SIMBAD references

1994A&A...284...28M - Astronomy and Astrophysics, volume 284, 28-32 (1994/4-1)

AGN emission above 20 keV: the hard X-ray detection problem.


Abstract (from CDS):

We have searched the HEAO-4 LED all-sky survey database (13-180 keV) for a class of AGN that is most likely to emit X-rays at energies of ∼ 50 keV and above, as a basis for further studies with the Compton Gamma Ray Observatory (CGRO). We have overlayed the survey signals of several samples of AGN-quasars, BL Lacs and Seyfert galaxies - with individual source flux below a significance of 3σ. The objects were selected by their prominence and properties at other wavelengths, and in Einstein observations and the HEAO-A1 survey. We find no significant signal at hard X-rays from any of the chosen classes of radio- loud QSOs and BL Lacs. We find a signal from Seyfert 1 galaxies up to 80 keV compatible with the canonical energy index α=0.7.

Abstract Copyright:

Journal keyword(s): galaxies: active - X-rays: galaxies - γ-ray: observations

Simbad objects: 57

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