The Non-Detection of Gamma-Ray Emission from X-ray Selected BL Lacs and Radio-Quiet Quasars

Astronomy and Astrophysics – Astronomy

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The EGRET/CGRO telescope has detected ~ 40 radio-loud quasars and radio-selected BL Lacertae objects. No detections of radio-quiet AGN have been reported. In order to fully examine this question, we have searched the EGRET phase 1 full-sky-survey for E>100 MeV gamma -ray emission from the class of X-ray selected BL Lac objects and from the 200 brightest radio-quiet quasars. The preliminary result is that neither class is detected. This implies that apparent gamma -ray emission is intimately linked to apparent radio emission, both probably occurring in a relativistic jet. If X-ray selected BL Lacs are radio quiet because the radio beam is narrower than the X-ray beam, any strong gamma -ray emission must also be narrowly beamed.

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