Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..559h&link_type=abstract
The Astrophysical Journal Supplement Series, vol. 92, no. 2, p. 559-566
Astronomy and Astrophysics
Astronomy
17
Gamma Ray Astronomy, Gamma Ray Spectra, Pulsars, Spectral Emission, Stellar Spectra, Gamma Ray Observatory, Light Curve, Spectral Energy Distribution, Variability
Scientific paper
Since the launch of the Compton Gamma-Ray Observatory (CGRO) the number of detected gamma-ray pulsars increased from two to six. COMPTEL, on-board CGRO and sensitive to gamma-rays with energies between approximately 0.7 and 30 MeV, detected three of these unambiguously. The classical Crab and Vela pulsars have been observed on several occasions and detailed pulse patterns and spectral parameters have been derived. The new CGRO gamma-ray pulsar PSR B1509-58 has been detected by COMPTEL at a significance level above 4 sigma, consistently in a timing and spatial analysis. A likely detection of Geminga has been obtained at an approximately 3 sigma level. This indication is found in a phase interval in which COS B data showed the presence of a new variable component, Interpeak 2, exhibiting a very soft spectrum above 50 MeV. The diversities in light-curve sphapes and spectral distributions, the apparent time variabilities, and the significant differences in the fractions of the spin-down power radiated at gamma-ray energies in this small sample of gamma-ray pulsars pose important constraints to pulsar modeling.
Bennett Kevin
Buccheri Rosolino
Busetta M.
Carraminana Alberto
Connors Alanna
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