Hubble Space Telescope NICMOS polarization measurements of OMC-1 Simpson, James en_US Colgan, Sean en_US Erickson, E en_US Burton, Michael en_US Schultz, Angie en_US 2021-11-25T12:56:30Z 2021-11-25T12:56:30Z 2006 en_US
dc.description.abstract We present 2 mu m polarization measurements of positions in the IRc2 and BN regions of the OrionMolecular Cloud (OMC-1) made with NICMOS Camera 2 (0.`2 resolution) on the Hubble Space Telescope. Our results are as follows: BN is similar to 29% polarized by dichroic absorption and appears to be the illuminating source for most of the nebulosity to its north and for up to similar to 5` to its south. Although the stars are probably all polarized by dichroic absorption, there are a number of compact but non-point-source objects that could be polarized by a combination of both dichroic absorption and local scattering of starlight. We identify several candidate YSOs, including an approximately edge-on bipolar YSO 8`7 east of BN, and a deeply embedded variable star. Additional strongly polarized sources are IRc2-B, IRc2-D, and IRc7, all of which are obviously self-luminous at mid-infrared wavelengths and may be YSOs. None of these is a reflection nebula illuminated by a star located near radio source I, as was previously suggested. Other IRc sources are clearly reflection nebulae: IRc3 appears to be illuminated by IRc2-B or a combination of the IRc2 sources, and IRc4 and IRc5 appear to be illuminated by an unseen star in the vicinity of radio source I, or by star n or IRc2-A. Trends in the magnetic field direction are inferred from the polarization of the 26 stars that are bright enough to be seen as NICMOS point sources. The most polarized star has a polarization position angle different from its neighbors by similar to 40 degrees, but in agreement with the grain alignment inferred from millimeter polarization measurements of the cold dust cloud in the southern part of OMC-1. en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.subject.other infrared : ISM en_US
dc.subject.other infrared : stars en_US
dc.subject.other ISM : individual (Orion BN/ KL en_US
dc.subject.other ISM en_US
dc.subject.other magnetic fields en_US
dc.subject.other stars : formation en_US
dc.subject.other stars : pre-main sequence en_US
dc.title Hubble Space Telescope NICMOS polarization measurements of OMC-1 en_US
dc.type Journal Article en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.description.notePublic The Astrophysical Journal is published by the, American Astronomical Society, en_US
unsw.description.publisherStatement © 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A. en_US
unsw.identifier.doiPublisher en_US
unsw.relation.faculty Science
unsw.relation.ispartofissue 1 en_US
unsw.relation.ispartofjournal Astrophysical Journal en_US
unsw.relation.ispartofpagefrompageto 339-353 en_US
unsw.relation.ispartofvolume 642 en_US
unsw.relation.originalPublicationAffiliation Simpson, James en_US
unsw.relation.originalPublicationAffiliation Colgan, Sean en_US
unsw.relation.originalPublicationAffiliation Erickson, E en_US
unsw.relation.originalPublicationAffiliation Burton, Michael, Physics, Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Schultz, Angie, Physics, Faculty of Science, UNSW en_US School of Physics *
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