Secular decrease the flux of supernova remnant cas a on monitoring results to radiotelescope "URAN-4" IRA NASU
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Дата
2015
Науковий керівник
Укладач
Редактор
Назва журналу
ISSN
E-ISSN
Назва тому
Видавець
Одеський національний університет імені І. І. Мечникова
Анотація
This work is dedicated to the study of
secular decrease of the flux of young supernova remnant
Cas A according to observations by radio- telescope
"URAN-4» of Odessa Observatory IRA NASU from
1987 to 2001 years on frequency of 25 MHz. On the
investigation base there is a relationship analysis of flux
CasA to the "stable" source – radio-galaxy Cyg A
(CasA/Cyg A) which is located on a small angular
distance. Results of the observations held on RT «URAN-
4» show that there is no noticeable decrease of fluxes in
the period 1987-1993, with the relationship ratio
(CasA/Cyg A) = 1.5. While considering data from 1987 to
2001 manifested a slight decrease trend in flux equal to
8.4% for the all period. At the same time, according to
various investigations the average value flux of Cas A in
the interval of frequencies 38-2924 MHz is 0.8% per year.
At the meantime in this frequency the range ratio
(CasA/Cyg A) has become less than one. Thus, there is a
noticable contradiction of secular decrease of the flux Cas
A on this radio frequencies in comparison with the
predictions of the theory in 1.7% per year.
Опис
Ключові слова
supernova remnant, radioemission
Бібліографічний опис
Odessa Astronomical publications = Одесские астрономические публикации = Одеські астрономічні публікації