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Title:
Spatially resolved X-ray spectroscopy of the core of the Centaurus cluster
Authors:
Sanders, J. S.; Fabian, A. C.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 331, Issue 2, pp. 273-283. (MNRAS Homepage)
Publication Date:
03/2002
Origin:
MNRAS
MNRAS Keywords:
galaxies: clusters: individual: Centaurus, cooling flows, intergalactic medium, X-rays: galaxies
DOI:
10.1046/j.1365-8711.2002.05211.x
Bibliographic Code:
2002MNRAS.331..273S

Abstract

We present Chandra data from a 31.7-ks observation of the Centaurus cluster, using the ACIS-S detector. Images of the X-ray emission show a plume-like feature at the centre of the cluster, of extent 60arcsec (20kpc in projection). The feature has the same metallicity as gas at a similar radius, but is cooler. Using adaptive binning, we generate temperature, abundance and absorption maps of the cluster core. The radial abundance profile shows that the previously known, steep abundance gradient peaks with a metallicity of 1.3-1.8Zsolar at a radius of about 45arcsec (15kpc), before falling back to 0.4Zsolar at the centre of the cluster. A radial temperature profile shows that the temperature decreases inwards. We determine the spatial distributions of each of two temperature components, where applicable. The radiative cooling time of the cooler component within the inner 10arcsec (3kpc) is less than 2×107yr. X-ray holes in the image coincident with the radio lobes are seen, as well as two outer sharp temperature drops, or cold fronts. The origin of the plume is unclear. The existence of the strong abundance gradient is a strong constraint on extensive convection or gas motion driven by a central radio source.

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