J/MNRAS/533/4068ivo://CDS.VizieR/J/MNRAS/533/4068doi:10.26093/cds/vizier.75334068CDSAnderson C.S.McClure-Griffiths N.M.Rudnick L.Gaensler B.M.,O'Sullivan S.P.Bradbury S.Akahori T.Baidoo L.Bruggen M.,Carretti E.Duchesne S.Heald G.Jung S.L.Kaczmarek J.Leahy D.,Loi F.Ma Y.K.Osinga E.Seta A.Stuardi C.Thomson A.J.M.,Van Eck C.Vernstrom T.West J.2025-02-24T20:16:54Z2024-12-24T10:36:51ZCDS support team

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

cds-question@unistra.frgalaxy-groupsradio-galaxiesmagnetic-fieldspolarimetryWe present initial results from the Polarisation Sky Survey of the Universe's Magnetism (POSSUM), analyzing 22817 Faraday Rotation Measures (RMs) with median uncertainties of 1.2rad/m^2^ across 1520 square degrees to study magnetized gas associated with 55 nearby galaxy groups (z~0.025) with halo masses between 10^12.5^ and 10^14.0^M_{sun}_. We identify two distinct gas phases: the Intragroup Medium (IGrM) within 0-2 splashback radii and the Warm-Hot Intergalactic Medium (WHIM) extending from 2 to 7 splashback radii. These phases enhance the standard deviation of residual (i.e., Galactic foreground RM-subtracted) RMs by 6.9+/-1.8rad/m^2^ and 4.2+/-1.2rad/m^2^, respectively. Estimated magnetic field strengths are several uG within the IGrM and 0.1-1uG in the WHIM. Our findings indicate that 'missing baryons' in the WHIM likely extend beyond the gravitational radii of group-mass halos to Mpc scales, consistent with large-scale, outflow-driven 'magnetized bubbles' seen in cosmological simulations. We demonstrate that RM grids are an effective method for detecting magnetized thermal gas at galaxy group interfaces and within the cosmic web. This approach complements X-ray and Sunyaev-Zel'dovich effect methods, and when combined with Fast Radio Burst Dispersion Measures, data from the full POSSUM survey - comprising approximately a million RMs - will allow direct magnetic field measurements to further our understanding of baryon circulation in these environments and the magnetised universe.2024MNRAS.533.4068Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/533/4068CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/533/4068https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/533/4068http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/533/4068https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/533/4068https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/533/4068http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/533/4068GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/533/4068/table (POSSUM Rotation Measure (RM) measurement)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/533/4068/table?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/533/4068/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/533/4068/table?GETtext/xml+votable180.050000true201.5925293488965-19.92918968818970.0055555555555555563/548 4/1093 1105 2063 2102-2103 2105-2107 2200-2201 2272 2298 2763 2847 5/4416-4418 4432 4434 6229 6409 8296 8324 8326 8332 8341-8343 8345 8347-8350 8381-8383 8397-8399 8402-8403 8407 8417-8419 8441-8443 8446 8455 8459-8460 8480 8506-8507 8510 8578 8581-8584 8592-8594 8725 8727 8733 8735 8749-8751 8757 8759 8765 8784-8786 8812 8816 8836 8861-8863 8881-8886 8889 8898-8899 8904-8906 8919 9002 9096 9151 9187 9196 9198-9199 10965 10981 10983 11049 11144 11387 11472-11473 11476-11477 11497 11554-11555 11560 11562 11789-11791 11794 11800 11802 11812-11813 6/17477 17479 17485 17524-17525 17676-17677 17696 17713 17716-17717 17719 17732 17734 17740 17760 24925 32954-32955 32958 32986-32987 32990 32997 32999 33005 33190 33192 33194 33237-33239 33241 33244-33245 33285 33287 33293 