J/ApJ/751/138ivo://CDS.VizieR/J/ApJ/751/138doi:10.26093/cds/vizier.17510138CDSSantos F.P.Roman-Lopes A.Franco G.A.P.2017-06-27T06:37:36Z2014-02-17T09:34:25ZCDS support team

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

cds-question@unistra.frinfrared-photometrypolarimetryh-ii-regionsyoung-stellar-objectsThe RCW41 star-forming region is embedded within the Vela Molecular Ridge, hosting a massive stellar cluster surrounded by a conspicuous HII region. Understanding the role of interstellar magnetic fields and studying the newborn stellar population is crucial to building a consistent picture of the physical processes acting on this kind of environment. We carried out a detailed study of the interstellar polarization toward RCW41 with data from an optical and near-infrared polarimetric survey. Additionally, deep near-infrared images from the 3.5 meter New Technology Telescope were used to study the photometric properties of the embedded young stellar cluster, revealing several YSO candidates. By using a set of pre-main-sequence isochrones, a mean cluster age in the range 2.5-5.0 million years was determined, and evidence of sequential star formation was revealed. An abrupt decrease in R-band polarization degree was noticed toward the central ionized area, probably due to low grain alignment efficiency caused by the turbulent environment and/or the weak intensity of magnetic fields. The distortion of magnetic field lines exhibits dual behavior, with the mean orientation outside the area approximately following the borders of the star-forming region and directed radially toward the cluster inside the ionized area, in agreement with simulations of expanding H II regions. The spectral dependence of polarization allowed a meaningful determination of the total-to-selective extinction ratio by fittings of the Serkowski relation. Furthermore, a large rotation of polarization angle as a function of wavelength was detected toward several embedded stars.2012ApJ...751..138Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/751/138CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/707/1836 : BLAST survey in Vela-D (Olmi+, 2009)J/A+A/461/949 : JHK photometry around IRAS 09149-4743 (Ortiz+, 2007)J/A+A/399/147 : JHK photometry of C-cloud IRAS sources (Massi+, 2003)J/A+A/400/533 : New IR star clusters in southern Milky Way (Dutra+, 2003)J/A+AS/136/471 : JHK photometry of D-cloud IRAS sources (Massi+, 1999)J/A+AS/115/285 : Catalogue of massive young stellar objects (Chan+, 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/751/138https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/751/138http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/751/138https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/751/138https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/751/138http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/751/138GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/751/138/photom (Near-IR photometric data of RCW41 from Dataset A and Dataset B)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/138/photom?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/138/photom?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/138/photom?GETtext/xml+votable180.050000true139.19975-47.95494440.005555555555555556Cone search capability for table J/ApJ/751/138/table3 (The V, R, I and H polarimetric data set)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/751/138/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/751/138/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/751/138/table3?GETtext/xml+votable180.050000true138.907625-47.87605560.0055555555555555566/37846 378477.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/751/138?format=asciiInfrareddefaultJ/ApJ/751/138/photomNear-IR photometric data of RCW41 from Dataset A and Dataset Be_Ksmag[0.01/0.6] Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.KfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetDataset identification (A or B)meta.idcharRAJ2000[9] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[47/48] Degree of Declination (J2000)pos.eq.dec;meta.mainMNumber of sources in all tables withing 0.8arcsecmeta.numberintnullableJmag[9.7/21.8]? NTT/SofI J band magnitude (only for table 1) (1)magphot.mag;em.IR.Jfloatnullablee_Jmag[0.02/0.3]? Uncertainty in Jmag (only for table 1) (1)magstat.error;phot.mag;em.IR.JfloatnullableHmag[8.9/21]? NTT/SofI H band magnitude (1)magphot.mag;em.IR.Hfloatnullablee_Hmag[0.01/0.6]? Uncertainty in Hmag(1)magstat.error;phot.mag;em.IR.HfloatnullableKsmag[8.6/20] NTT/SofI K_S_ band magnitudemagphot.mag;em.IR.Kfloat2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) if Ksmag<15 within 1"meta.ref.urlcharJ/ApJ/751/138/table3The V, R, I and H polarimetric data setrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[9] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[47/48] Degree of Declination (J2000)pos.eq.dec;meta.mainMNumber of sources in all tables withing 0.8arcsecmeta.numberintnullableNbNumber of bands observed for this sourcemeta.numberintnullableBand[HIRV] Observed spectral band (V, R, I or H)instr.bandwidthcharPol[0.01/16]? Polarization (1)%phys.polarizationfloatnullablee_Pol[0.02/7]? Uncertainty in Pol (1)%stat.errorfloatnullablePA[0/180]? Position angle of polarization (1)degpos.posAngfloatnullablee_PA[0.3/271]? Uncertainty in PA (1)degstat.errorfloatnullable