SPARTAN 1 X-ray observations of the Perseus cluster. II - The distribution of flux and hardness ratio out to a radius of 50 arcminutes

Details SPARTAN 1 X-ray observations of the Perseus cluster. II - The distribution of flux and hardness ratio out to a radius of 50 arcminutes SPARTAN 1 X-ray observations of the Perseus cluster. II - The distribution of flux and hardness ratio out to a radius of 50 arcminutes

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..460s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 460-470.

Astronomy and Astrophysics

Astronomy

16

Galactic Clusters, Galactic Radiation, X Ray Astronomy, X Ray Sources, Brightness Distribution, Radial Distribution, Spartan Satellites

Scientific paper

The 1-10 keV X-ray observations of the Perseus Cluster by Spartan 1 have yielded a map of the X-ray emission and the distribution of X-ray hardness ratio with radius from the cluster center. The surface brightness contours are approximately circular within 10 arcmin of the center, but outside this radius become increasingly elongated so that the major axis/minor axis ratio reaches 1.2 beyond 20 arcmin. The position angle of the major axis is about 84-deg east of north within 20 arcmin, consistent with optical results, but may shift to approximately 70 deg at larger radii. The centroid of the X-ray emission lies 2.4 arcmin east of NGC 1275. Also, at radii greater than 20 arcmin in the southeast, coincident with the line of bright galaxies between NGC 1275 and IC 310, there is an enhancement in the X-ray surface brightness. These asymmetries may be evidence that outside 10 arcmin the cluster has not reached dynamic equilibrium. Using a spherically symmetric model, it is found that the intracluster gas is approximately isothermal between radii of 10 arcmin and 50 arcmin, consistent with a temperature of 7.5 + or - 0.5 x 10 to the 7th K.

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