The Crab pulsar in the 0.75-30 MeV range as seen by CGRO COMPTEL

摘要: We present the time-averaged characteristics of Crab pulsar in 0.75{30 MeV energy window using data from imaging Compton Telescope COMPTEL aboard Gamma-Ray Observatory (CGRO) collected over its 9 year mission. Exploiting exceptionally long exposure on allowed us to derive signicantly improved spectra for nebula and emissions, rst time accurately determine at low-energy -rays pulse prole as a function energy. These timing data, showing well-known main second phase separation 0:4 with strong bridge emission, are studied together obtained soft/hard X-ray energies ROSAT HRI, BeppoSAX LECS, MECS PDS, soft CGRO BATSE high-energy EGRET order obtain coherent picture 0.1 keV up 10 GeV. The morphology is continuously changing energy: intensities both emission increase relative that increasing 1 MeV. Over range above an abrupt change happens: becomes again dominant loses signicance such 30 similar one observed optical wavelengths. A pulse-phase-resolved spectral analysis performed 7 narrow slices consistently applied keV{10 GeV interval shows pulsed can empirically be described 3 distinct components: i) power-law component (1 keV{5 GeV; photon index 2:022 0:014), intervals two pulses; ii) curved required describe (<100 keV) excess same pulse- intervals; iii) broad reflecting This extends full approximately triangular shape, peaking under pulse. Recent model calculations three-dimensional magnetosphere outer magnetospheric gap acceleration by Cheng et al. (2000) appear most successful explaining complex pulsar.