The intracluster gas around Cygnus A.
Abstract
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- December 1984
- DOI:
- 10.1093/mnras/211.4.981
- Bibcode:
- 1984MNRAS.211..981A
- Keywords:
-
- Galactic Clusters;
- Intergalactic Media;
- Interstellar Gas;
- Radio Galaxies;
- X Ray Astronomy;
- Astronomical Maps;
- Cooling;
- Electron Density (Concentration);
- Heao 2;
- High Temperature Gases;
- Nonthermal Radiation;
- Astrophysics