Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..981a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Dec. 15, 1984, p. 981-989.
Astronomy and Astrophysics
Astronomy
110
Galactic Clusters, Intergalactic Media, Interstellar Gas, Radio Galaxies, X Ray Astronomy, Astronomical Maps, Cooling, Electron Density (Concentration), Heao 2, High Temperature Gases, Nonthermal Radiation
Scientific paper
Einstein Observatory X-ray observations show that the radio source Cygnus-A lies at the centre of about 1014M_sun; of hot gas. In one direction this gas extends to over 1 Mpc from the radio source, a size comparable with previously observed large X-ray clusters. Gas out to a radius of 125 kpc has a cooling time of less than a Hubble time leading to a cooling flow of about 90 M_sun;yr-1. The hot gas has an r-1 density profile giving an age of less than 2×107yr for a constant power input from the beam. The hotspot advance speed is found to be greater than 0.011 c, using recently published estimates of the pressure in the radio hotspots. Present X-ray observations are not able to detect the shocked gas confining the radio plasma.
Arnaud A. A. K.
Eales Stephen A.
Fabian Andrea C.
Forman William
Jones Christine
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