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Probing the Turbulent Ambipolar Diffusion Scale in Molecular Clouds with Spectroscopy

dc.contributor.authorHEZAREH, Talayeh
dc.contributor.authorCSENGERI, Timea
hal.structure.identifierInstitut de Recherche en Immunologie et en Cancérologie [UdeM-Montréal] [IRIC]
dc.contributor.authorHOUDE, Martin
hal.structure.identifierFORMATION STELLAIRE 2014
dc.contributor.authorHERPIN, Fabrice
hal.structure.identifierFORMATION STELLAIRE 2014
dc.contributor.authorBONTEMPS, Sylvain
dc.date.created2013-09-02
dc.date.issued2014
dc.identifier.issn0035-8711
dc.description.abstractEnWe estimate the turbulent ambipolar diffusion length scale and magnetic field strength in the massive dense cores CygX-N03 and CygX-N53, located in the Cygnus-X star-forming region. The method we use requires comparing the velocity dispersions in the spectral line profiles of the coexistent ion and neutral pair H13CN and H13CO+ (J=1-0) at different length scales. We fit Kolmogorov-type power laws to the lower envelopes of the velocity dispersion spectra of the two species. This allows to calculate the turbulent ambipolar diffusion scale, which in turn determines the plane-of-the-sky magnetic field strength. We find turbulent ambipolar diffusion length scales of 3.8+-0.1 mpc and 21.2+-0.4 mpc, and magnetic field strengths of 0.33 mG and 0.76 mG for CygX-N03 and CygX-N53, respectively. These magnetic field values have uncertainties of a factor of a few. Despite a lower signal-to-noise ratio of the data in CygX-N53 than in CygX-N03, and the caveat that its stronger field might stem in part from projection effects, the difference in field strengths suggests different fragmentation activities of the two cores. Even though the quality of our data, obtained with the IRAM Plateau de Bure Interferometer (PdBI), is somewhat inferior to previous single-dish data, we demonstrate that this method is suited also for observations at high spatial resolution.
dc.language.isoen
dc.publisherOxford University Press (OUP): Policy P - Oxford Open Option A
dc.title.enProbing the Turbulent Ambipolar Diffusion Scale in Molecular Clouds with Spectroscopy
dc.typeArticle de revue
dc.identifier.doi10.1093/mnras/stt2237
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1308.3854
bordeaux.journalMonthly Notices of the Royal Astronomical Society
bordeaux.page663-671
bordeaux.volume438
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00858387
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00858387v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society&rft.date=2014&rft.volume=438&rft.issue=1&rft.spage=663-671&rft.epage=663-671&rft.eissn=0035-8711&rft.issn=0035-8711&rft.au=HEZAREH,%20Talayeh&CSENGERI,%20Timea&HOUDE,%20Martin&HERPIN,%20Fabrice&BONTEMPS,%20Sylvain&rft.genre=article


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