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dc.contributor.authorWhittet, D.C.B.
dc.contributor.authorHough, J.
dc.contributor.authorLazarian, A.
dc.contributor.authorHoang, T.
dc.date.accessioned2013-01-07T09:59:12Z
dc.date.available2013-01-07T09:59:12Z
dc.date.issued2008
dc.identifier.citationWhittet , D C B , Hough , J , Lazarian , A & Hoang , T 2008 , ' The efficiency of grain alignment in dense interstellar clouds: a reassessment of constraints from near-infrared polarization ' , The Astrophysical Journal , vol. 674 , no. 1 , pp. 304-315 . https://doi.org/10.1086/525040
dc.identifier.issn1538-4357
dc.identifier.otherPURE: 151124
dc.identifier.otherPURE UUID: bc186037-3a52-4c59-afb5-be0a00ea814e
dc.identifier.otherdspace: 2299/2774
dc.identifier.otherScopus: 40249112113
dc.identifier.urihttp://hdl.handle.net/2299/9485
dc.descriptionOriginal article can be found at: http://www.iop.org/EJ/journal/apj Copyright American Astronomical Society. DOI: 10.1086/525040 [Full text of this article is not available in the UHRA]
dc.description.abstractWe present spectropolarimetry of the solid CO feature at 4.67 μm along the line of sight to Elias 16, a field star background to the Taurus dark cloud. A clear increase in polarization is observed across the feature with the peak of polarization shifted in wavelength relative to the peak of absorption. This shows that dust grains in dense, cold environments (temperatures ∼20K or less) can align and produce polarization by dichroic absorption. For a grain model, consisting of a core with a single mantle, the polarization feature is best modelled by a thick CO mantle, possibly including 10 per cent water-ice, with the volume ratio of mantle to bare grain of ∼5. Radiative torques could be responsible for the grain alignment provided the grain radius is at least 0.5 μm. This would require the grain cores to have a radius of at least 0.3 μm, much larger than grain sizes in the diffuse interstellar medium. Sizes of this order seem reasonable on the basis of independent evidence for grain growth by coagulation, as well as mantle formation, inside dense clouds.en
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.titleThe efficiency of grain alignment in dense interstellar clouds: : a reassessment of constraints from near-infrared polarizationen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted2008
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1086/525040
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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