EGRET Upper Limits on the High-Energy Gamma-Ray Emission of X-Ray Novae

Details EGRET Upper Limits on the High-Energy Gamma-Ray Emission of X-Ray Novae EGRET Upper Limits on the High-Energy Gamma-Ray Emission of X-Ray Novae

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462l..67l&link_type=abstract

Astrophysical Journal Letters v.462, p.L67

Astronomy and Astrophysics

Astronomy

5

Ism: Jets And Outflows, Gamma Rays: Observations, X-Rays: Stars

Scientific paper

We report EGRET upper limits on the high-energy gamma -ray emission of three X-ray novae: 4U 1543-47, GRO J0422+32, and GRO J1655-40. The implications of these upper limits are discussed. GRO J1655-40 is of particular interest because it has been identified as a superluminal radio source. Unfortunately, the radio flux was low during the EGRET observation. If the jet power inferred from the peak of the radio emission existed at the time of the EGRET observation, our EGRET upper limit implies that the fraction of jet power emitted as EGRET gamma -rays is less than 12%. We speculate upon the origin of the radio emission, and discuss the implications for the production efficiency of GeV gamma -rays.

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