Grain Alignment by Radiation in Dark Clouds and Cores

Details Grain Alignment by Radiation in Dark Clouds and Cores Grain Alignment by Radiation in Dark Clouds and Cores

2005-05-28

arxiv.org/abs/astro-ph/0505571v1

Astrophys.J. 631 (2005) 361-370

Astronomy and Astrophysics

Astrophysics

11 pages emulated ApJ, 12 figures, submitted to ApJ

Scientific paper

10.1086/432528

We study alignment of grains by radiative torques. We found steep rise of radiative torque efficiency as grain size increases. This allows larger grains that are known to exist within molecular clouds to be aligned by the attenuated and reddened interstellar radiation field. In particular, we found that, even deep inside giant molecular clouds, e.g. at optical depths corresponding to less than Av of 10 large grains can still be aligned by radiative torque. This means that, contrary to earlier claims, far-infrared/submillimeter polarimetry provides a reliable tool to study magnetic fields of pre-stellar cores. Our results show that the grain size distribution is important for determining the relation between the degree of polarization and intensity.

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