Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..177w&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 2, Oct. 1977, p. 177-180. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astrophysics
3
Cosmic Dust, Galactic Clusters, High Temperature Plasmas, Intergalactic Media, Microwave Emission, Density Distribution, Spatial Distribution
Scientific paper
The hot intracluster plasma of certain rich clusters of galaxies leads to the charging of dielectric dust grains immersed in the gas. A saturation level is obtained for the application of Spitzer's (1968) charged-dust relation for grains. This is used to obtain the intensity of dipole microwave emission from the spinning dust grains. The emission rate is compared with limits on the isotropy of the microwave background to derive a limit on the density of otherwise-undetectable small dust grains (grain radius not larger than about 10 nm) in the Coma cluster. It is found that a dust medium composed of particles of glass or material of greater conductivity and of density up to 10 to the -24th power kg/cu m could be present in Coma. This may provide enough hidden matter to bind this and similar clusters.
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