Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jhu..reptq....k&link_type=abstract
Progress Report Johns Hopkins Univ., Baltimore, MD. Dept. of Physics and Astronomy.
Astronomy and Astrophysics
Astrophysics
Astrodynamics, Cooling Flows (Astrophysics), Galactic Clusters, Galactic Mass, Rosat Mission, X Ray Spectra, Cold Gas, Mass Distribution, Neutral Gases, Temperature Gradients
Scientific paper
As a part of a program to determine the mass distribution of cD galaxy clusters with cooling flows, we obtained a ROSAT image of the cluster A 496. The image reveals sharply peaked emission centered on the cD galaxy. Both the peaked cooling flow emission and the more extended emission filling the cluster are centered on the cD galaxy to within 15 sec. The surface brightness profile is consistent with previous Einstein HRI observations. We measure spatially resolved spectra for the x-ray emission, and find a significant decline in temperature in the innermost 2 to 4 min. We also find a gradient in absorption due to cold neutral gas, with excess absorption, however, is far below previously reported values. We caution that this is a progress report, and that our results are preliminary.
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