Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8229
Full metadata record
DC FieldValueLanguage
dc.contributor.authorGouellec, Valentin J. M. Le-
dc.contributor.authorAndersson, B-G-
dc.contributor.authorArchana Soam-
dc.contributor.authorSchirmer, Thiébaut-
dc.contributor.authorMichail, Joseph M.-
dc.contributor.authorLopez-Rodriguez, Enrique-
dc.contributor.authorFlores, Sophia-
dc.contributor.authorChuss, David T.-
dc.contributor.authorVaillancourt, John E.-
dc.contributor.authorHoang, Thiem-
dc.contributor.authorLazarian, Alex-
dc.date.accessioned2023-07-12T09:47:52Z-
dc.date.available2023-07-12T09:47:52Z-
dc.date.issued2023-07-10-
dc.identifier.citationThe Astrophysical Journal, Vol. 951, No. 2, 97en_US
dc.identifier.issn1538-4357-
dc.identifier.urihttp://hdl.handle.net/2248/8229-
dc.descriptionOpen Accessen_US
dc.descriptionOriginal content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.-
dc.description.abstractThe linear polarization of thermal dust emission provides a powerful tool to probe interstellar and circumstellar magnetic fields, because aspherical grains tend to align themselves with magnetic field lines. While the Radiative Alignment Torque (RAT) mechanism provides a theoretical framework for this phenomenon, some aspects of this alignment mechanism still need to be quantitatively tested. One such aspect is the possibility that the reference alignment direction changes from the magnetic field ("B-RAT") to the radiation field k-vector ("k-RAT") in areas of strong radiation fields. We investigate this transition toward the Orion Bar PDR, using multiwavelength SOFIA HAWC+ dust polarization observations. The polarization angle maps show that the radiation field direction is on average not the preferred grain alignment axis. We constrain the grain sizes for which the transition from B-RAT to k-RAT occurs in the Orion Bar (grains ≥ 0.1 μm toward the most irradiated locations), and explore the radiatively driven rotational disruption that may take place in the high-radiation environment of the Bar for large grains. While the grains susceptible to rotational disruption should be in suprathermal rotation and aligned with the magnetic field, k-RAT aligned grains would rotate at thermal velocities. We find that the grain size at which the alignment shifts from B-RAT to k-RAT corresponds to grains too large to survive the rotational disruption. Therefore, we expect a large fraction of grains to be aligned at suprathermal rotation with the magnetic field, and to potentially be subject to rotational disruption, depending on their tensile strength.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Astronomical Societyen_US
dc.relation.urihttps://doi.org/10.3847/1538-4357/accff7-
dc.rights© 2023. The Author(s)-
dc.subjectInterstellar magnetic fieldsen_US
dc.subjectInterstellar mediumen_US
dc.subjectPhotodissociation regionsen_US
dc.subjectDust physicsen_US
dc.subjectPolarimetryen_US
dc.titleThe Origin of Dust Polarization in the Orion Baren_US
dc.typeArticleen_US
Appears in Collections:IIAP Publications

Files in This Item:
File Description SizeFormat 
The Origin of Dust Polarization in the Orion Bar.pdf15.57 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.