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Title:
Infrared polarization of the galactic center. II
Authors:
Knacke, R. F.; Capps, R. W.
Affiliation:
AA(Kitt Peak National Observatory; Steward Observatory, Tucson, Ariz.), AB(Kitt Peak National Observatory; Steward Observatory, Tucson, Ariz.)
Publication:
Astrophysical Journal, Part 1, vol. 216, Aug. 15, 1977, p. 271-276. (ApJ Homepage)
Publication Date:
08/1977
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GALACTIC NUCLEI, INFRARED RADIATION, MILKY WAY GALAXY, POLARIZATION CHARACTERISTICS, ASTRONOMICAL MAPS, GRANULAR MATERIALS, INTERSTELLAR MAGNETIC FIELDS, NEAR INFRARED RADIATION, POLARIZED LIGHT, SPIRAL GALAXIES
Comment:
A&AA ID. AAA020.156.006
DOI:
10.1086/155469
Bibliographic Code:
1977ApJ...216..271K

Abstract

Polarization direction and magnitude are reported for infrared sources at 2.2, 3.5, and 11.5 microns of the galactic center (Sgr A). The polarization orientation at 2.2 and 3.5 microns is found to be nearly parallel to the galactic plane, while that at 11.5 microns is approximately perpendicular to the plane. Possible origins of the wavelength-dependent orientation are discussed; grains in the spiral arms are suggested as the cause of polarization in the near-infrared sources, but the 11.5-micron flux is probably polarized by grains in or near the infrared sources of Sgr A. These conclusions concerning the polarization by grains lead to some estimates of the magnetic field alignment of the particles; the data suggest that a more efficient alignment mechanism than that provided by Davis-Greenstein (1951) may be in effect.

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