J/ApJS/283/54ivo://CDS.VizieR/J/ApJS/283/54CDSHajizadeh H.Stil J.Plume R.Tahani M.Jagannathan P.2026-09-01T08:06:48Z2026-09-01T09:00:10ZCDS support team

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

cds-question@unistra.frpolarimetryradio-sourcesmolecular-cloudsinterstellar-mediumWe present a comprehensive radio polarization study of the Perseus molecular cloud using wideband L-band observations from the Karl G. Jansky Very Large Array. Our survey covers ~13.8deg2 with a mean Stokes I sensitivity of ~80{mu}Jy/beam, enabling the detection of 1410 compact radio sources. From this population, we construct a catalog of source properties, including positions, integrated flux densities, and spectral indices measured across nine spectral windows. The majority of sources exhibit negative spectral indices, consistent with nonthermal synchrotron emission. Using the rotation measure (RM)-based RM Synthesis and RM CLEAN techniques, we detect 205 polarized background sources above an 8{sigma} threshold. This corresponds to a sampling density of ~14.8deg^-2^, representing more than an order of magnitude increase compared to previous NVSS-based measurements. The resulting RMs exhibit coherent large-scale variations across the surveyed region, with additional small-scale structure superimposed. The enhanced sensitivity, frequency coverage, and sampling density of our observations enable a substantially improved mapping of the line-of-sight magnetic field component toward the Perseus molecular cloud compared to previous surveys.2026ApJS..283...54Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/283/54CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VI/128 : Log of CGPS exposures (Taylor+, 2003-)J/ApJ/638/293 : 1.1mm sources in the Perseus Molecular Cloud (Enoch+, 2006)J/ApJ/702/1230 : Rotation measure image of the sky (Taylor+, 2009)J/ApJ/728/97 : VLA rotation measures in the Galactic plane (Van Eck+, 2011)J/ApJ/818/73 : Study of protostars in the Perseus cloud (Tobin+, 2016)J/ApJ/818/116 : Gould's Belt VLA survey. V. Perseus region (Pech+, 2016)J/A+A/597/A98 : Faraday tomography of foreground toward IC342 (Van Eck+, 2017)J/A+A/614/A100 : Molecular clouds los magnetic field structure (Tahani+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/283/54https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/283/54http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/283/54https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/283/54https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/283/54http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/283/54GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/283/54/table1 (*The RM catalog of true Faraday rotation detections toward the Perseus cloud (updated version by the author))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/283/54/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/283/54/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/283/54/table1?GETtext/xml+votable180.050000true52.5152630.548880.005555555555555556Cone search capability for table J/ApJS/283/54/table2 (VLA L-band rotation measure catalog toward the Perseus molecular cloud)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/283/54/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/283/54/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/283/54/table2?GETtext/xml+votable180.050000true49.8494131.028690.0055555555555555565/214-215 220 6/845 847 851 854-855 884 886https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/283/54?format=asciiRadiodefaultJ/ApJS/283/54/table1*The RM catalog of true Faraday rotation detections toward the Perseus cloud (updated version by the author)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVCPMCUnique identifier for each source (JHHMMSS.s+DDMMSS) (Source_ID) (G1)meta.id;meta.maincharRMDisplay the VLA L-band rotation measure catalog for this source (link to Table 2)meta.ref.urlintnullableRAJ2000[50/54.8] Right Ascension of the source (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000[28.7/32.3] Declination of the source (J2000) (DEC)degpos.eq.dec;meta.maine_RAJ2000[0/0.005] Uncertainty in RA (E_RA)degstat.error;pos.eq.radoublee_DEJ2000[0/0.005] Uncertainty in DEC (E_DEC)degstat.error;pos.eq.decdoublealpha[-2.9/2.6]? Spectral index fitted across SPWs 1-9 (alpha)spect.indexfloatnullablee_alpha[0.02/3.3]? Uncertainty in alpha (E_alpha)stat.error;spect.indexfloatnullableStotSPW1[0.57/459]? Total integrated flux density in SPW1 (Total_S_SPW1)mJyphot.flux.density;em.radiofloatnullablee_StotSPW1[0.29/29]? Uncertainty in total integrated flux density in SPW1 (E_Total_S_SPW1)mJystat.error;phot.flux.density;em.radiofloatnullableSpkSPW1[0.8/401]? Peak flux density in SPW1 mJy/beam (Peak_S_SPW1)mJyphot.flux.density;em.radiofloatnullablee_SpkSPW1[0.2/15]? Uncertainty in peak flux density in SPW1 mJy/beam (E_Peak_S_SPW1)mJystat.error;phot.flux.density;em.radiofloatnullablermsSPW1J/ApJS/283/54/table2VLA L-band rotation measure catalog toward the Perseus molecular cloudRAJ2000[49.8/55] Right Ascension of the source (J2000)degpos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFDisplay the true Faraday rotation detection catalog for this source (link to Table 1)meta.ref.urlintnullableVCPMCUnique identifier for each source (JHHMMSS.s+DDMMSS) (Source_ID) (G1)meta.id;meta.maincharDEJ2000[28.7/32.2] Declination of the source (J2000)degpos.eq.dec;meta.mainRM[-41.5/92.1] Rotation Measure (1)rad.m**-2phys.polarization.rotMeasurefloate_RM[0.03/4.6] Uncertainty in RM (dRM)rad.m**-2stat.error;phys.polarization.rotMeasurefloatfPol[0.17/50] Fractional Polarization of source (fracPol)%phys.polarizationfloatStot[0.4/272] Total flux density in reference frequency (S_reffreq)mJy/beamphot.flux.density;em.radiofloatRMS