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- W2091268539 abstract "view Abstract Citations (5) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Gamma-Ray Bright Quasars and BL Lacertae Objects: EGRET Data Schachter, Jonathan ; Elvis, Martin Abstract The CGRO Instruments, in particular, EGRET, have recently discovered new, gamma-ray bright active galactic nuclei (AGNs) (fluxes ~ 0.5-3 times as bright as 3C 273). Yet current sample sizes are modest (for example, EGRET as of 1993 January has detected 17 quasars and five BL Lac objects), and the sources probe only a small range in flux. Only by using a large, unbiased sample of AGNs can we answer key questions about source evolution, contributions to the gamma-ray background, and the different gamma-ray properties of quasars and BL Lac objects. Therefore, we need gamma-ray data on a much larger number of AGNs. We are currently pursuing two approaches toward remedying this situation: first, new (phase 2) OSSE, COMPTEL and EGRET observations of X-ray selected AGNs predicted to be gamma-ray bright on simple assumptions: even an upper limit can set constraints on continuum models (e.g., pair production, synchrotron self-Compton); second, searches for radio-selected AGNs in wide-field EGRET data obtained during the pointings. For these AGN, we expect a large number of faint sources (i.e., mainly low signal-to-noise ratio detections and upper limits), a continuous progression down to the limiting EGRET sensitivity. Although special techniques must be employed to deal carefully with low- significance sources, the end product will be a much larger sample than currently available on which to base deductions about the gamma-ray properties of AGNs. Here we report the first results of this program. We find an upper limit for 3C 382 and demonstrate, using the 3C 382 field, how serendipitous blazars can systematically be searched for in existing EGRET public (Phase 1) data. Preliminary results indicate that synchrotron self-Compton processes dominate. Publication: The Astrophysical Journal Supplement Series Pub Date: June 1994 DOI: 10.1086/192028 Bibcode: 1994ApJS...92..623S Keywords: Active Galactic Nuclei; Bl Lacertae Objects; Gamma Ray Astronomy; Gamma Ray Spectra; Quasars; Spectral Emission; Gamma Ray Observatory; Surveys; Astronomy; GALAXIES: BL LACERTAE OBJECTS: GENERAL; GAMMA RAYS: OBSERVATIONS; GALAXIES: QUASARS: GENERAL; X-RAYS: GALAXIES full text sources ADS | data products SIMBAD (6) NED (1) HEASARC (1)" @default.
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- W2091268539 date "1994-06-01" @default.
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- W2091268539 title "Gamma-ray bright quasars and BL Lacertae objects: EGRET data" @default.
- W2091268539 doi "https://doi.org/10.1086/192028" @default.
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