2000ApJ...530..719W -
Astrophys. J., 530, 719-732 (2000/February-3)
X-ray-emitting atmospheres of B2 radio galaxies.
WORRALL D.M. and BIRKINSHAW M.
Abstract (from CDS):
We report ROSAT PSPC spatial and spectral analyses of the eight B2 radio galaxies NGC 315, NGC 326, 4C 35.03, B2 0326+39, NGC 2484, B2 1040+31, B2 1855+37, and 3C 449, expected to be representative of the class of low-power radio galaxies. Multiple X-ray components are present in each, and the gas components have a wide range of linear sizes and follow an extrapolation of the cluster X-ray luminosity/temperature correlation, implying that there is no relationship between the presence of a radio galaxy and the gas fraction of the environment. No large-scale cooling flows are found. There is no correlation of radio-galaxy size with the scale or density of the X-ray atmosphere. This suggests that processes on scales smaller than those of the overall gaseous environments are the major influence on radio-source dynamics. The intergalactic medium is usually sufficient to confine the outer parts of the radio structures, in some cases even to within 5 kpc of the core. In the case of NGC 315, an extrapolation suggests that the pressure of the atmosphere may match the minimum pressure in the radio source over a factor of ∼40 in linear size (a factor of ∼1600 in pressure).
Abstract Copyright:
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Journal keyword(s):
Galaxies: Active - Radiation Mechanisms: Nonthermal - Radio Continuum: Galaxies - X-Rays: Galaxies
Simbad objects:
11
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