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A Limit on the Polarized Anomalous Microwave Emission of Lynds 1622

Mason, B. S. and Robishaw, T. and Heiles, C. and Finkbeiner, D. and Dickinson, C. (2009) A Limit on the Polarized Anomalous Microwave Emission of Lynds 1622. Astrophysical Journal, 697 (2). pp. 1187-1193. ISSN 0004-637X.

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The dark cloud Lynds 1622 is one of a few specific sites in the Galaxy where, relative to observed free-free and vibrational dust emission, there is a clear excess of microwave emission. In order to constrain models for this microwave emission, and to better establish the contribution which it might make to ongoing and near-future microwave background polarization experiments, we have used the Green Bank Telescope to search for linear polarization at 9.65 Ghz toward Lynds 1622. We place a 95.4% upper limit of 88 μK (123 μK at 99.7% confidence) on the total linear polarization of this source averaged over a 1.'3 FWHM beam. Relative to the observed level of anomalous emission in Stokes I these limits correspond to fractional linear polarizations of 2.7% and 3.5%.

Item Type:Article
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Dickinson, C.0000-0002-0045-442X
Additional Information:© 2009 The American Astronomical Society. Received 2009 January 2; accepted 2009 March 2; published 2009 May 11.
Subject Keywords:dust, extinction; ISM: individual (Lynds 1622); polarization; radio continuum: ISM
Issue or Number:2
Record Number:CaltechAUTHORS:20090818-152816437
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Official Citation:A Limit on the Polarized Anomalous Microwave Emission of Lynds 1622 B. S. Mason, T. Robishaw, C Heiles, D. Finkbeiner, and C. Dickinson 2009 ApJ 697 1187-1193 doi: 10.1088/0004-637X/697/2/1187.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15163
Deposited By: Tony Diaz
Deposited On:08 Sep 2009 21:23
Last Modified:09 Mar 2020 13:18

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