HEAO 1 observations of high-energy X-rays from 3C273

Details HEAO 1 observations of high-energy X-rays from 3C273 HEAO 1 observations of high-energy X-rays from 3C273

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.278..234p&link_type=abstract

Nature, vol. 278, Mar. 15, 1979, p. 234, 235.

Astronomy and Astrophysics

Astronomy

52

Gamma Ray Astronomy, Heao 1, Quasars, X Ray Sources, Emission Spectra, Photons

Scientific paper

The first detection of high energy (13 to 120 keV) X rays from the quasar 3C273, made by the HEAO 1 satellite, is reported. Observations were made with the 13 to 180 keV slat collimated detectors of the high energy X-ray and low energy gamma-ray (A4) experiment during December 1977-January 1978 and June-July 1978. Results are consistent with the previously observed X-ray flux variability on a scale of months. Photon count rates are presented for each of five energy bands and count rate and photon spectra for the June through July 1978 observations are derived. A comparison of the data obtained with that at lower X-ray energies and higher gamma-ray energies indicates that there is an overall spectral steepening from low to high energies and a possible break near 20 keV, which may be due to the gamma rays originating from a different region than that of the X rays.

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