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

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 <sl>Chandra</sl> or <sl>XMM-Newton</sl> and the gamma-ray emission by <sl>EGRET</sl>, 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.