Nonstationary Radio Luminosity of the Remnant of Supernova 1181 (3C 58)

Details Nonstationary Radio Luminosity of the Remnant of Supernova 1181 (3C 58) Nonstationary Radio Luminosity of the Remnant of Supernova 1181 (3C 58)

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30..240i&link_type=abstract

Astronomy Letters, vol. 30, p. 240-246 (2004)

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We measured the flux densities of the radio source 3C 58, which was identified with the remnant of SN 1181, in April-May 2003 relative to the spectrum of the standard source 3C 295 at four frequencies in the range 1550 to 8450 MHz using the RTF-32 radio telescope at the Svetloe Observatory of the Institute of Applied Astronomy (Russian Academy of Sciences). We found significant nonstationary frequency-dependent flux-density variations in 3C 58 and variations in its instantaneous spectrum. We established that these variations occurred between 1986 and 1998. Based on data for the instantaneous spectra, we show that the break in the spectrum of 3C 58 results from prolonged energy losses by relativistic electrons through synchrotron radiation that took place in a nebula with an age of 5400 yr, equal to the age of the pulsar PSR J0205+6449. SN 1181 is shown to have exploded without the birth of a pulsar, which is characteristic of type-I supernovae. The shock acceleration of relativistic electrons after the explosion may be responsible for the observed nonstantionarity of the flux densities. The long-term evolution of the radio spectrum for the nebula 3C 58 and the nonstationary flux-density variations due to the explosion of SN 1181 are reconciled in terms of a model of an evolved binary system.

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