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Title:
Chandra temperature and metallicity maps of the Perseus cluster core
Authors:
Schmidt, R. W.; Fabian, A. C.; Sanders, J. S.
Affiliation:
AA(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;), AB(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;), AC(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA;)
Publication:
Monthly Notice of the Royal Astronomical Society, Volume 337, Issue 1, pp. 71-78. (MNRAS Homepage)
Publication Date:
11/2002
Origin:
MNRAS
MNRAS Keywords:
galaxies: clusters: general, galaxies: clusters: individual: Abell 426, cooling flows, intergalactic medium, X-rays: galaxies
DOI:
10.1046/j.1365-8711.2002.05804.x
Bibliographic Code:
2002MNRAS.337...71S

Abstract

We present temperature and metallicity maps of the Perseus cluster core obtained with the Chandra X-ray Observatory. We find an overall temperature rise from ~3.0 keV in the core to ~5.5 keV at 120 kpc and a metallicity profile that rises slowly from ~0.5 solar to ~0.6 solar inside 60 kpc, but drops to ~0.4 solar at 120 kpc. Spatially resolved spectroscopy in small cells shows that the temperature distribution in the Perseus cluster is not symmetrical. There is a wealth of structure in the temperature map on scales of ~10 arcsec (5.2 kpc) showingswirliness and a temperature rise that coincides with a sudden surface brightness drop in the X-ray image. We obtain a metallicity map of the Perseus cluster core and find that the spectra extracted from the two central X-ray holes as well as the western X-ray hole are best-fit by gas with higher temperature and higher metallicity than is found in the surroundings of the holes. A spectral deprojection analysis suggests, however, that this is due to a projection effect; for the northern X-ray hole we find tight limits on the presence of an isothermal component in the X-ray hole, ruling out volume-filling X-ray gas with temperatures below 11 keV at 3σ.

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