Superclusters are warm, not hot - The predicted flux distribution of soft X-rays

Details Superclusters are warm, not hot - The predicted flux distribution of soft X-rays Superclusters are warm, not hot - The predicted flux distribution of soft X-rays

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.251p..41k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 251, July 15, 1991, p. 41P-45P.

Astronomy and Astrophysics

Astronomy

15

Baryons, Dark Matter, Rosat Mission, Star Clusters, X Ray Astronomy, Astronomical Models, Intergalactic Media

Scientific paper

Arguments showing that gas present in superclusters should have a characteristic temperature of approximately 10 to the 6th K are presented. In the most popular models of large-scale structure formation, including hot and cold dark matter, peculiar velocities of matter relative to the background are of about 1000 km/s. This would imply temperatures exceeding 10 to the 7th K. However, most of the peculiar motions can be attributed to large-scale, coherent velocities. Moreover, gas inside superclusters which is not concentrated in groups or clusters will cool adiabatically with the Hubble expansion. A temperature of 10 to the 6th K implies that radiation from gas in superclusters should not be seen in X-rays of energy greater than 500 eV. The most favorable range for observing this radiation is about 100-300 eV. The results of numercial simulations of the evolution of large-scale structure in a cold dark matter scenario including the thermal history of the baryonic component are presented. These simulations provide estimates of the flux, together with examples of patterns as they would appear in the data. Soft X-rays emitted from hot gas in known superclusters may be detectable at the limits of sensitivity of ROSAT by averaging counts over a sufficiently large region.

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