Low energy gamma-ray observations with the MISO telescope

Details Low energy gamma-ray observations with the MISO telescope Low energy gamma-ray observations with the MISO telescope

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..603b&link_type=abstract

(Royal Society, Discussion on Gamma-Ray Astronomy, London, England, Nov. 27, 28, 1980.) Royal Society (London), Philosophical Tr

Astronomy and Astrophysics

Astronomy

1

Gamma Ray Telescopes, Seyfert Galaxies, X Ray Telescopes, Black Holes (Astronomy), Energy Spectra

Scientific paper

A passively shielded hard X-ray detector (10-280 keV) having an effective area of 600 sq cm was used to study the region of the sky containing NGC 4151 on September 30, 1979. A series of five drift scans were performed to survey the region contained within the coordinate points 11h32 and 12h33 in right ascension. Models based upon Penrose-Compton scattering in the ergosphere on a rapidly rotating black hole have been proposed to explain the gamma-ray emission from NGC 4151. An estimate of the mass of the black hole may be obtained from the gamma-ray luminosity in the range from 0.5 to 5.0 MeV. A value of at least 4 million solar masses is obtained for the mass of the condensed object. This value together with the size considerations suggests the presence of a compact object in the nucleus of NGC 4151 if the X- and gamma-ray fluxes both originate from this region.

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