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## Radio Observations of Supernova Remnants Using the RT-32 Radio Telescope at the “Svetloe” Observatory of the IAA RAS

Transactions of IAA RAS, issue 48, 56–63 (2019)

Keywords: radio emission spectra of supernova remnants, radio telescope, spectrum, standard sourse, flux density, variability.

### Abstract

The flux densities of supernova remnants (SR) spectra G21.5–0.9 were measured at 4840 and 8450 MHz frequencies with the RT-32 radio telescope at the “Svetloe” Observatory in 2013–2018, and repeated measurements revealed the source variability. The measurement technique and accuracy are discussed. Additional data on SR radio emission fluxes for earlier epochs and at various frequencies were obtained on the basis of published data containing comparisons of the intensities of the studied and standard sources. The literature data are presented as a consistent system, including the measurements with RT-32 of the “Svetloe” Observatory of the IAA RAS, based on the “Artificial Moon” flux scale standards. This procedure essentially improves the data system, the spectrum of the source and its variability. The parameters of the spectrum are determined. It is shown that the kink in the spectrum of G21.5–0.9 is not associated with the synchrotron emission of relativistic electrons. The possible causes of the changes detected in the spectrum of G21.5–0.9 are discussed.

### Citation

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V. P. Ivanov, A. V. Ipatov, I. A. Rahimov, S. A. Grenkov, T. S. Andreeva. Radio Observations of Supernova Remnants Using the RT-32 Radio Telescope at the “Svetloe” Observatory of the IAA RAS // Transactions of IAA RAS. — 2019. — Issue 48. — P. 56–63. @article{ivanov2019, abstract = {The flux densities of supernova remnants (SR) spectra G21.5–0.9 were measured at 4840 and 8450 MHz frequencies with the RT-32 radio telescope at the “Svetloe” Observatory in 2013–2018, and repeated measurements revealed the source variability. The measurement technique and accuracy are discussed. Additional data on SR radio emission fluxes for earlier epochs and at various frequencies were obtained on the basis of published data containing comparisons of the intensities of the studied and standard sources. The literature data are presented as a consistent system, including the measurements with RT-32 of the “Svetloe” Observatory of the IAA RAS, based on the “Artificial Moon” flux scale standards. This procedure essentially improves the data system, the spectrum of the source and its variability. The parameters of the spectrum are determined. It is shown that the kink in the spectrum of G21.5–0.9 is not associated with the synchrotron emission of relativistic electrons. The possible causes of the changes detected in the spectrum of G21.5–0.9 are discussed.}, author = {V.~P. Ivanov and A.~V. Ipatov and I.~A. Rahimov and S.~A. Grenkov and T.~S. Andreeva}, doi = {10.32876/ApplAstron.48.56-63}, issue = {48}, journal = {Transactions of IAA RAS}, keyword = {radio emission spectra of supernova remnants, radio telescope, spectrum, standard sourse, flux density, variability}, pages = {56--63}, title = {Radio Observations of Supernova Remnants Using the RT-32 Radio Telescope at the “Svetloe” Observatory of the IAA RAS}, url = {http://iaaras.ru/en/library/paper/1953/}, year = {2019} } TY - JOUR TI - Radio Observations of Supernova Remnants Using the RT-32 Radio Telescope at the “Svetloe” Observatory of the IAA RAS AU - Ivanov, V. P. AU - Ipatov, A. V. AU - Rahimov, I. A. AU - Grenkov, S. A. AU - Andreeva, T. S. PY - 2019 T2 - Transactions of IAA RAS IS - 48 SP - 56 AB - The flux densities of supernova remnants (SR) spectra G21.5–0.9 were measured at 4840 and 8450 MHz frequencies with the RT-32 radio telescope at the “Svetloe” Observatory in 2013–2018, and repeated measurements revealed the source variability. The measurement technique and accuracy are discussed. Additional data on SR radio emission fluxes for earlier epochs and at various frequencies were obtained on the basis of published data containing comparisons of the intensities of the studied and standard sources. The literature data are presented as a consistent system, including the measurements with RT-32 of the “Svetloe” Observatory of the IAA RAS, based on the “Artificial Moon” flux scale standards. This procedure essentially improves the data system, the spectrum of the source and its variability. The parameters of the spectrum are determined. It is shown that the kink in the spectrum of G21.5–0.9 is not associated with the synchrotron emission of relativistic electrons. The possible causes of the changes detected in the spectrum of G21.5–0.9 are discussed. DO - 10.32876/ApplAstron.48.56-63 UR - http://iaaras.ru/en/library/paper/1953/ ER -