A dust model for M82 - Constraints on the nature of intergalactic dust

Details A dust model for M82 - Constraints on the nature of intergalactic dust A dust model for M82 - Constraints on the nature of intergalactic dust

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..125a&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 125-130. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

1

Astronomical Models, Cosmic Dust, Galactic Radiation, Intergalactic Media, Light Scattering, Galactic Nuclei, Infrared Radiation, Velocity Distribution

Scientific paper

A dust model for light scattering in the halo of the irregular II galaxy M82 is constructed based on the assumption that the galaxy is moving through an intergalactic dust cloud. Completely general expressions for the Stokes parameters of the light received by an observer are derived on the assumption that the galaxy is a point source. For a uniform dust density distribution, good agreement with polarization and intensity observations is possible only if the dust particles are small, needlelike, and metallic. Graphite and iron are considered as plausible candidates for the composition of the dust. For graphite, the model predicts a small reduction in polarization at infrared wavelengths compared with that at visible wavelengths. Also, if M82 is at a distance of 3.25 Mpc from the sun, then the thickness of the cloud is estimated to be 16 kpc. Better agreement with observations could result if gravitational infall of dust leads to multiple scattering near the nucleus of the galaxy.

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