Nonstationary radio luminosity of the remnant of Supernova 1181 (3C 58) |
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| Authors: | V P Ivanov I A Rakhimov S G Smolentsev K S Stankevich A M Finkelstein |
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| Institution: | (1) Radiophysical Research Institute, ul. Bol'shaya Pecherskaya 25, GSP-51, Nizhni Novgorod, 603950, Russia;(2) Institute of Applied Astronomy, Russian Academy of Sciences, nab. Kutuzova 10, St. Petersburg, 191187, Russia |
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| Abstract: | 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 fourf requencies 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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| Keywords: | supernovae supernova remnants pulsars age nonstationary radio emission instantaneous spectra |
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