Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..661s&link_type=abstract
(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews
Astronomy and Astrophysics
Astronomy
3
Elliptical Galaxies, Exosat Satellite, Virgo Galactic Cluster, X Ray Astronomy, Brightness Distribution, Line Spectra, Luminosity, X Ray Sources
Scientific paper
A series of observations of the Virgo cluster of galaxies with the Medium Energy experiment aboard Exosat are presented. These take the form of two orthogonal scans meeting at M87. The observed count rates have been compared with those obtained with the IPC aboard the Einstein observatory and are found to be consistent with the IPC surface brightness distribution. This fact, together with spectral data obtained with Exosat, indicates that the region around M87 is more or less isothermal (T approximately 2-3 keV) out to more than 80 arcmin from the center. Although a slight hardening is seen near the optical centroid of the cluster, the results do not support a model which involves a hot (approximately 8 keV) intracluster medium. A mass of approximately 5 x 10 to the 13th solar masses is derived for the inner 90 arcmin of M87.
Smith Aaron
Stewart Gay
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