J/A+A/618/A163ivo://CDS.VizieR/J/A+A/618/A163doi:10.26093/cds/vizier.36180163CDSJorquera S.Bertrang G. H.-M.2018-11-05T10:52:51Z2018-10-23T09:51:04ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediummagnetic-fieldsThe role of magnetic fields in the process of star formation is a matter of continuous debate. Clear observational proof of the general influence of magnetic fields on the early phase of cloud collapse is still pending. In an earlier study on Bok globules with simple structures, we find strong indications of dominant magnetic fields across large spatial scales. The aim of this study is to test the magnetic field influence across Bok globules with more complex density structures. We apply near-infrared polarimetry to trace the magnetic field structure on scales of 10^4^-10^5^au in selected Bok globules. The combination of these measurements with archival data in the optical and sub-mm wavelength range allows us to characterize the magnetic field on scales of 10^3^-10^6^au. We present polarimetric data in the near-infrared wavelength range for the three Bok globules CB34, CB56, and [OMK2002] 18, combined with archival polarimetric data in the optical wavelength range for CB34 and CB56, and in the sub millimeter wavelength range for CB34 and [OMK2002] 18. We find a strong polarization signal (P>2%) in the near-infrared for all three globules. For CB34, we detect a connection between the structure on scales of 10^4^-10^5^au to 10^5^-10^6^au. For CB56, we trace aligned polarization segments in both the near-infrared and optical data, suggesting a connection of the magnetic field structure across the whole globule. In the case of [OMK2002]18, we find ordered polarization structures on scales of 10^4^-10^5^au. We find strongly aligned polarization segments on large scales which indicate dominant magnetic fields across Bok globules with complex density structures. To reconcile our findings in globules, the lowest mass clouds known, and the results on intermediate (e.g. Taurus) and more massive (e.g. Orion) clouds, we postulate a mass dependent role of magnetic fields, whereby magnetic fields appear to be dominant on low and high mass but rather sub dominant on intermediate mass clouds.2018A&A...618A.163Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/618/A163CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/618/A163https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/618/A163http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/618/A163https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/618/A163https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/618/A163http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/618/A163GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/618/A163/cb34 (Bok globule CB34)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A163/cb34?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A163/cb34?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A163/cb34?GETtext/xml+votable180.050000true86.755083321.04650.005555555555555556Cone search capability for table J/A+A/618/A163/cb56 (Bok globule CB56)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A163/cb56?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A163/cb56?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A163/cb56?GETtext/xml+votable180.050000true108.6622917-25.17127780.005555555555555556Cone search capability for table J/A+A/618/A163/omk (Bok globule [OMK2002] 18)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/618/A163/omk?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/618/A163/omk?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/618/A163/omk?GETtext/xml+votable180.050000true65.444541715.53138890.0055555555555555566/23533 24158 39912https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/618/A163?format=asciidefaultJ/A+A/618/A163/cb34Bok globule CB34recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainQQ value of the Stokes vector of the starphys.polarization.stokesdoubleUU value of the Stokes vector of the starphys.polarization.stokesdoubleII value of the Stokes vector of the starphys.polarization.stokesdoubleJ/A+A/618/A163/cb56Bok globule CB56recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainQQ value of the Stokes vector of the starphys.polarization.stokesdoubleUU value of the Stokes vector of the starphys.polarization.stokesdoubleII value of the Stokes vector of the starphys.polarization.stokesdoubleJ/A+A/618/A163/omkBok globule [OMK2002] 18recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainQQ value of the Stokes vector of the starphys.polarization.stokesdoubleUU value of the Stokes vector of the starphys.polarization.stokesdoubleII value of the Stokes vector of the starphys.polarization.stokesdouble