Search for X-ray emission from rich clusters, extended halos around clusters, and superclusters

Journal Article · Thu Nov 15 04:00:00 EST 1979 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/157467· OSTI ID:5543453

Pravdo, S H; Boldt, E A; Marshall, F E; McKee, J; Mushotzky, R F; Smith, B W; Reichert, G

The all-sky data base acquired with the HEAO A-2 experiment has been searched for X-ray emission on a variety of metagalactic size scales which had wither been predicted or previously detected. We present results in 0.2--60 keV energy range. The optically richest clusters, including those from which a microwave decrement has been observed, appear to be relatively underluminous in X-rays. Observations of Abell 576 show its luminosity to be less than earlier estimates and, moreover, less than the luminosity predicted from its microwave decrement, unless the intracluster gas is a factor of approx.10 hotter than in typical clusters.Extended halos around clusters were not detected in our data, and weak sources appear to be responsible for the apparent effect around several clusters. Near SC 0627 there are two X-ray sources, and the identification of the dominant source with SC 0627 is probably incorrect.New spectral observations of Abell 401 and 2147, possible superclusters, reveal that they have typical cluster spectra with iron-line emission. Our substantially lower intensities for the 4U supercluster candidates indicate that there is no requirement for supercluster X-ray emission above the contribution of the member clusters.

• Research Organization: Laboratory for High Energy Astrophysics, NASA Goddard Space Flight Center, Greenbelt, Maryland
• OSTI ID: 5543453
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 233:4; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC PHOTONS
COSMIC RADIATION
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
GALAXY CLUSTERS
INTERGALACTIC SPACE
IONIZING RADIATIONS
MASSLESS PARTICLES
MICROWAVE RADIATION
PHOTONS
RADIATIONS
SPACE
SPECTRA
X-RAY SPECTRA