Evidence for low-energy gamma-ray emission close to CG135+1

Details Evidence for low-energy gamma-ray emission close to CG135+1 Evidence for low-energy gamma-ray emission close to CG135+1

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..486d&link_type=abstract

Nature, vol. 282, Nov. 29, 1979, p. 486, 487.

Astronomy and Astrophysics

Astronomy

3

Emission Spectra, Gamma Ray Astronomy, Radio Sources (Astronomy), Sky Radiation, Energy Spectra, Particle Energy, Photons, Power Spectra, Quasars, Telescopes, X Ray Astronomy

Scientific paper

Observations of low-energy gamma-ray emission in the vicinity of the COS-B source CG 135+1 are reported. The balloon-borne MISO telescope consisting of two scintillators forming a Compton coincidence detection system was used to scan the region of the sky between 2 h, 16 min. and 3 h, 12 min r. a. centered at 62 deg dec. at zenith angles from 30 to 34 deg and energies between 0.15 and 20 MeV. A total gamma-ray excess of 4.1 + or - 0.8 cps is obtained for the sum of all three channels, corresponding to five standard deviations. The origin of this low-energy emission is shown to be compatible with the measured position of CG 135 + 1, and the measured gamma-ray flux is considered to indicate a spectral steepening close to 1 MeV of the object, assuming its identification with the X-ray object.

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