Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234....1p&link_type=abstract
Astrophysical Journal, Part 1, vol. 234, Nov. 15, 1979, p. 1-12.
Astronomy and Astrophysics
Astronomy
34
Galactic Clusters, Intergalactic Media, Spaceborne Astronomy, X Ray Sources, X Ray Spectra, Halos, Heao 1, Microwave Spectra, Stellar Luminosity
Scientific paper
HEAO A-2 X-ray observations of rich clusters, extended halos around clusters, and superclusters are discussed. Concerning the optically richest clusters, results in the 0.2-60 keV energy range show that they appear to be relatively underluminous in X-rays. It is found that X-ray and microwave measurements for some rich clusters and for Abell 576 can be used to meaningfully constrain intracluster gas parameters and H(0); in addition, observations of Abell 576 show its luminosity to be less than earlier estimates. Extended halos around clusters were not detected in the data, and spectral observations of Abell 401 and 2147 reveal that they have typical cluster spectra with iron-line emission, while intensity measurements indicate that supercluster X-ray emission is not required.
Boldt Elihu A.
Marshall Francis E.
McKee James
Mushotzky Richard F.
Pravdo Steven Howard
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