Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..433s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Dec. 1, 1990, p. 433-443.
Astronomy and Astrophysics
Astronomy
16
Galactic Clusters, Galactic Nuclei, Galactic Radiation, X Ray Sources, Brightness Distribution, Proportional Counters, X Ray Astronomy, X Ray Imagery
Scientific paper
A search for small-scale structure in the X-ray surface brightness of 20 nearby (z not greater than 0.036) clusters of galaxies is described. The technique is to compare 0.3-3.5 keV observations made with the IPC aboard the Einstein Observatory to detailed simulations of intrinsically smooth clusters. Excess fluctuations of 1-deg scale are detected in the high-count sample, but none in the low-count sample. The excess fluctuations in the high-count sample could be produced by about one source per zone emitting at about 4 x 10 to the 41st ergs/s in soft X-rays. It is suggested that low-luminosity active nuclei in the cluster galaxies or a hot interstellar medium retained by some galaxies are the most likely origins of this emission.
Fabricant Daniel G.
Soltan Andrzej
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