Comptonization of the cosmic microwave background by gas in superclusters of galaxies

Yoel Rephaeli*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)1-3
Number of pages3
JournalAstrophysical Journal
Volume418
Issue number1
DOIs
StatePublished - 20 Nov 1993

Keywords

  • Cosmic microwave background
  • Galaxies: clustering
  • Miscellaneous
  • Radiation mechanisms
  • X-rays: galaxies

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