Physics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.194s&link_type=abstract
Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.
Physics
Clusters Of Galaxies
Scientific paper
The results from a recent Chandra ACIS-S study of the cluster surrounding Cygnus A are presented. We have deprojected the X-ray spectra taken from various elliptical shells in order to derive the run of temperature, density, pressure, and abundance for the ICM as a function of radius. We confirm a drop in temperature of the X-ray emitting gas from ~8 keV more than ~2' from the center to ~= 5 keV some 30'' from the center, with the coolest gas immediately adjacent to the radio galaxy. ``Belts'' of slightly cooler (~= 4 keV) X-ray emitting gas run around the minor dimension of the cavity created by the radio source. We find a metallicity gradient in the X-ray emitting gas, with the highest metallicities (~ solar) in the inner annuli, decreasing to ~0.3 solar in the outer parts. The total mass within 500 kpc is found to be (2.0-2.8) × 1014 Msolar and approximately 3.5-5% of the mass is X-ray emitting gas. Finally, we also determine the temperature of the X-ray emitting gas at the center of the on-going merger between the main cluster and a smaller cluster to the NW.
Smith Alastair D.
Wilson Andrew S.
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