J/ApJ/741/112ivo://CDS.VizieR/J/ApJ/741/112doi:10.26093/cds/vizier.17410112CDSPoidevin F.Bastien P.Jones T.J.2017-10-09T08:09:26Z2017-09-11T09:26:24ZCDS support team

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

cds-question@unistra.frmolecular-cloudspolarimetryinfrared-sourcesmagnetic-fieldsNew visible and K-band polarization measurements of stars surrounding molecular clouds in Orion A and stars in the Becklin-Neugebauer (BN) vicinity are presented. Our results confirm that magnetic fields located inside the Orion A molecular clouds and in their close neighborhood are spatially connected. On and around the BN object, we measured the angular offsets between the K-band polarization data and available submillimeter (submm) data. We find high values of the polarization degree, P_K_, and of the optical depth, {tau}_K_, close to an angular offset position of 90{deg} whereas lower values of P_K_ and {tau}_K_ are observed for smaller angular offsets. We interpret these results as evidence for the presence of various magnetic field components toward lines of sight in the vicinity of BN. On a larger scale, we measured the distribution of angular offsets between available H-band polarization data and the same submm data set. Here we find an increase of <P_H_> with angular offset, which we interpret as a rotation of the magnetic field by <~60{deg}. This trend generalizes previous results on small scales toward and around lines of sight to BN and is consistent with a twist of the magnetic field on a larger scale toward OMC-1. A comparison of our results with several other studies suggests that a two-component magnetic field, perhaps helical, could be wrapping the OMC-1 filament.2011ApJ...741..112Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/741/112CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/604/717 : Polarization in OMC 1/4 (Houde+, 2004)J/AJ/136/621 : Near-infrared polarimetry of M42 (Kusakabe+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/741/112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/741/112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/741/112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/741/112https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/741/112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/741/112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/741/112/table5 (IR Polarization Data in the BN Region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/741/112/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/741/112/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/741/112/table5?GETtext/xml+votable180.050000true83.8175-5.3650560.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/741/112?format=asciiInfrareddefaultJ/ApJ/741/112/table5IR Polarization Data in the BN RegiontauKOptical depthphys.absorption.opticalDepthfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[0/38] Star number (NN)meta.id;meta.mainintn_Star[BN ] Note on star (1)meta.notecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainnullablePKDegree of polarization in K band (2)%phys.polarization;em.IR.KfloatthetaKPosition angle in K banddegpos.posAngfloate_thetaKUncertainty in thetaKdegstat.errorfloatH-KH-K color indexmagphot.color;em.IR.H;em.IR.KfloatLBLSPossible source identification in Lonsdale et al. (1982AJ.....87.1819L), LBLS a in Simbadmeta.idcharS+SPossible source identification in Stolovy et al. (1998ApJ...492L.151S), [SBE98] CBN in Simbad and Shuping et al. (2004AJ....128..363S), [RLK73] IRc NNW in Simbadmeta.idcharIDOther identification designationmeta.idcharthetaoff[2/82]? Angular offset between 2.2 {mu}m and 350 {mu}mdegpos;arith.diffintnullableSC[0/1] Selection code (3)meta.codechar