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GRAIN ALIGNMENT IN THE TAURUS DARK CLOUD

Authors
  • Gerakines, P. A.
  • Whittet, D. C. B.
Type
Preprint
Publication Date
Apr 28, 1995
Submission Date
Apr 28, 1995
Identifiers
DOI: 10.1086/309828
arXiv ID: astro-ph/9504100
Source
arXiv
License
Unknown
External links

Abstract

Variations in polarization efficiency (p/A) of interstellar grains as a function of environment place vital constraints on models for the mechanism of their alignment. We use polarimetry of background field stars to investigate alignment in the Taurus dark cloud as a function of optical depth for extinctions of A_K < 2.5 (A_V < 25). Results show a strong systematic trend in polarization efficiency with extinction. We discuss the possibility of a relationship between p/A and icy grain mantle growth, since mantles are detected in Taurus only for extinctions where p/A is lowest. A simple density model of alignment by paramagnetic alignment (Davis & Greenstein 1951) predicts that the magnetic field strength (B) scales with density to the power k=0.28.

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