Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.295..371j&link_type=abstract
Nature, vol. 295, Feb. 4, 1982, p. 371-375.
Astronomy and Astrophysics
Astronomy
23
Cosmic Dust, Interstellar Magnetic Fields, Interstellar Matter, Linear Polarization, Astrometry, Grains, Hydrogen Recombinations, Particle Size Distribution, Polarized Light
Scientific paper
The linear polarization of light observed in many distant stars, presumably an effect of absorption of starlight by elongated interstellar dust grains, provides a means of mapping the magnetic field lines in the Galaxy, as well as probing the properties of the intervening dust. Processes for grain alignment in the galactic magnetic field are reviewed: evidence is examined for grains being spun up to extremely high (10 to the 9th Hz) angular frequencies by the recoil of hydrogen recombination on grains, as an essential part of the alignment process. Grain alignment would then be inhibited in regions of grain growth and would be most effective where grain growth is inhibited or reaches saturation.
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