J/ApJ/807/5ivo://CDS.VizieR/J/ApJ/807/5doi:10.26093/cds/vizier.18070005CDSFranco G.A.P.Alves F.O.2017-01-23T22:00:00Z2015-12-10T14:31:41ZCDS support team

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

cds-question@unistra.frpolarimetrymolecular-cloudsinfrared-photometryDeep R-band CCD linear polarimetry collected for fields with lines of sight toward the Lupus I molecular cloud is used to investigate the properties of the magnetic field within this molecular cloud. The observed sample contains about 7000 stars, almost 2000 of them with a polarization signal-to-noise ratio larger than 5. These data cover almost the entire main molecular cloud and also sample two diffuse infrared patches in the neighborhood of Lupus I. The large-scale pattern of the plane-of-sky projection of the magnetic field is perpendicular to the main axis of Lupus I, but parallel to the two diffuse infrared patches. A detailed analysis of our polarization data combined with the Herschel/SPIRE 350{mu}m dust emission map shows that the principal filament of Lupus I is constituted by three main clumps that are acted on by magnetic fields that have different large-scale structural properties. These differences may be the reason for the observed distribution of pre- and protostellar objects along the molecular cloud and the cloud's apparent evolutionary stage. On the other hand, assuming that the magnetic field is composed of large-scale and turbulent components, we find that the latter is rather similar in all three clumps. The estimated plane-of-sky component of the large-scale magnetic field ranges from about 70 to 200{mu}G in these clumps. The intensity increases toward the Galactic plane. The mass-to-magnetic flux ratio is much smaller than unity, implying that Lupus I is magnetically supported on large scales.2015ApJ...807....5Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/807/5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/139 : Herschel Observation Log (Herschel Science Centre, 2013)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/569/L1 : Polarization hole in a starless core (Alves+, 2014)J/PASJ/63/S1 : Atlas of dark clouds based on 2MASS (Dobashi+, 2011)J/ApJS/177/551 : Spitzer c2d survey of Lupus dark clouds (Merin+, 2008)J/ApJ/603/584 : Polarimetry toward Musca dark cloud (Pereyra+, 2004)J/MNRAS/331/474 : ubvy{beta} photometry in the Lupus dark cloud (Franco, 2002)http://www.herschel.fr/cea/gouldbelt/en/ : Gould Belt survey web pagehttp://darkclouds.u-gakugei.ac.jp/ : Dark clouds extinction mapshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/807/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/807/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/807/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/807/5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/807/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/807/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/807/5/table1 (Polarimetric data obtained for Lupus I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/807/5/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/807/5/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/807/5/table1?GETtext/xml+votable180.050000true234.0574583-33.04233330.0055555555555555565/10684 6/42714 42744 427461.1166583743361574e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/807/5?format=asciiInfrareddefaultJ/ApJ/807/5/table1Polarimetric data obtained for Lupus IrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning sequence numbermeta.id;meta.mainintRAJ2000[15] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[33/35] Degree of Declination (J2000)pos.eq.dec;meta.mainGLONLongitude in Galactic coordinatedegpos.galactic.lonGLATLatitude in Galactic coordinatedegpos.galactic.latfloatPol[0.01/11.1] Degree of polarization (P) in R-band%phys.polarization;em.opt.Rfloate_PolMeasured uncertainty in Pol%stat.errorfloats_PolTheoretical uncertainty in Pol%stat.error;arith.ratiofloatThetaPolarization position angle (measured from north to east)degpos.posAngfloatJmag[6.5/17.2] J magnitude (from 2MASS catalogue)magphot.mag;em.IR.Jfloate_Jmag[0.01/0.6]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[5.8/17.8] H magnitude (from 2MASS catalogue)magphot.mag;em.IR.Hfloate_Hmag[0.02/0.5]? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag[5.5/17.2] K magnitude (from 2MASS catalogue)magphot.mag;em.IR.Kfloate_Kmag[0.01/0.7]? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) within 2"meta.ref.urlchar