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2002ApJ...565..195S - Astrophys. J., 565, 195-207 (2002/January-3)
A Chandra X-ray study of Cygnus A. III. The cluster of galaxies.
SMITH D.A., WILSON A.S., ARNAUD K.A., TERASHIMA Y. and YOUNG A.J.
Abstract (from CDS):
We have deprojected the X-ray spectra taken from 12 elliptical and circular annuli in order to derive a run of temperature, metallicity, density, and pressure as a function of radius. The temperature of the X-ray-emitting gas drops from ≃8 keV more than 100 kpc from the center to ≃5 keV some 80 kpc 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, while the limb-brightened edges of the cavity are slightly hotter (≃6 keV), perhaps as a result of heating by a bow shock driven by the probably expanding cavity into the intracluster gas. There is a metallicity gradient in the X-ray-emitting gas, with the highest metallicities (∼solar) found close to the center, decreasing to ∼0.3 times solar in the outer parts. We have used the assumption of hydrostatic equilibrium to derive a total cluster mass within 500 kpc of 2.0x1014M☉ and 2.8x1014M☉ for constant and centrally decreasing temperature profiles, respectively. The total mass of X-ray-emitting gas within the same radius is 1.1x1013M☉. Thus, the gas fraction of the cluster within 500 kpc is 0.055 and 0.039 for the constant and centrally decreasing temperature profiles, respectively.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Abundances - Galaxies: Clusters: Individual: Name: Cygnus A - Galaxies: Individual: Name: Cygnus A - Galaxies: Intergalactic Medium - X-Rays: Galaxies: Clusters - X-Rays: Individual: Constellation Name: Cygnus A
Simbad objects: 2
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