Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265....9f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 9-18.
Astronomy and Astrophysics
Astronomy
48
Gas Pressure, Intergalactic Media, Radio Galaxies, Spatial Distribution, Radio Astronomy, Radio Sources (Astronomy), Radio Spectra, Spectrum Analysis, X Ray Astronomy, X Rays
Scientific paper
The study analyzes a sample of tailed radio galaxies in Abell clusters in order to estimate their internal pressure under the assumption that their tails are in static equilibrium with the thermal pressure of the ambient X-ray emitting gas. When projection effects are not taken into account, the external pressure Pth is a factor from 5 to 100 larger than the minimum internal nonthermal pressure, Peq, evaluated under equipartition conditions with a volume filling factor and a ratio between relativistic protons and electrons both equal to one. A statistical method is developed to take the projection effects into account. The internal pressure is set equal to s x Peq, with s as a free parameter, and the distance of each galaxy from the cluster center is determined by imposing s x Peq - Pth, where Pth is inferred from the available X-ray data. Acceptable values of s fall in the range 5-10. The implications of this result are briefly discussed.
Fanti Roberto
Feretti Luigina
Perola Giuseppe Cesare
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