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Astron. Astrophys. 335, 234-242 (1998)

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Which unidentified EGRET sources are gamma-ray pulsars?

L. Zhang and K.S. Cheng

Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong, P.R. China

Received 17 November 1997 / Accepted 20 March 1998


We consider high energy [FORMULA] -ray radiation from the radio pulsars associated with some unidentified EGRET [FORMULA] -ray sources. Calculated efficiencies for the conversion of spin-down power to [FORMULA] -rays and the energy spectra of the high energy [FORMULA] -rays from these possible [FORMULA] -ray pulsars in outer gap models are compared with observed results. Of these possible [FORMULA] -ray pulsars, our results indicate that (i) PSR B1900+05 is not a possible [FORMULA] -ray pulsar; (ii) although the newly discovered young radio pulsar PSR J1105-6107 is a possible [FORMULA] -ray pulsar, it may not account for the observed high energy [FORMULA] -ray emission from 2EG J1103-6106; (iii) the high energy [FORMULA] -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 [FORMULA] -ray pulsars; and (v) 2EG J0008-7307 associated with a young supernova remnant CTA 1 may contain a [FORMULA] -ray pulsar with period [FORMULA] s.

Key words: gamma rays: theory – stars: pulsars: general – stars: neutron

Send offprint requests to: K.S. Cheng

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© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998