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Hot Electrons and Cold Photons: Galaxy Clusters and the Sunyaev-Zel'dovich Effect

Published online by Cambridge University Press:  25 May 2016

J.P. Hughes
J.P. Hughes*
Affiliation:
Rutgers University Department of Physics and Astronomy P.O. Box 849, Piscataway, NJ 08855-0849 USA

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The hot gas in clusters of galaxies emits thermal bremsstrahlung emission that can be probed directly through measurements in the X-ray band. Another probe of this gas comes from its effect on the cosmic microwave background radiation (CMBR): the hot cluster electrons inverse Compton scatter the CMBR photons and thereby distort the background radiation from its blackbody spectral form. Although this, the Sunyaev-Zel'dovich (SZ) effect, is quite small, heroic efforts during the 1980's resulted in its detection in three moderately distant clusters of galaxies: A665, A2218, and CL 0016+16. It is well known that one of the purposes of conducting such measurements is to determine the Hubble constant. The technique has generated considerable interest because it is independent of all other rungs of the cosmic distance ladder and is effective over a wide range of redshifts: ~0.02 to ~1.

Type
Session 4: Large Scale Hot Plasmas and Their Relation with Dark Matter
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 189 - 192
Copyright
Copyright © Kluwer 1998 

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