The dependence of the extinction ratio on galactic longitude

Details The dependence of the extinction ratio on galactic longitude The dependence of the extinction ratio on galactic longitude

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.180...29w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 180, July 1977, p. 29-35. Research supported by the Science Research Co

Astronomy and Astrophysics

Astronomy

28

Galactic Radiation, Interstellar Extinction, Longitude, Milky Way Galaxy, Polarization Characteristics, Astronomical Maps, Cosmic Dust, Galactic Structure, Ratios, Spatial Dependencies, Spiral Galaxies

Scientific paper

Evidence is presented for a small but significant variation in the ratio of total to selective extinction, R, with galactic longitude. R is found to be systematically higher by about 0.3 in the southern Milky Way than in the North, a conclusion which is supported by a study of variations in the wavelength of maximum polarization. The polarization data suggest a sinusoidal dependence of R on galactic longitude and the amplitude of the variation. The most probable explanation of this effect is a variation in the mean size of the dust grains in the local spiral arm.

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