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X-ray Properties of the Abell 644 Cluster of Galaxies | | F. E. Bauer
; C. L. Sarazin
; | | Date: |
15 Sep 1999 | | Subject: | astro-ph | | Abstract: | We use new ASCA observations and archival ROSAT Position Sensitive Proportional Counter (PSPC) data to determine the X-ray spectral properties of the intracluster gas in Abell 644. From the overall spectrum, we determine the average gas temperature to be 8.64 (+0.67,-0.56) keV, and an abundance of 0.32 (+/-0.04) $Z_{odot}$. The global ASCA and ROSAT spectra imply a cooling rate of 214 (+100,-91) $M_{odot}$ yr$^{-1}$. The PSPC X-ray surface brightness profile and the ASCA data suggest a somewhat higher cooling rate. We determine the gravitational mass and gas mass as a function of radius. The total gravitating mass within 1.2 Mpc is $6.2 imes10^{14}$ $M_{odot}$, of which 20% is in the form of hot gas. There is a region of elevated temperature 1.5-5 arcmin to the west of the cluster center. The south-southwest region of the cluster also shows excess emission in the ROSAT PSPC X-ray image, aligned with the major axis of the optical cD galaxy in the center of the cluster. We argue that the cluster is undergoing or has recently undergone a minor merger. The combination of a fairly strong cooling flow and evidence for a merger make this cluster an interesting case to test the disruption of cooling flow in mergers. | | Source: | arXiv, astro-ph/9909274 | | Services: | Forum | Review | PDF | Favorites | |
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