The low-frequency compact source in the Crab Nebula

Details The low-frequency compact source in the Crab Nebula The low-frequency compact source in the Crab Nebula

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64..734b&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, July-Aug. 1987, p. 734-741. In Russian.

Astronomy and Astrophysics

Astronomy

Crab Nebula, Decametric Waves, Low Frequencies, Pulsars, Radiant Flux Density, Radio Spectra, Emission Spectra, Spectrum Analysis, Stellar Spectra, Stellar Spectrophotometry

Scientific paper

The parameters of the low-frequency compact source in the Crab nebula are given. In the decameter-wavelength range its coordinates, α(1950.0) = 5h31m31s, 62±0s.22 and δ(1950.0) = 21°58arcmin52arcsec, 8±3arcsec.9, coincide within the error limits with those of the pulsar PSR 0531+21. The apparent angular size of the compact source varies with the frequency ν as θ0 ∝ ν-1.95±0.25 from 3arcsec.3 at 12.6 MHz to 0arcsec.18 at 75 MHz. The flux density of the integral radio emission of the compact source and the pulsar Sν(Jy) in function of the frequency ν(Hz) is approximated by the expression Sν = 44(1+2y2)-1y-5/3 where y = ν/(1.6×108). The spectrum of the summary emission of the compact source and the pulsar is explained by coherent curvature radiation of charged clots with effective thickness 60 cm.

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