X-ray-emitting Atmospheres of B2 Radio Galaxies

Abstract

We report ROSAT PSPC spatial and spectral analysis 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 it is processes on scales less than those of the overall gaseous environments which 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 about 40 in linear size (a factor of about 1600 in pressure).

34 pages, including 10 figures, using aasms4.sty To appear in the ApJ

References in corpus (4)

• ROSAT X-ray observations of 3CRR radio sources
• X-ray observations of low-power radio galaxies from the B2 catalogue
• Extended X-ray emission from the BL Lac object PKS 0521-365
• Redshift and velocity dispersion of the cluster of galaxies around NGC 326

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