Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.268..517b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 268, NO. 2/MAY15, P. 517, 1994
Astronomy and Astrophysics
Astronomy
17
Pulsars: Individual: Psr 1509-58 - Pulsars: Individual: Psr 1951+32 - Gamma-Rays: Observations
Scientific paper
The high-energy gamma-ray telescope EGRET observed the positions of two young pulsars, PSR 1951 +32 and 1509- 58, during its all-sky survey. Despite their youth and relative proximity to the Earth, neither pulsar is detected as a point source or in periodicity analysis. Flux limits of a few × 10-7 photon cm-2 s-1 are obtained for emission above 100 MeV, and ˜10-6 photon cm-2 s-1 for 30-100 MeV. For the conventional assumption of beaming into 1 sr, the flux limits suggest that less than 3.2 per cent of the radiation from PSR 1509-58, and less than 1.8 per cent from PSR 1951+32, is in the form of beamed high-energy gamma-rays. The PSR 1509-58 limits lie approximately one order of magnitude below the extrapolated hard X-ray spectrum and suggest that the spectrum steepens in the MeV region.
Bertsch David L.
Brazier K. T. S.
Fichtel Carl E.
Fierro J. M.
Hartman Robert C.
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