The angular broadening of compact radio sources observed through ionized gas in a rich cluster of galaxies

Details The angular broadening of compact radio sources observed through ionized gas in a rich cluster of galaxies The angular broadening of compact radio sources observed through ionized gas in a rich cluster of galaxies

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228l..15h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 228, Feb. 15, 1979, p. L15-L18.

Astronomy and Astrophysics

Astronomy

9

Galactic Clusters, Intergalactic Media, Ionized Gases, Magnetohydrodynamic Stability, Radio Sources (Astronomy), Anisotropy, Correlation, Diameters, Dimensional Measurement, Gas Flow, Radio Scattering

Scientific paper

A method is reported by which ionized gas in rich clusters of galaxies at high galactic latitude may be detected. The transonic motions of galaxies in clusters stir the intergalactic medium, inducing shear which gives rise to magnetohydrodynamic instabilities. One of these, the mirror instability, causes small-scale density inhomogeneities to develop, which grow to a level of about 3%. These have a typical scale length of 10 times the ion Larmor radius and would broaden the angular diameters of compact radio sources seen through them to about 0.13 (81.5/nu)-squared arcseconds at an observing frequency nu(in MHZ), for a gas density of approximately 0.001 per cu cm, temperature of about 100 million K, and ambient magnetic field of about 10 to the -7th gauss. Scattering in the Galaxy would be less important at high galactic latitudes.

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