1999ApJ...519..637M -
Astrophys. J., 519, 637-641 (1999/July-2)
BATSE observations of the Piccinotti sample of active galactic nuclei.
MALIZIA A., BASSANI L., ZHANG S.N., DEAN A.J., PACIESAS W.S. and PALUMBO G.G.C.
Abstract (from CDS):
BATSE Earth-occultation data have been used to search for emission in the 20-100 keV band from all sources in the Piccinotti sample, which represents the only complete 2-10 keV survey to date of the extragalactic sky down to a limiting flux of 3.1x10–11 ergs.cm–2.s–1. Nearly 4 yr of observations have been analyzed to reach a 5 σ sensitivity level of about 7.8x10–11 ergs.cm–2.s–1 in the band considered. Of the 36 sources in the sample, 14 have been detected above the 5 σ confidence level, while marginal detection (3≤σ≤5) can be claimed for 13 sources; for nine objects 2 σ upper limits are reported. A comparison of BATSE results with data at higher energies is used to estimate the robustness of our data analysis: while the detection level of each source is reliable, the flux measurement maybe overestimated in some sources by as much as 35%, probably because of incomplete data cleaning. Comparison of BATSE fluxes with X-ray fluxes obtained in the 2-10 keV range and averaged over years indicates that a canonical power law of photon index 1.7 gives a good description of the broadband spectra of bright active galactic nuclei (AGNs) and that spectral breaks preferentially occur above 100 keV.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Active - Gamma Rays: Observations - X-Rays: Galaxies
Simbad objects:
34
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