Limits on cosmic dust densities by observations of the microwave background

Details Limits on cosmic dust densities by observations of the microwave background Limits on cosmic dust densities by observations of the microwave background

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....53..383w&link_type=abstract

Astronomy and Astrophysics, vol. 53, no. 3, Dec. 1976, p. 383-388. Research supported by the National Research Council of Canad

Astronomy and Astrophysics

Astrophysics

3

Background Radiation, Cosmic Dust, Intergalactic Media, Interstellar Matter, Microwave Spectra, Particle Density (Concentration), Cosmology, Density (Number/Volume), Dielectric Properties, Galactic Clusters, H Ii Regions, Hydrogen Atoms, Isotropism, Nonthermal Radiation, Plasma Temperature

Scientific paper

A previous method of finding limits on the density of dielectric dust grains in space is refined. Dipole radiation from dust in a hot plasma would give anisotropies in the microwave background. The absence of anisotropies at a temperature-anisotropy level of about 0.001 allows the method to be used in a first approximation to get limits on dust density as a function of grain radius for grain radii of 1 ten-millionth to 1 hundred-thousandth of a centimeter in H I and H II regions, the Galaxy, and the halo. The isotropy limit is calculated for rich clusters containing hot gas, and the technique is modified to obtain a limit on the density of dust in the Metagalaxy which is several orders better than previous estimates using dust-grain obscuration methods. It is concluded that intergalactic dust cannot close the Universe and that nonthermal radiation from dust is not responsible for any significant part of the cosmological background.

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