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PSR 1509-58

Abstract:

RB Wilson, MH Finger, GJ Fishman, CA Meegan, and WS Paciesas report for the Compton Gamma Ray Observatory BATSE team:" The 150-ms x-ray/radio pulsar PSR 1509-58 (the Circinus Pulsar) in the supernova remnant MSH 15-52 has been detected in the low-energy gamma-ray region. It is only the second pulsar to be seen at these energies (the other being the Crab Pulsar). Pulsed emission is clearly seen in the energy range from 20 keV to> 2 MeV. In this region, the spectrum is harder than that of the Crab Pulsar. The pulse profile is similar in shape and duty cycle to that seen in the x-ray region (Trussoni et al. 1990, A. Ap. 234, 403; Kawai et al. 1991, Ap. J. 383, L65), although the single pulse becomes narrower at higher energies. Observations were made with the large-area BATSE detectors on the Compton Observatory. The results below are from an observation during 1991 December, with a'live-time'of …