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Intracluster Entropy from Joint X‐Ray and Sunyaev‐Zel’dovich Observations
- Source :
- The Astrophysical Journal. 634:784-792
- Publication Year :
- 2005
- Publisher :
- American Astronomical Society, 2005.
-
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 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.<br />9 pages, 2 figures, uses REVTeX4 + emulateapj.cls and apjfonts.sty. Accepted by ApJ
- Subjects :
- Physics
X-Rays: Galaxies: Clusters
Astrophysics (astro-ph)
Cosmic microwave background
X-ray
FOS: Physical sciences
Cosmology: Cosmic Microwave Background
Astronomy and Astrophysics
Observable
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Galaxy groups and clusters
Settore FIS/05 - Astronomia e Astrofisica
Space and Planetary Science
Intracluster medium
Thermal state
Surface brightness
Scaling
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 634
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....50483bfc7cb7a5d36b4a60a7d7135889
- Full Text :
- https://doi.org/10.1086/496967