Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-09
Astronomy and Astrophysics
Astrophysics
7 pages, 8 figures, Accepted for publication in A&A (special Letter issue on XMM)
Scientific paper
10.1051/0004-6361:20000017
Using the PV observation of A1795, we illustrate the capability of XMM-EPIC to measure cluster temperature profiles, a key ingredient for the determination of cluster mass profiles through the equation of hydrostatic equilibrium. We develop a methodology for spatially resolved spectroscopy of extended sources, adapted to XMM background and vignetting characteristics. The effect of the particle induced background is discussed. A simple unbiased method is proposed to correct for vignetting effects, in which every photon is weighted according to its energy and location on the detector. We were able to derive the temperature profile of A1795 up to 0.4 times the virial radius. A significant and spatially resolved drop in temperature towards the center (r<200 kpc) is observed, which corresponds to the cooling flow region of the cluster. Beyond that region, the temperature is constant with no indication of a fall-off at large radii out to 1.2 Mpc.
Aghanim Nabila
Arnaud Monique
Gastaud Rene
Hughes John Patrick
Majerowicz Sebastien
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