Show simple item record

hal.structure.identifierAMOR 2013
dc.contributor.authorTANG, Ya-Wen
dc.contributor.authorHO, Paul T. P.
dc.contributor.authorKOCH, Patrick M.
hal.structure.identifierAMOR 2013
dc.contributor.authorGUILLOTEAU, S.
hal.structure.identifierAMOR 2013
dc.contributor.authorDUTREY, Anne
dc.date.created2012-12-04
dc.date.issued2013
dc.identifier.issn0004-637X
dc.description.abstractEnWe present the first high-angular resolution (up to 0.7", ~5000 AU) polarization and thermal dust continuum images toward the massive star-forming region W51 North. The observations were carried out with the Submillimeter Array (SMA) in both the subcompact (SMA-SubC) and extended (SMA-Ext) configurations at a wavelength of 870 micron. W51 North is resolved into four cores (SMA1 to SMA4) in the 870 micron continuum image. The associated dust polarization exhibits more complex structures than seen at lower angular resolution. We analyze the inferred morphologies of the plane-of-sky magnetic field (B_bot) in the SMA1 to SMA4 cores and in the envelope using the SMA-Ext and SMA-SubC data. These results are compared with the B_bot archive images obtained from the CSO and JCMT. A correlation between dust intensity gradient position angles (phi_{nabla I}) and magnetic field position angles (phi_B) is found in the CSO, JCMT and both SMA data sets. This correlation is further analyzed quantitatively. A systematically tighter correlation between phi_{nabla I} and phi_B is found in the cores, whereas the correlation decreases in outside-core regions. Magnetic field-to-gravity force ratio (Sigma_B) maps are derived using the newly developed polarization - intensity gradient method by Koch, Tang & Ho 2012. We find that the force ratios tend to be small (Sigma_B <= 0.5) in the cores in all 4 data sets. In regions outside of the cores, the ratios increase or the field is even dominating gravity (Sigma_B > 1). This possibly provides a physical explanation of the tightening correlation between phi_{nabla I} and phi_B in the cores: the more the B field lines are dragged and aligned by gravity, the tighter the correlation is. Finally, we propose a schematic scenario for the magnetic field in W51 North to interpret the four polarization observations at different physical scales.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.title.enDust continuum and Polarization from Envelope to Cores in Star Formation: A Case Study in the W51 North region
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/763/2/135
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1212.0656
bordeaux.journalThe Astrophysical Journal
bordeaux.pageid. 135
bordeaux.volume763
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-00804425
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00804425v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=The%20Astrophysical%20Journal&amp;rft.date=2013&amp;rft.volume=763&amp;rft.issue=2&amp;rft.spage=id.%20135&amp;rft.epage=id.%20135&amp;rft.eissn=0004-637X&amp;rft.issn=0004-637X&amp;rft.au=TANG,%20Ya-Wen&amp;HO,%20Paul%20T.%20P.&amp;KOCH,%20Patrick%20M.&amp;GUILLOTEAU,%20S.&amp;DUTREY,%20Anne&amp;rft.genre=article


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record