Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-09
Astron.Astrophys. 433 (2005) 101-111
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy and Astrophysics. 14 pages, 8 two columns figures in this version
Scientific paper
10.1051/0004-6361:20041888
We investigate temperature and entropy profiles of 13 nearby cooling flow clusters observed with the EPIC cameras of XMM-Newton. When normalized and scaled by the virial radius the temperature profiles turn out to be remarkably similar. At large radii the temperature profiles show a clear decline starting from a break radius at ~ 0.1 r_vir. The temperature decreases by ~30 % between 0.1 r_vir and 0.5 r_vir. As expected for systems where non-gravitational processes are of great importance, the scale length characterizing the central temperature drop is not found to be proportional to the virial radius of the system. The entropy of the plasma increases monotonically moving outwards almost proportional to the radius and the central entropy level is tightly correlated with the core radius of the X-ray emission. The dispersion in the entropy profiles is smaller if the empirical relation S \propto T^{0.65} is used instead of the standard self-similar relation S \propto T and, as expected for cooling flow clusters, no entropy cores are observed.
Jetzer Philippe
Kaastra Jelle
Piffaretti Rocco
Tamura Takayuki
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