRAS/474/5008 : Radio spectral index 147-1400MHz (de Gasperin+, 2018) J/A+A/613/A58 : Polarized point sources in LOTSS-HETDEX (Van Eck+, 2018) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/878/92 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/878/92 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/878/92 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/878/92 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/878/92 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/878/92 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/878/92/table1 (Details of Taylor+ (2009, J/ApJ/702/1230) polarized pairs) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/878/92/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/878/92/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/878/92/table1? 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36556 36558 36572 36578-36580 36582 36592-36593 36595 36603 36605 36608 36617 36625 36628-36629 36634 36636 36638 36662 36676 36679 36692 36694-36695 36697 36705 36707 36712 36716 36718 36720 36747-36748 36761 36769 36771 36778 36803 36806 36816 36828-36829 36831 36842-36844 36855 36863 38254-38255 38261 38332 38334 38340 38369 38705 38708 38750 38759 38765 38771-38772 38777 38783 38796 38809-38810 38812 38829 38833 38838 38842-38843 38852 38872 38876 38880 38887 38898 39597 39614 39658 40206 40209 40258 40264 40289 40301 40318-40319 40325 40331-40332 40338 40372-40373 40383 40385 40389 40409 40412 40416 40432 40442-40444 40711 40724 40726 40732 40756 40759 40766 40775 40796 40807 40809 40824 40851 40885-40886 40897 40909 40912 40914 40922-40923 40931 40944 40950 43384 43389 43422 43451 43463 43469 43471-43472 43480-43481 43487 43647 43702 43717 43730 43749 43753 43769 43802 43805-43806 43816 43820 43828 43839 43846 43850 43860 43866 43870 43875 43880 43891 43914 43923 43932 43937 43947 43956-43957 43964 43973 43977 43984 43988 43994 43998 44010 44021 44025 44030 44058 44068-44069 44093 44122 44129-44130 44133 44152 44159 44162 44168 44173-44174 44201 44212 44215 44217-44218 44226 44243 44245 44260 44265 44285 44295 44297 44358 44367 44372 44383 44389 44391 44396 44405 44450-44451 44454 44473 44475 44484 44508 44518 44526 44537 44544 44549 44553 44575 44587 44590 44612 44623 44650 44657 44662 44668 44670-44671 44677 44688 44698 44710 44729 44731 44745-44746 44754 44775 44787 44827 44839-44840 44842 44845 44873 44892-44893 44897 44899 44903 44911 44917 44928 44930-44931 44933 44935 44938 44965 44971 44982 44990-44991 44993-44994 44999 45003 45006 45020 45022 45037 45041 45048 45053 46431 46458 46527 46538 46550 46570 46583 46588 46591 46715 46767 46771 46791 46801 46812 46819-46820 46826 46856 46873 46875 46883 46892 46895 46902 46909 46966 46989 46993 47008 47013 47035 47040 47058 47065 47080 47083 47092 47477 47482 47486 47543-47544 47553 47566 47571 47583 47586 47593-47595 47737 47740 47881 47896 47929 47949 47957 47999 48071 48134 48139 48141 48151 48171-48173 48187-48189 48199 48211 48217 48228 48230-48231 48233 48254-48255 48277 48280 48298 48304 48308 48310 48345 48348 48357 48359 48363 48379 48390 48398 48400 48411 48420 48426 48434 48447 48450 48483 48491 48498 48513-48514 48541-48542 48553 48558 48565-48566 48582 48587 48591 48603 48612 48614 48625 48630 48643 48649 48657 48678 48680 48685 48691-48693 48700 48705 48719 48739 48746 48769 48782 48795 48798 48803 48812 48821 48830 48847 48860 48878 48891 48899 48918 48921 48935 48947-48948 48952 48969 48985 49021 49065 49067 49080 49099 49120 49147 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/878/92?format=ascii Radio default J/ApJ/878/92/table1 Details of Taylor+ (2009, J/ApJ/702/1230) polarized pairs z1 [0/4.71]? Redshift source 1 src.redshift float nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Seq [1/5428] Pair identifier number meta.id.parent int Class Class (1) meta.code char RAJ2000 Source 1 Hour of Right Ascension (J2000) pos.eq.ra;meta.main DEJ2000 Source 1 Degree of Declination (J2000) pos.eq.dec;meta.main RA2 Source 2 Hour of Right Ascension (J2000) pos.eq.ra DE2 Source 2 Degree of Declination (J2000) pos.eq.dec Sep [1.5/20] Separation of sources in pair arcmin pos.angDistance float RM1 [-231/214] Rotation Measure of source 1 rad.m**-2 phys.polarization.rotMeasure int e_RM1 [0/22] Uncertainty of RM source 1 (2) rad.m**-2 stat.error int RM2 [-209/180] Rotation Measure of source 2 rad.m**-2 phys.polarization.rotMeasure int e_RM2 [0/21] Uncertainty of RM source 2 (2) rad.m**-2 stat.error int DelRM [-141.3/104.4] Difference in RMs (RM1-RM2) rad.m**-2 phys.polarization.rotMeasure;arith.diff float e_DelRM [0.7/28] Uncertainty of difference in RMs rad.m**-2 stat.error float P1 [2.29/337.53] Peak Polarized Intensity source 1 (3) mJy/beam spect.line.intensity;em.radio.750-1500MHz;stat.max float P2 [2.27/776.65] Peak Polarized Intensity source 2 (3) mJy/beam spect.line.intensity;em.radio.750-1500MHz;stat.max float sigQU [0.16/0.88] Average Q & U Image noise, {sigma}_QU_ (4) mJy/beam stat.fit.param float Leak1 [0.03/4.12] Leakage fraction percent source 1 % stat.fit.param float Leak2 [0.03/3.61] Leakage fraction percent source 2 % stat.fit.param float Name1 Source 1 Name (5) meta.id;meta.main char Name2 Source 2 Name (5) meta.id.assoc char fPol1 [2/44.7] Polarization fraction percent source 1 % phys.polarization float fPol2 [2/62.5] Polarization fraction percent source 2 % phys.polarization float z2 [0/3.88]? Redshift source 2 src.redshift float nullable SpInd1 [-1.37/0.9]? Spectral index source 1 spect.index float nullable SpInd2 [-1.39/1.05]? Spectral index source 2 spect.index float nullable T09 Display data from Taylor+ 2009, J/ApJ/702/1230 within 5" of the two sources meta.ref.url char