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Title:
A Limit on the Polarized Anomalous Microwave Emission of Lynds 1622
Authors:
Mason, B. S.; Robishaw, T.; Heiles, C.; Finkbeiner, D.; Dickinson, C.
Affiliation:
AA(National Radio Astronomy Observatory, 520 Edgemont Rd. Charlottesville VA 22904, USA ), AB(University of California, Berkeley, 601 Campbell Hall Berkeley CA 94720, USA ; Current address: 570 Physics Annex, University of Sydney School of Physics, NSW 2006 Australia.), AC(University of California, Berkeley, 601 Campbell Hall Berkeley CA 94720, USA ), AD(Harvard-Smithsonian Center for Astrophysics, MS 51 61 Garden St. Cambridge, MA 02138, USA ), AE(Infrrrared Processing and Analysis Center, California Institute of Technology, MS 220-6, 1200 E. California Blvd., Pasadena, CA 91125, USA )
Publication:
The Astrophysical Journal, Volume 697, Issue 2, pp. 1187-1193 (2009). (ApJ Homepage)
Publication Date:
06/2009
Origin:
IOP
ApJ Keywords:
dust, extinction, ISM: individual: Lynds 1622, polarization, radio continuum: ISM
DOI:
10.1088/0004-637X/697/2/1187
Bibliographic Code:
2009ApJ...697.1187M

Abstract

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 1farcm3 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%.
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