The intracluster gas around Cygnus-A
Open Access
- 1 December 1984
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 211 (4) , 981-989
- https://doi.org/10.1093/mnras/211.4.981
Abstract
Einstein Observatory X-ray observations show that the radio source Cygnus-A lies at the centre of about 1014M⊙ 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⊙ yr−1. The hot gas has an r−1 density profile giving an age of less than 2×107 yr 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.Keywords
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