J/MNRAS/451/74ivo://CDS.VizieR/J/MNRAS/451/74doi:10.26093/cds/vizier.74510074CDSGreen J.A.Caswell J.L.McClure-Griffiths N.M.2024-08-15T20:14:04Z2019-12-16T08:16:50ZCDS support team

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

cds-question@unistra.frastrophysical-masersradio-astronomypolarimetrymagnetic-fieldsWe present polarimetric maser observations with the Australia Telescope Compact Array of excited-state hydroxyl (OH) masers. We observed 30 fields of OH masers in full Stokes polarization with the Compact Array Broadband Backend at both the 6030 and 6035 MHz excited-state OH transitions, and the 6668 MHz methanol maser transition, detecting 70 sites of maser emission. Amongst the OH we found 112 Zeeman pairs, of which 18 exhibited candidate {pi} components. This is the largest single full polarimetric study of multiple sites of star formation for these frequencies, and the rate of 16 percent {pi} components clearly indicates that the {pi} component exists, and is comparable to the percentage recently found for ground-state transitions. This significant percentage of {pi} components, with consistent proportions at both ground- and excited-state transitions, argues against Faraday rotation suppressing the {pi} component emission. Our simultaneous observations of methanol found the expected low level of polarization, with no circular detected, and linear only found at the =<10 percent level for the brightest sources.2015MNRAS.451...74Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/451/74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/325/255 : 5cm OH masers survey (Baudry+ 1997)J/A+A/366/481 : ATCA/VLA OH 1612 MHz survey. III. (Sevenster+, 2001)J/A+A/414/235 : OH maser emission from star forming regionsJ/ApJS/160/220 : Full-polarization observations of OH masers (Fish+, 2005)J/other/PASA/26.454 : Precise positions of methanol masers (Caswell, 2009)J/ApJS/227/26 : ATCA obs. of ground-state OH masers (Qiao+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/451/74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/451/74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/451/74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/451/74https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/451/74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/451/74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/451/74/table1 (Maser detections (>=5{sigma} in two or more adjacent channels) as measured with the ATCA)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/451/74/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/451/74/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/451/74/table1?GETtext/xml+votable180.050000true156.0445417-57.87605560.0055555555555555566/28809 28830 29097 29100 29116 37343 37897 38024 41677 41681 41804 42159 42170 42172 42207 42215 42226 42378 42390 42393 42396-42397 42417 42441 42455-42457 42497-42498 43021https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/451/74?format=asciiRadiodefaultJ/MNRAS/451/74/table1Maser detections (>=5{sigma} in two or more adjacent channels) as measured with the ATCASimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainFreq[6030/6668] Maser transition frequencyMHzem.freqintFpeak[0.2/2350.1] Peak flux densityJyphot.flux.densityfloatn_FpeakNote on Fpeak, denoting the polarization percentage of at least one emission feature (1)meta.notecharPBC[1/16.67] Primary beam correction to be applied to listed flux density to account for offset position of source from primary beam centreinstr.paramfloatVpeak[-108/73.4] Peak velocitykm/sspect.dopplerVelocfloatb_Vel[-111.5/70] Velocity range, lower valuekm/sphys.veloc;instr.bandwidth;stat.minfloatB_Vel[-105/77] Velocity range, upper valuekm/sphys.veloc;instr.bandwidth;stat.maxfloatRefPrevious reference(s) (2)meta.ref;pos.framecharJ/MNRAS/451/74/table2Polarized excited-state OH features associated with Zeeman splittingNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[6030/6035] FrequencyMHzem.freqintVLSR[-106.44/72.49] Local standard of rest velocitykm/sphys.veloc;pos.lsrfloatPolType of polarized components (1)meta.codecharSp[0.08/153] Peak flux densityJyphot.flux.densityfloatTypeZeeman splitting type (2)meta.codecharNumZeeman splitting numberspect.line.broad.ZeemanCompFirst component of the pair/tripletmeta.idStrength[-10.4/11.4]? Field strengthmGphys.atmol.collStrength;obs.fieldfloatnullablee_Strength[0.1/4.6]? Uncertainty in StrengthmGstat.error;phys.atmol.collStrengthfloatnullableRel[AB] Reliability indicator (3)meta.codechar