HEAO 1 high energy X-ray observations of the Virgo cluster and A2142

Details HEAO 1 high energy X-ray observations of the Virgo cluster and A2142 HEAO 1 high energy X-ray observations of the Virgo cluster and A2142

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..369l&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 369-375. Research supported by Bell Telephone Laboratories

Astronomy and Astrophysics

Astronomy

38

Heao 1, Intergalactic Media, Interstellar Magnetic Fields, Virgo Galactic Cluster, X Ray Sources, Galactic Nuclei, Galactic Radiation, Oso-8, Photons, Spaceborne Astronomy, Thermal Radiation, Variability, X Ray Spectra

Scientific paper

Observations are reported of the Virgo cluster and Abell 2142 in the energy range of 15-150 keV, detected by using hard X-ray and low energy gamma-ray instruments on board the HEAO-1 spacecraft, during 1977 and 1978. The Virgo cluster was detected at a mean flux of (1.3 + or - 0.3) x 10 to the 0.001 photons/sq cm-s in the 20-100 keV band, and A2142 was detected marginally at a flux of (2 + or - 0.8) x 10 to the 0.001 photons/sq cm-s in the 15-40 keV band. Inverse Compton emission was not observed in these clusters. Results are used to derive limits to the intracluster magnetic field of B approximately greater than 5 x 10 to the -7th gauss and B approximately 5 x 10 to the -8th gauss in the Virgo cluster and A1242, respectively. There is some evidence for variability in these sources, which implies that the hard X-ray emission originates in a relatively compact object or region rather than from the cluster as a whole.

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