The effect of hot gas in early-type galaxies on the cosmic microwave background

Details The effect of hot gas in early-type galaxies on the cosmic microwave background The effect of hot gas in early-type galaxies on the cosmic microwave background

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..605t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 605-609.

Astronomy and Astrophysics

Astrophysics

5

Compton Effect, High Temperature Gases, Interstellar Gas, Microwave Scattering, Relic Radiation, Dark Matter, Distribution Functions, Free Electrons, Submillimeter Waves

Scientific paper

The effects on the cosmic microwave background which are due to Compton scattering by the hot gas contained in early-type galaxies (the Sunyaev-Zeldovich effect) are computed. Using the known properties of the gas deduced from X-ray observations, it is found that the fractional attenuation DeltaT/T at the center of a gas-rich galaxy is likely to be less than 10 to the -5th, which is just below current limits of detectability. A distribution function is derived for the attenuation which is due to a population of early-type galaxies out to some redshift and the expected rms fluctuations in the background on subarcmin scales are computed. These fluctuations are comparable to those intrinsic to the microwave background in the 'cold dark matter' scenario on these angular scales, but they fall orders of magnitude below the detection limits and below the level of fluctuations expected from nonlinear density perturbations at the epoch of galaxy formation.

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