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On mapping the magnetic field direction in molecular clouds by polarization measurements

Goldreich, Peter and Kylafis, Nikolaos D. (1981) On mapping the magnetic field direction in molecular clouds by polarization measurements. Astrophysical Journal, 243 (2). L75-L78. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20130307-073145033

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Abstract

We predict that interstellar radio-frequency lines possess a few percent linear polarization, provided that (1) the radiative transition rate is at least comparable to the collision rate, (2) the optical depth is moderate. and anisotropic, and (3) the number of extrema of the velocity component along the line of sight through the source is small. If the Zeeman splitting exceeds both the collisional frequency and the radiative transition rate, then the polarization is aligned either perpendicular to or parallel to the projection of the magnetic field on the plane of the sky.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/183446DOIUNSPECIFIED
http://adsabs.harvard.edu/doi/10.1086/183446ADSUNSPECIFIED
Additional Information:© 1981 American Astronomical Society. Received 1980 July 21; accepted 1980 October 6. We are indebted to Charles Alcock, Fred Lo, and Tom Philips for helpful advice. This research was supported by NSF grants AST79-24978 and AST79-22012.
Funders:
Funding AgencyGrant Number
NSFAST79-24978
NSFAST79-22012
Subject Keywords:interstellar: magnetic fields, polarization, radiative transfer
Issue or Number:2
Record Number:CaltechAUTHORS:20130307-073145033
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130307-073145033
Official Citation:On mapping the magnetic field direction in molecular clouds by polarization measurements Goldreich, P.; Kylafis, N. D. Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Jan. 15, 1981, p. L75-L78
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37363
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Mar 2013 15:55
Last Modified:03 Oct 2019 04:47

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