33295 33300 33302 33308 33310-33311 33317 33319 33325 33332-33334 33336-33337 33358-33359 33361 33363 33379 33385 33404-33406 33477 33488 33503 33521 33523 33546 33565 33567-33568 33570 33583 33587 33603 33606-33607 33624 33626-33627 33667 33728-33730 33733 33743-33745 33748-33749 33760 33762-33763 33776 33778-33779 33788 33790 33813 33815 33819 33831 33835 33844-33846 33848-33850 33858-33859 33862 33864-33866 33924-33926 33928-33929 33982-33983 34022 34306 34318 34323 34340-34342 34344-34346 34357 34380 34382 34384-34385 34400 34897 34899 34907 34929 34931 34937 34974-34975 34995 35025 35027 35033 35035 35042 35048 35050 35148 35150 35152-35154 35168-35170 35176 35178-35179 35232-35234 35237 35252 35254 35272-35273 35327 35348-35350 35353 35421-35423 35437 35439 35441-35443 35521-35523 35548-35549 35553 35568-35570 35586-35587 35590 35610 35628 35630 35632 35634 35667 35669-35671 35673 35675 35700-35701 35703 35712-35713 36012 36014-36015 36368 36370 36376 36388 36597-36599 36601-36603 36742-36743 36745-36747 36760 36762-36763 36788 36790-36791 36840 36842-36843 43519 43834-43835 43874 43895 43909 43920-43922 43976 43978 44031 44175 44184 44186-44187 44190-44191 44195 44201-44202 44204-44205 44207 44256 44258 44264 44544-44546 44561 44564 44580 44714 45517 45519 45528 45530-45531 45534-45535 45541-45543 45545-45547 45819 45897 45900-45901 45912-45913 45996-45998 46211-46212 46214-46215 46244-46246 46252 46592 47135 47151 47155 47185 47187-47188 47190 47196 47237 47256-47257 47259-47262 47296-47298https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/533/4068?format=asciiRadiodefaultJ/MNRAS/533/4068/tablePOSSUM Rotation Measure (RM) measurementrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of RM source (J2000) (RAdeg)degpos.eq.ra;meta.mainindexedDEJ2000Declination of RM source (J2000) (DEdeg)degpos.eq.dec;meta.mainindexedSBIDASKAP Telescope Scheduling Block ID (sbid)meta.id;obsintpeakRMPeak RM (peak_RM_radmm)rad.m**-2phys.polarization.rotMeasuredoublee_peakRMError in Peak RM (peak_RM_err_radmm)rad.m**-2stat.errordoublepeakRMcPeak RM with foreground scalar correction (peak_RM_foreground_corrected_radmm)rad.m**-2phys.polarization.rotMeasuredoublepeakRMforPeak RM with surrounding foreground scalar (peak_RM_foreground_estimate_radmm)rad.m**-2phys.polarization.rotMeasuredoubleIpeakStokes I peak flux density (stokes_I_peak_flux_density_mJy)mJyphys.polarization.stokesdoublee_IpeakStokes I peak flux density (stokes_I_peak_flux_density_err_mJy)mJystat.errorfloatPIPolarised intensity (pol_int_mJy)mJyphot.flux.densitydoublee_PIError in polarised intensity (pol_int_err_mJy)mJystat.errordoublepolsnrSignal-to-noise ratio of polarised intensity (pol_snr)stat.snrdoubleRAndegRight Ascension of nearest group (nearest_group_ra_deg)degpos.eq.raDEndegDeclination of nearest group (nearest_group_dec_deg)degpos.eq.decTnestIDTully NEST ID (tully_nest_ID)meta.idintMKnestIDMK NEST ID (MK_nest_ID)meta.idcharnearr2tMPhysical size of splashback radius region (nearest_group_r_2t_Mpc)Mpcphys.size.radius;obs.fielddoublenearbFiducial scaled impact parameter to nearest group member (nearest_group_scaled_impact_parameter)src.impactParam;pos.lgdoublenearr2tdAngular size of splashback radius region (nearest_group_angular_r_2t_degs)degphys.angSize;obs.fielddoublenearDistDistance to nearest group from Earth (nearest_group_dist_from_earth_Mpc)Mpcpos.distancedoublenearRVcmbCMB-relative velocity of nearest group (nearest_group_cmb_relative_velocity_km_per_sec)km/sspect.dopplerVeloc;pos.lgfloatnearMMass of nearest group (nearest_group_nest_mass_Msol)solMassphys.massdoublenearNmembNumber of members in the nearest group (nearest_group_number_of_members)meta.numberfloat