Relationship between the Nonstationary Radio-Luminosity Variations of the Crab Nebula and the Activity of Its Pulsar

Details Relationship between the Nonstationary Radio-Luminosity Variations of the Crab Nebula and the Activity of Its Pulsar Relationship between the Nonstationary Radio-Luminosity Variations of the Crab Nebula and the Activity of Its Pulsar

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31...98s&link_type=abstract

Astronomy Letters, vol. 31, Issue 2, p.98-102

Astronomy and Astrophysics

Astronomy

2

Supernovae And Supernova Remnants - Radio Luminosity - Evolution - Pulsar - Glitches - Magnetospheric Instability - Injection

Scientific paper

Based on the half-century-long history of radio observations of the Crab Nebula, we investigate the evolution of its radio luminosity. We found a secular decrease in the radio luminosity; it has decreased by 9% since the discovery of the radio source in 1948. Apart from the secular decrease in the luminosity of the Crab Nebula, we identified two time intervals, 1981 1987 and 1992 1998, when radio bursts with energy release ˜1041 erg took place. In these years, the spectral indices of the instantaneous spectra decreased significantly due to the increase in the flux densities at short (centimeter and millimeter) wavelengths. These events were preceded by sudden increases in the pulsar’s rotation rates, the largest of which, with an amplitude of ΔΩ/Ω = 3 × 10-8, occurred in 1975 and 1989. We show that the magnetospheric instability mechanism that accompanies strong glitches can provide the energetics of the excess luminosity of the Nebula through the ejection of relativistic electrons with a total energy higher than 6 × 1042 erg from the pulsar’s magnetosphere.

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