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Intracluster Entropy from Joint X-Ray and Sunyaev-Zel'dovich Observations

Cavaliere, A.
•
Lapi, A.
•
Rephaeli, Y.
2005
  • journal article

Periodico
THE ASTROPHYSICAL JOURNAL
Abstract
The temperature and density of the hot diffuse medium pervading galaxy groups and clusters combine into one significant quantity, the entropy. Here we express the entropy levels and profiles in model-independent forms by joining two observables: the X-ray luminosity and the change in the cosmic microwave background (CMB) intensity due to the Sunyaev-Zel'dovich (SZ) effect. Thus we present both global scaling relations for the entropy levels from clusters and groups, and a simple expression yielding the entropy profiles in individual clusters from resolved X-ray surface brightness and SZ spatial distributions. We propose that our approach provides two useful tools for comparing large data samples with models, in order to probe the processes that govern the thermal state of the hot intracluster medium. The feasibility of using such a diagnostic for the entropy is quantitatively assessed, based on current X-ray and upcoming SZ measurements.
DOI
10.1086/496967
WOS
WOS:000233577700006
Archivio
http://hdl.handle.net/20.500.11767/12948
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-29244464666
https://arxiv.org/abs/astro-ph/0508287
Diritti
closed access
Soggetti
  • Cosmology: Cosmic Mic...

  • X-Rays: Galaxies: Clu...

  • Settore FIS/05 - Astr...

Scopus© citazioni
8
Data di acquisizione
Jun 14, 2022
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Web of Science© citazioni
8
Data di acquisizione
Mar 24, 2024
Visualizzazioni
1
Data di acquisizione
Apr 19, 2024
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