Extragalactic diffuse neutral hydrogen clouds - Probes of a hot intergalactic medium

Details Extragalactic diffuse neutral hydrogen clouds - Probes of a hot intergalactic medium Extragalactic diffuse neutral hydrogen clouds - Probes of a hot intergalactic medium

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209l.105c&link_type=abstract

Astrophysical Journal, vol. 209, Nov. 1, 1976, pt. 2, p. L105-L109.

Astronomy and Astrophysics

Astronomy

19

Galaxies, Hydrogen Clouds, Intergalactic Media, Bremsstrahlung, Gas Temperature, Microwave Emission, X Ray Astronomy

Scientific paper

Extragalactic diffuse neutral hydrogen clouds constitute a probe of the intergalactic gas by both thermal and dynamical interaction with the surrounding medium. Clouds recently discovered by Mathewson et al., (1975) in the Sculptor group place stringent limits on the density and temperature of any intergalactic gas unless the clouds are very highly clumped. The existence of such clouds is probably inconsistent with a thermal bremsstrahlung interpretation of the 30-keV feature in the spectrum of the isotropic X-ray background. Future high-resolution 21-cm studies of the clouds are suggested which should be capable of determining whether a hot dense intergalactic medium does indeed exist.

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