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- W2092185789 abstract "view Abstract Citations (63) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Theory of Interstellar Polarization. Spitzer, Lyman, Jr. ; Tukey, John W. Abstract A detailed analysis is given of the polarization of starlight produced by ferromagnetic grains, oriented by an interstellar magnetic field. Lack of information on the optical properties of large elongated grains with a high refractive index prevents a consideration of grains with a circumference very much bigger than 8000 A, the longest wave length at which polarization measures have been made. Grains of about this size, with a mean radius of 1.3 X 10-i cm and composed primarily of Fe, Mg, and their compounds, are shown to arise from collisions between ordinary grains, containing predominantly H3O, NHi, and CH4. It is estimated that one out of every four grains is compound, with a shell of ices surrounding a dense nucleus of this sort. It is quite possible that such nuclei will be ferromagnetic; if so, they will all be highly magnetized single domains. However, a magnetic field of about 2 X 10- gauss is apparently required to orient these grains sufficiently to explain the observed polarization. Larger grains, which could be oriented by weaker fields, might form in two ways. First, the individual nuclei might stick together, forming long rods; this process will take place at an appreciable rate only if most of the grains occur in concentrations in which the density is one or two orders of magnitude greater than the assumed average cloud density. Second, successive collisions between compound nuclei and other grains would be expected to produce some ferromagnetic grains with relatively large radii. Since the optical properties of such large grains are unknown, whether or not they could explain the observed polarization is uncertain. Publication: The Astrophysical Journal Pub Date: September 1951 DOI: 10.1086/145463 Bibcode: 1951ApJ...114..187S full text sources ADS |" @default.
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- W2092185789 date "1951-09-01" @default.
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- W2092185789 title "A Theory of Interstellar Polarization." @default.
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