Observation of Pulsed Hard X-Radiation from NP 0532 from 1967 Data

Abstract

An analysis of data obtained during a 1967 balloon-borne measurement of the Crab Nebula revea's the presence of pulsed hard X-radiation at the period of NP 0532. The early date of observation permits an accurate determination of the slow-down rate: 36.51 ± 0.02 nsec day1. The pulsed luminosity is 7 ± 2 per cent of the total Crab radiation above 35 keY if the spectral shape of NP 0532 is like that of the nebula at these energies