J/MNRAS/515/256ivo://CDS.VizieR/J/MNRAS/515/256doi:10.26093/cds/vizier.75150256CDSPomakov V.P.O'Sullivan S.P.Brueggen M.Vazza F.Carretti E.,Heald G.H.Horellou C.Shimwell T.Shulevski A.Vernstrom T.2024-08-22T20:16:02Z2022-08-02T07:28:05ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-sourcespolarimetryFaraday rotation studies of distant radio sources can constrain the evolution and the origin of cosmic magnetism. We use data from the LOFAR Two-Metre Sky Survey: Data Release 2 (LoTSS DR2) to study the dependence of the Faraday rotation measure (RM) on redshift. By focusing on radio sources that are close in terms of their projection on the sky, but physically unrelated ('random pairs'), we measure the RM difference, {Delta}RM, between the two sources. Thus, we isolate the extragalactic contribution to {Delta}RM from other contributions. We present a statistical analysis of the resulting sample of random pairs and find a median absolute RM difference |{Delta}RM|=(1.79+/-0.09)rad/m^2^, with |{Delta}RM| uncorrelated both with respect to the redshift difference of the pair and the redshift of the nearer source, and a median excess of random pairs over physical pairs of (1.65+/-0.10)rad/m^2^. We seek to reproduce this result with Monte Carlo simulations assuming a non-vanishing seed cosmological magnetic field and a redshift evolution of the comoving magnetic field strength that varies as (1+z)^-gamma^. We find the best-fitting results B0=Bcomoving(z=0)<~(2.0+/-0.2)nG and gamma <~4.5+/-0.2 that we conservatively quote as upper limits due to an unmodelled but non-vanishing contribution of local environments to the RM difference. A comparison with cosmological simulations shows our results to be incompatible with primordial magnetogenesis scenarios with uniform seed fields of order nG.2022MNRAS.515..256Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/515/256CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/659/A1 : LOFAR Two-metre Sky Survey (LoTSS) DR2 (Shimwell+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/515/256https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/515/256http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/515/256https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/515/256https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/515/256http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/515/256GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/515/256/rmpairs (Coordinates, RM, redshift and angular separation of all sources in the sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/515/256/rmpairs?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/515/256/rmpairs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/515/256/rmpairs?GETtext/xml+votable180.050000true7.273178329.70173050.0055555555555555566/694 2074 2081 2085 2087 2093 2105 2107 2109 2140 2151 2212 2220 2313 2658 4606 4860 4945 4950-4951 4958-4959 4970 4977 4988 5009 5018 5052 5058-5059 5061 5072 5075 5078 5111 5180 5203 5209 5237 5246 5260 5284 5293 5297 5305 5307 5313 5329 5331 5351-5352 5364 5371 5388 5396 5415 5445 5457 5473 5489 5507 5539 5545 5553 5558 5571 5592 5666 5671 5694 5717 5725 5731 5736 5747-5748 5750 5773 5785 5796 5809 5811 5821 5826 5842 5855 5878 5887 5916 5929-5930 5945 5950-5951 5971 5987 5992-5993 5996 6007 6016 6018 6027 6037 6043-6044 6046 6070 6075-6076 6085 6107 6112 6114 6126 6219 6241-6242 6252 6362 6390 6398 6401 6438 6442 6460 6472 6477 6489 6492 6504 6507 6518 6528 6549 6551 6567 7174 7221 7235 7238 7260-7261 7265 7273 7280 7356 7363 7383 7386 7419 7464 7475 7484 7494 7501 7530 7565 7567 7580 7590 7703 7758 7774 7780 7783 7794 7938 7944 7946 9022-9023 9085-9086 9115 9123 9128 9162 9181 9188 9191 9196-9197 9200 9202 9208 9210 9278 9322 9330 9364 9396 9402 9407 9463 9497 9517 9555 9577 9601 9634 9696 9801 9809 9811 9851 9867 9915-9916 9928 9956 9964 9981 10000 10033 10118 10136 10170 10300 10302 10307 10323 10328-10330 10346 10352 10455 10459 10477 10524 10531 10546 10588 10597 10608 10624 10634 10657 10675 10686 10707 10718 10740 10745-10746 10751 10777-10778 10780 10798 10800 10804 10814 10837 10840 10859 10880 10890 10933 10935 10945 10947 10951 10957-10958 10972 10976 10995 11010 11012-11013 11016 11024 11028 11031-11032 11064 11066 11069 11072-11074 11078 11114 11116 11127 11133 11149 11151 11160 11168 11171 11191 11204 11220-11222 11233-11234 11260 11265 11282 11343 11367 11379 11389 11417-11418 11425-11426 11430 11440 11450 11459-11460 11620 11658 11787 11792 11794 11804 11825 11828 11837 11839 11848 11858 11861 11905 11909 12663 14998 15013 19452 19892 19896 19938 20090 20121 20184 20207 20218 20258 20268 20276 20312 20327 20382 28151 28530 28536 28593 28617 28619 28660 28671 32671 32691 32696 32729https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/515/256?format=asciiRadiodefaultJ/MNRAS/515/256/rmpairsCoordinates, RM, redshift and angular separation of all sources in the samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1Right ascension of source 1 in pair (J2000)degpos.eq.ra;meta.mainDE1Declination of source 1 in pair (J2000)degpos.eq.dec;meta.mainRM1Faraday rotation measure of source 1 in pairrad.m**-2physdoublee_RM1Faraday rotation measure uncertainty (1)rad.m**-2stat.errorfloatRRM1Residual rotation measure of source 1 in pair (2)rad.m**-2stat.fit.residualfloatGRM1Galactic rotation measure of source 1 in pairrad.m**-2phys.polarization.rotMeasuredoublee_GRM1Galactic rotation measure uncertaintyrad.m**-2stat.errorfloatz1Redshift of source 1 in pairsrc.redshiftdoublen_z1[0/1] 0: Photometric redshift, 1: spectroscopic redshiftmeta.noteintID1Unique identifier of source 1 in pairmeta.idintRA2degRight ascension of source 2 in pair (J2000)degpos.eq.raDE2degDeclination of source 2 in pair (J2000)degpos.eq.decRM2Faraday rotation measure of source 2 in pairrad.m**-2phys.polarization.rotMeasuredoublee_RM2Faraday rotation measure uncertainty (1)rad.m**-2stat.errorfloatRRM2Residual rotation measure of source 2 in pair (2)rad.m**-2stat.fit.residual;phys.polarization.rotMeasurefloatGRM2Galactic rotation measure of source 2 in pairrad.m**-2phys.polarization.rotMeasuredoublee_GRM2Galactic rotation measure uncertaintyrad.m**-2stat.errorfloatz2Redshift of source 2 in pairsrc.redshiftdoublen_z2[0/1] 0: Photometric redshift, 1: spectroscopic redshiftmeta.noteintID2Unique identifier of source 2 in pairmeta.idintRandPhys[0/1] Pair type identifier. 0: random pair, 1: physical pairmeta.codeintSepAngular separation between pairsarcsecpos.angDistancefloat