X-ray observations of the Ophiuchus, PKS 0745–191 and Cygnus-A clusters of galaxies
Open Access
- 1 July 1987
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 227 (1) , 241-256
- https://doi.org/10.1093/mnras/227.1.241
Abstract
We report observations of the X-ray emission from three bright clusters of galaxies at low Galactic latitudes; the Ophiuchus, PKS0745–191 and Cygnus-A clusters. Temperatures and iron abundances are determined from EXOSAT spectral data. Images of the Ophiuchus cluster show it-to have a high central density and a cooling flow. We confirm measurements of a high gas density around PKS 0745–191 and show that the X-ray emission is centred on the radio galaxy. The PKS 0745–191 cluster is the most distant object for which an abundance has been measured from X-ray spectra. The spectrum of Cygnus-A contains a highly absorbed power-law component that we identify with the nucleus of the radio source.Keywords
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