Scattering of X-rays from Pulsar NP 0532 by Interstellar Grains

Details Scattering of X-rays from Pulsar NP 0532 by Interstellar Grains Scattering of X-rays from Pulsar NP 0532 by Interstellar Grains

Feb 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970natur.225..834n&link_type=abstract

Nature, Volume 225, Issue 5235, pp. 834-836 (1970).

Computer Science

15

Scientific paper

SLYSH1 recently considered the scattering of soft X-rays from the Crab Nebula, and suggested that although all the observed X-rays from the Crab Nebula could have originated as pulsed X-rays from the pulsar NP 0532 at the centre, only ~10 per cent unscattered by interstellar grains are recorded as pulsed X-rays in the 1-10 keV region2-4. The remaining 90 per cent are scattered, appearing as a diffuse source about 2' wide5,6 in which the pulses are smeared out. In this report we show that the optical depth for scattering by interstellar grains is-small in the 1-10 keV region, and that the pulsed component is reduced by ~20 per cent at the most. Consequently the observed spectrum of the pulsed component in the 1-100 keV region2-4,7,8 should closely correspond to the spectrum of the pulsar at the source, which would not have been the case from the analysis of Slysh. The optical depth for scattering is quite insensitive to the exact model of interstellar grains.

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