HEAO 1 observations of the Perseus cluster above 10 keV

Details HEAO 1 observations of the Perseus cluster above 10 keV HEAO 1 observations of the Perseus cluster above 10 keV

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243l..13p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Jan. 1, 1981, p. L13-L17.

Astronomy and Astrophysics

Astronomy

47

Galactic Clusters, Heao 1, X Ray Astronomy, X Ray Spectra, Compton Effect, Electron Energy, Energy Spectra, Magnetic Flux

Scientific paper

Results are presented of HEAO 1 observations of the Perseus cluster from 10 to 150 keV in 1977 August and 1978 February and August. The spectrum exhibits a previously unknown hard (greater than 25 keV) component in addition to the previously known thermal bremsstrahlung emission. The data presented show no significant evidence of variability from 10.5 keV to 93.5 keV, and a comparison of our results with earlier results indicates no strong evidence for variability above 25 keV over a time scale of 4 yr. If the hard-component excess is due to NGC 1275, the data imply a 2-6 keV X-ray luminosity of 1 x 10 to the 44th ergs/s for the galaxy, or about 15% of the total cluster emission from 2 to 6 keV and a 25-40 keV luminosity of 8 x 10 to the 43rd ergs/s.

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