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dc.contributor.authorClemens, Dan P.en_US
dc.contributor.authorTassis, K.en_US
dc.contributor.authorGoldsmith, Paul F.en_US
dc.date.accessioned2018-02-20T19:04:42Z
dc.date.available2018-02-20T19:04:42Z
dc.date.issued2016-12-20
dc.identifier.citationDan P. Clemens, K. Tassis, Paul F. Goldsmith. 2016. "THE MAGNETIC FIELD OF L1544. I. NEAR-INFRARED POLARIMETRY AND THE NON-UNIFORM ENVELOPE." The Astrophysical Journal, Volume 833, Issue 2, pp. 176 - 176.
dc.identifier.issn1538-4357
dc.identifier.urihttps://hdl.handle.net/2144/27097
dc.description.abstractThe magnetic field (B-field) of the starless dark cloud L1544 has been studied using near-infrared (NIR) background starlight polarimetry (BSP) and archival data in order to characterize the properties of the plane-of-sky B-field. NIR linear polarization measurements of over 1700 stars were obtained in the H band and 201 of these were also measured in the K band. The NIR BSP properties are correlated with reddening, as traced using the Rayleigh–Jeans color excess (H–M) method, and with thermal dust emission from the L1544 cloud and envelope seen in Herschel maps. The NIR polarization position angles change at the location of the cloud and exhibit their lowest dispersion there, offering strong evidence that NIR polarization traces the plane-of-sky B-field of L1544. In this paper, the uniformity of the plane-of-sky B-field in the envelope region of L1544 is quantitatively assessed. This allows evaluation of the approach of assuming uniform field geometry when measuring relative mass-to-flux ratios in the cloud envelope and core based on averaging of the radio Zeeman observations in the envelope, as done by Crutcher et al. In L1544, the NIR BSP shows the envelope B-field to be significantly non-uniform and likely not suitable for averaging Zeeman properties without treating intrinsic variations. Deeper analyses of the NIR BSP and related data sets, including estimates of the B-field strength and testing how it varies with position and gas density, are the subjects of later papers in this series.en_US
dc.format.extent176 - 176en_US
dc.relation.ispartofThe Astrophysical Journal
dc.subjectAstronomical and space sciencesen_US
dc.subjectOrganic chemistryen_US
dc.subjectPhysical chemistry (Incl. structural)en_US
dc.subjectAstronomy & astrophysicsen_US
dc.subjectMagnetic fieldsen_US
dc.subjectPolarizationen_US
dc.subjectL1544en_US
dc.subjectGalaxy: disken_US
dc.subjectDark clouden_US
dc.titleThe magnetic field of L1544. I. Near-infrared polarimetry and the non-uniform envelopeen_US
dc.typeArticleen_US
dc.identifier.doi10.3847/1538-4357/833/2/176
pubs.elements-sourcecrossrefen_US
pubs.notesjournal_title: The Astrophysical Journal article_type: paper article_title: THE MAGNETIC FIELD OF L1544. I. NEAR-INFRARED POLARIMETRY AND THE NON-UNIFORM ENVELOPE copyright_information: © 2016. The American Astronomical Society. All rights reserved. date_received: 2016-05-05 date_accepted: 2016-10-11 date_epub: 2016-12-16en_US
pubs.notesEmbargo: No embargoen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Astronomyen_US
pubs.publication-statusPublisheden_US
dc.date.online2016-12-19
dc.identifier.orcid0000-0002-9947-4956 (Clemens, Dan P.)


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