Infrared study of the Crab pulsar - The 'shoulder' pulse and the 3.45 micron pulse profile

Details Infrared study of the Crab pulsar - The 'shoulder' pulse and the 3.45 micron pulse profile Infrared study of the Crab pulsar - The 'shoulder' pulse and the 3.45 micron pulse profile

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..261m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 261-266.

Astronomy and Astrophysics

Astronomy

25

Crab Nebula, Infrared Astronomy, Pulsars, Astronomical Models, Fourier Analysis, Light Curve, Telescopes

Scientific paper

Infrared measurements of the Crab pulsar with the NASA IRTF 3.0 m telescope show that the spectrum of the main pulse turns downward for wavelengths longer than 3 microns. The 'shoulder' pulse discovered by Pennypacker (1981) is measured in the 0.9-2.4 microns region, but disappears at 3.5 microns. This pulse rise from 0 to 20 percent of the height of the main pulse within 1 to 2 ms after the main pulse peak and decays with a 4 to 5 ms time constant. Excess infrared flux also appears after the interpulse. The main peak itself may be narrower at 3.45 microns than in the optical to 2.2 microns band.

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