A search of the SAS-2 data for pulsed gamma-ray emission from radio pulsars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma Rays, Pulsars, Pulsed Radiation, Radio Astronomy, Sas-2, Energy Dissipation, Photon Density, Radiant Flux Density, Spaceborne Astronomy, Tables (Data)

Scientific paper

Data from the SAS-2 high-energy (above 35 MeV) gamma-ray experiment have been examined for pulsed emission from each of 75 radio pulsars which were viewed by the instrument and which have sufficiently well-defined period and period-derivative information from radio observations to allow for gamma-ray periodicity searches. When gamma-ray arrival times were converted to pulsar phase using the radio reference timing information, two pulsars, PSR 1747-46 and PSR 1818-04, showed positive effects, each with a probability of less than 1 part in 10,000 of being a random fluctuation in the data for that pulsar. These are in addition to PSR 0531+21 and PSR 0833-45, previously reported. The results of this study suggest that gamma-ray astronomy has reached the detection threshold for gamma-ray pulsars and that work in the near future should give important new information on the nature of pulsars.

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