Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-17
Astrophys.J. 619 (2005) 161-168
Astronomy and Astrophysics
Astrophysics
To be published in ApJ Jan. 20, 2005. The paper has been extensively revised and strengthened to comply with ApJ referee repor
Scientific paper
10.1086/426420
We have used a 50.4 ksec Chandra obsffervation to examine the galaxy cluster Abell 115 (z=0.1971). The X-ray surface brightness distribution shows a merger of 2 sub-clusters with substantial off-axis motion. The northern sub-cluster moves toward the southwest and exhibits a strong X-ray surface brightness gradient toward this direction as well as a "fan" of X-ray bright Intra-Cluster Medium (ICM) toward the northeast. The southern sub-cluster shows a pronounced northeast-southwest elongation, probably as a consequence of the ongoing merger. The temperature of the ICM is highly non-uniform across the cluster. Although the merger is well underway and has had a substantial influence on the morphology of the 2 sub-clusters, it has apparently not disturbed the cool sub-cluster cores. The ICM in between the sub-clusters has a significantly elevated temperature of ~8 keV. However, owing to the low surface brightness, we do not find direct evidence for shocks in this region. The X-ray surface brightness distribution of the northern sub-cluster is highly non-uniform. The data show a bright central core region of about 10" (30 kpc) diameter. A highly significant surface brightness discontinuity separates the core from the ambient ICM. We discuss several possibilities to explain the compact core, and its relation to the central radio galaxy 3C 28.0 and the sub-cluster's cooling flow. Further outwards, at about 24.6" (80 kpc) to the southwest of the sub-cluster core, the surface brightness distribution shows a jump associated with a contact discontinuity. The Chandra imaging spectroscopy data do not show evidence for a shock associated with the surface brightness jump. We conclude that it is associated with denser plasma moving sub-sonically through the ambient plasma.
Gutierrez Kris
Krawczynski Henric
No associations
LandOfFree
The Off-Axis Galaxy Cluster Merger Abell 115 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Off-Axis Galaxy Cluster Merger Abell 115, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Off-Axis Galaxy Cluster Merger Abell 115 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-592013