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无线电物理和天文学期刊

ISSN 打印: 2152-274X
ISSN 在线: 2152-2758

Archives: Volume 1, 2010 to Volume 3, 2012

无线电物理和天文学期刊

DOI: 10.1615/RadioPhysicsRadioAstronomy.v2.i1.10
pages 3-14

EVOLUTION OF RADIO EMISSION OF CASSIOPEIA A SUPERNOVA REMNANT BY FIFTY-YEAR OBSERVATIONS NEAR FREQUENCIES 12.6, 14.7, 16.7, 20, AND 25 MHZ

V. P. Bovkoon
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
I. N. Boobnov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine
I. N. Zhouck
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
Alexandr A. Konovalenko
Institute of Radio Astronomy of the National Academy of Sciences of Ukraine

ABSTRACT

The results of measurements in the ratios of flux densities of Cas A supernova remnant and Cyg A radio galaxy during 1959.5−2009.4 at frequencies 12.6, 14.7, 16.7, 20, and 25 MHz are shown. The radio telescopes used in these measurements are briefly mentioned. Strong variations in Cas A flux densities at decameter wavelengths are shown to be observed. The average drop rate of Cas A flux density for a 50-yr period has been determined. For the decameters, it makes (0.81 ± 0.04) % per year, being frequency independent within the measuring errors.