High-energy nonthermal radiation from putative Geminga-like gamma-ray pulsars

Astronomy and Astrophysics – Astrophysics

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Pulsars: General, Gamma Rays: Theory, Radiation Mechanisms: Non-Thermal

Scientific paper

Aims: The gamma-ray spectra of some unidentified Galactic sources show that the corresponding counterparts are likely gamma-ray pulsars. We investigate the possibility of some Geminga-like gamma-ray pulsars as the counterparts of unidentified sources. Methods: There are five Geminga-like gamma-ray pulsar candidates associated with 3EG J0010+7309, 3EG J1835+5918, 3EG J2020+4017, 3EG J0616-3310, and 3EG J1249-8330. Combining the observed nonthermal X-ray emission detected by Chandra or XMM-Newton and the gamma-ray emission by EGRET, we study the high-energy radiation from these putative pulsars based on the revised vacuum outer gap model. Results: By comparing the estimated spectra with the observations, we estimated the spin parameters and the inclination angles for these five putative pulsars. The observed spectra of the unidentified gamma-ray sources can be explained by this outer gap model.

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