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NASA NTRS1978

Gamma-rays of 3 to 25 MeV from the galactic anti-center and pulsar NP 0532

Gamma-rays of 3 to 25 MeV are reported from the galactic anticenter region and the Crab Pulsar, NP 0532. The observations were carried out from Palestine, Texas, on May 13, 1975. Gamma-rays from the galactic anticenter were observed as the Crab Nebula passed overhead within 10 deg of the zenith. Pulsed gamma-rays from NP 0532 were observed at a 4.4-sigma significance level. The total flux from 3-25 MeV is 0.0049 + or - 0.002 photon/sq cm-sec. The pulsed flux from NP 0532 from 3 to 25 MeV is 0.00043 + or - 0.00026 photon/sq cm-sec. The ratio of the total to the pulsed flux from 3 to 25 MeV is 11 + or - 8.

Wilson, R. B.↗
NASA NTRS1975

Search for continuous X-ray emission from NP 0532

A search for continuous X-ray emission from the pulsar NP 0532 has been performed using lunar occultations and high temporal resolution. No increase in the nonpulsed phase of the flux from the Crab Nebula was observed when NP 0532 was exposed. The result is used to establish an upper limit of 4.7 million K (99% confidence) on the surface temperature of the neutron star.

Wolff, R. S.↗