Chandra observation of the core of the galaxy cluster AWM7

Details Chandra observation of the core of the galaxy cluster AWM7 Chandra observation of the core of the galaxy cluster AWM7

2003-06-17

arxiv.org/abs/astro-ph/0306331v1

Astrophys.J. 596 (2003) 181-189

Astronomy and Astrophysics

Astrophysics

12 pages, 7 figures (including color), accepted for publication in ApJ. Postscript is also available at http://www-x.phys.me

Scientific paper

10.1086/377532

We present results from a Chandra observation of the core region of the nearby X-ray bright galaxy cluster AWM7. There are blob-like substructures, which are seen in the energy band 2--10 keV, within 10 kpc (20'') of the cD galaxy NGC1129, and the brightest sub-peak has a spatial extent more than 4 kpc. We also notice that the central soft X-ray peak is slightly offset from the optical center by 1 kpc. These structures have no correlated features in optical, infrared, or radio band. Energy spectrum of the hard sub-peak indicates a temperature higher than 3 keV with a metallicity less than 0.3 solar, or a power-law spectrum with photon index 1.2. A hardness ratio map and a narrow Fe-K band image jointly indicate two Fe-rich blobs symmetrically located around the cD galaxy, with the direction perpendicular to the sub-peak direction. In larger scales (r<60 kpc), the temperature gradually drops from 4 keV to 2 keV toward the cluster center and the metal abundance rises steeply to a peak of 1.5 solar at r=7 kpc. These results indicate that a dynamical process is going on in the central region of AWM7, which probably creates heated gas blobs and drives metal injection.

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