Effects of the reheating of the intergalactic gas on the collapse of late density perturbations

Details Effects of the reheating of the intergalactic gas on the collapse of late density perturbations Effects of the reheating of the intergalactic gas on the collapse of late density perturbations

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....40..387m&link_type=abstract

Astronomy and Astrophysics, vol. 40, no. 4, May 1975, p. 387-390.

Astronomy and Astrophysics

Astrophysics

1

Galactic Evolution, Gas Heating, Gravitational Collapse, Hydrogen Clouds, Intergalactic Media, Cosmology, Density Distribution, Galactic Clusters, Gas Temperature, Thermal Instability, X Ray Sources

Scientific paper

The influence of reheating of intergalactic gas on the collapse of late density perturbations is studied in the approximation of spherical symmetry. It is found that if the intergalactic-gas temperature is greater than 50,000 K out to a redshift of at least 2, the collapse is adiabatic and is stopped by the rise in internal pressure. Since the masses able to collapse are of the order of clusters of galaxies, the temperatures reached in the collapse are in the range from 1 million to 100 million K. These giant clouds of gas emit mostly X-rays with energies between 10 to the 44th power and 10 to the 47th power erg/s for at least one-tenth of the Hubble time. Over this time scale, thermal instabilities could lead to the formation of galaxies in the inner regions of the cloud. It is suggested that high-galactic-latitude sources in the Uhuru catalog, unidentified optically, could be interpreted as hot intergalactic clouds.

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