Energy spectra of very high energy gamma-rays from the Crab and VELA pulsars

Details Energy spectra of very high energy gamma-rays from the Crab and VELA pulsars Energy spectra of very high energy gamma-rays from the Crab and VELA pulsars

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101..157g&link_type=abstract

IN: Positron-electron pairs in astrophysics; Proceedings of the Workshop, Greenbelt, MD, January 6-8, 1983 (A85-31276 13-90). Ne

Astronomy and Astrophysics

Astrophysics

1

Cerenkov Counters, Crab Nebula, Energy Spectra, Gamma Rays, Pulsars, Radiant Flux Density, Supernova Remnants, Telescopes

Scientific paper

Pulsed emission of very high-energy (energies greater than 10 to the 12th eV) gamma-rays from the Crab and Vela pulsars was observed using an 18-reflector Ooty Cerenkov telescope in the distributed mode, determining the arrival direction of individual showers to about 0.3 deg. A note is made of the sporadic character of the Crab pulsar emission with significant variability of the pulsed flux over periods of tens of minutes; pulsed flux of (2.2 + or - 0.5) x 10 to the -11th ph/sq cm s was measured at energies of greater than 9 x 10 to the 11th eV, which agrees well with the extrapolated values both in amplitude and spectral slope. For the Vela pulsar the time-averaged pulsed flux is (1.0 + or - 0.4) x 10 to the -11th ph/sq cm s at energies greater than 2.3 x 10 to the 12th, which is about two orders of magnitude smaller than the extrapolated value. It is concluded that a large difference exists between the emissions from these two pulsars.

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