Computer Science – Numerical Analysis
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284...28m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. 28-32
Computer Science
Numerical Analysis
10
Active Galactic Nuclei, Astronomical Catalogs, Bl Lacertae Objects, Quasars, Seyfert Galaxies, Stellar Luminosity, X Ray Spectra, Flux Density, Gamma Ray Observatory, Heao, Numerical Analysis, Sky Surveys (Astronomy)
Scientific paper
We have searched the HEAO-4 Low Energy Detectors (LED) all-sky survey database (13-180 keV) for a class of Active Galactic Nuclei (AGN) that is most likely to emit X-rays at energies of approximately equals 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 3 sigma. 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 alpha = 0.7.
Gruber Duane E.
Maisack Michael
Wood Kent S.
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