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Title:
Einstein observations of the Crab nebula pulsar
Authors:
Harnden, F. R., Jr.; Seward, F. D.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 279-285. (ApJ Homepage)
Publication Date:
08/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Crab Nebula, Pulsars, X Ray Sources, Heao 2, Light Curve, Spatial Distribution, Temporal Distribution
DOI:
10.1086/162304
Bibliographic Code:
1984ApJ...283..279H

Abstract

Einstein Observatory (HEAO 2) high-resolution (approximately 4 sec) images of the Crab nebula which clearly resolve the pulsar from the diffuse X-ray emission are presented. The pulsar contributes 3.9 + or - 0.2 percent of the observed 0.1-4.5 keV flux and shows no evidence (other than the 33 ms pulsations) for variations on time scales up to approximately 2.3 days. The pulsar flux decreases to zero over about one-eighth of the cycle, with the upper limit to point source emission during this interval implying a blackbody surface temperature of less than 2.5 x 10 to the 6th K for the neutron star (10 km assumed radius). The spatial distribution of nebular emission near the pulsar closely resembles that of the optical continuum.

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