The X-ray spectra of clusters of galaxies

Details The X-ray spectra of clusters of galaxies The X-ray spectra of clusters of galaxies

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979nw.....66..433c&link_type=abstract

Naturwissenschaften, Volume 66, Issue 9, pp.433-437

Astronomy and Astrophysics

Astronomy

Scientific paper

The identification of extended sources of X-ray emission associated with clusters of galaxies has been one of the major achievements of X-ray astronomy. In this paper the present situation regarding the identification of X-ray clusters is reviewed and the relationship between X-ray and optical cluster properties is briefly discussed. Measurements of X-ray extent have been made for a small number of clusters and the status of these observations is described. The nature of the X-ray emission process and the observations which have led to our present understanding of cluster X-ray production are examined in some detail. Observations at other wavelengths that are relevant to this problem are also discussed. The available evidence suggests that the X-ray emission is due to bremsstrahlung from high-temperature ( T>2·107 K) gas that is present in the space between cluster galaxies. Current models of the origin of this gas and of its likely heating mechanism are presented.

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