Frequency dependence of the evolution of the radio emission of the supernova remnant Cas A

被引：28

作者：

Vinyaikin, E. N. ^{[1
]}

机构：

[1] Radio Phys Res Inst, Nizhnii Novgorod, Russia

来源：

ASTRONOMY REPORTS | 2014年 / 58卷 / 09期

关键词：

CASSIOPEIA-A SUPERNOVA; COSMIC-RAY ACCELERATION; LONG-TERM OBSERVATIONS; FLUX-DENSITY SCALE; SECULAR DECREASE; 38; MHZ; RECOMBINATION LINES; INFRARED ECHOES; CRAB-NEBULA; SPECTRUM;

D O I：

10.1134/S1063772914090078

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Many-year measurements of the radio flux of the young supernova remnant Cassiopeia A relative to the radio galaxy Cygnus A were continued at 290 and 151.5 MHz. The new data are used together with previously published observations carried out at decameter, meter, centimeter, and millimeter wavelengths to derive the frequency dependence of the secular variation of the radio flux density of Cas A The observed slowing of the secular variations with decreasing frequency at decameter wavelengths can be explained by a decrease in the optical depth of a remnant HII zone around Cas A with time due to recombination of hydrogen atoms. The new derived frequency dependence for the rate of the secular decrease, absolute and relative measurements of the radio flux density of Cas A carried out over the last 25 years, and the absolute spectrum of Cyg A are used to construct the spectrum of Cas A in the range 5-250 000 MHz predicted for epoch 2015.5.

引用

页码：626 / 639

页数：14

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