Comptonization of the Cosmic Microwave Background by Gas in Superclusters of Galaxies

Details Comptonization of the Cosmic Microwave Background by Gas in Superclusters of Galaxies Comptonization of the Cosmic Microwave Background by Gas in Superclusters of Galaxies

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418....1r&link_type=abstract

Astrophysical Journal v.418, p.1

Astronomy and Astrophysics

Astronomy

12

X-Rays: Galaxies, Cosmology: Cosmic Microwave Background, Galaxies: Clustering, Radiation Mechanisms: Miscellaneous

Scientific paper

Our systematic X-ray searches in the HEAO 1 A-2 database have yielded -- for the first time -- a direct bound on the properties of hot gas in superclusters (SCs) of galaxies. The bound translates to a mean Comptonization parameter whose value is lower than a few × 10-7 in a SC. The implied anisotropy in the spatial distribution of the cosmic microwave background (CMB) radiation due to gas in SCs is ΔT/T ≤ 10-7 on a characteristic angular scale of a few degrees. CMB Comptonization by gas in SCs is an unlikely source of the anisotropy on scales of ˜10° detected by COBE.

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