Grain Alignment in Starless Cores

Details Grain Alignment in Starless Cores Grain Alignment in Starless Cores

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725122j&link_type=abstract

American Astronomical Society, AAS Meeting #217, #251.22; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present observations of the polarization at 2.2 microns of background field stars shining through dense molecular cloud cores with no ongoing star formation, so-called 'starless cores'. This allows us to extend the work of Whittet et al. to Av > 40 mag. We compare these results to previous polarimetry of background field stars and embedded YSO's. We find that beyond Av ˜ 12 mag., the observations are consistent with the absence of polarizing grains at these extreme optical depths. This is in contrast for lines of sight to embedded YSO's, which maintain increasing polarization with optical depth up to Av = 100 mag.

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