Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-21
Astrophys.J.567:1-18,2002
Astronomy and Astrophysics
Astrophysics
20 pages, 12 figures and 5 tables included. To appear in ApJ, March 1 2002, minor changes in revised version
Scientific paper
10.1086/340627
We report results from the analysis of 21 nearby galaxy clusters, 11 with cooling flow (CF) and 10 without cooling flow, observed with BeppoSAX. The temperature profiles of both CF and non-CF systems are characterized by an isothermal core extending out to 0.2 r_180; beyond this radius both CF and non-CF cluster profiles rapidly decline. Our results differ from those derived by other authors who either found continuously declining profiles or substantially flat profiles. Neither the CF nor the non-CF profiles can be modeled by a polytropic temperature profile, the reason being that the radius at which the profiles break is much larger than the core radius characterizing the gas density profiles. For r > 0.2 r_180, where the gas can be treated as a polytrope, the polytropic indices derived for CF and non-CF systems are respectively 1.20 +/- 0.06 and 1.46 +/- 0.06. The former index is closer to the isothermal value, 1, and the latter to the adiabatic value, 5/3. Published hydrodynamic simulations do not reproduce the peculiar shape of the observed temperature profile, probably suggesting that a fundamental ingredient is missing.
de Grandi Sabrina
Molendi Silvano
No associations
LandOfFree
Temperature Profiles of Nearby Clusters of Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Temperature Profiles of Nearby Clusters of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature Profiles of Nearby Clusters of Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-292900