Which unidentified EGRET sources are gamma-ray pulsars?

Astronomy and Astrophysics – Astrophysics

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Gamma Rays: Theory, Stars: Pulsars: General, Stars: Neutron

Scientific paper

We consider high energy gamma -ray radiation from the radio pulsars associated with some unidentified EGRET gamma -ray sources. Calculated efficiencies for the conversion of spin-down power to gamma -rays and the energy spectra of the high energy gamma -rays from these possible gamma -ray pulsars in outer gap models are compared with observed results. Of these possible gamma -ray pulsars, our results indicate that (i) PSR B1900+05 is not a possible gamma -ray pulsar; (ii) although the newly discovered young radio pulsar PSR J1105-6107 is a possible gamma -ray pulsar, it may not account for the observed high energy gamma -ray emission from 2EG J1103-6106; (iii) the high energy gamma -rays from 2EG J1801-2312 and 2EG J1857+0118 may not be produced completely by radio pulsars PSR B1758-23 and PSR B1853+01 respectively; (iv) the counterparts (radio pulsars PSR B1046-58 and PSR B1823-13) of 2EG J1049-5247 and 2EG J1825-1307 are possible gamma -ray pulsars; and (v) 2EG J0008-7307 associated with a young supernova remnant CTA 1 may contain a gamma -ray pulsar with period 0.16>= P>= 0.12 s.

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