Chandra And Rosat Observations Of Abell 194 cluster: Detection Of An X-ray Cavity And Mapping The Dynamics Of The Cluster

Details Chandra And Rosat Observations Of Abell 194 cluster: Detection Of An X-ray Cavity And Mapping The Dynamics Of The Cluster Chandra And Rosat Observations Of Abell 194 cluster: Detection Of An X-ray Cavity And Mapping The Dynamics Of The Cluster

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.4604b&link_type=abstract

American Astronomical Society, HEAD meeting #12, #46.04

Astronomy and Astrophysics

Astronomy

Scientific paper

Based on Chandra and ROSAT observations we investigated the poor cluster Abell 194, which hosts two luminous radio galaxies, NGC547 (3C 40) and NGC541 (PKS 0123-016A). We demonstrated the existence of a large X-ray cavity at the southern part of the cluster formed by the giant southern radio lobe arising from 3C 40. Using the parameters of the hot ICM, the extent and location of the cavity, we estimated the total work of the AGN, the age of the cavity, and the total cavity power. Furthermore, in the Chandra images of NGC545 and NGC541 we detected sharp surface brightness edges, identified as merger cold fronts, and extended tails. Using the pressure ratios between inside and outside the cold fronts, we estimated that NGC545 and NGC541 are moving with transonic velocities. The low radial velocities of these galaxies relative to the mean radial velocity of Abell 194 imply that their motion is oriented approximately in the plane of the sky. Based on these and earlier observations, we concluded that NGC547 is in the center of Abell 194 and NGC545 and NGC541 are falling through the cluster. These suggest that Abell 194 is undergoing a major cluster merger event.

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