The study of extragalactic sources 3C 446 AND 3C 345 with using the singular spectrum and wavelet analysis
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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
We investigated the data of monitoring of
flux density of extragalactic sources 3С446 and 3C345,
which was held on 26-meter radio telescope of University
of Michigan at frequencies 14.5, 8 and 4.8 GHz. The data
of observations were investigated using singular spectrum
analysis and wavelet-analysis. According to the results of
wavelet analysis for each year of observations, graphics of
“spectra periods” were built to determine the contribution
of individual periods in the activity of the radio source. The
results obtained with two different methods showed a good
correlation between them. For a long time component of the
flux the periods of ~ 5 – 9 years were found. For short term
components the periods of ~ 1 – 4 years are presented. The
results obtained using two different methods were
compared with VLBI radio maps, which were obtained by
the program MOJAVE. The changes of periods over time
are associated with certain physical processes in the system
"core – accretion disk – jet" and with appearing of new
bright components (knots) in the jet.
Опис
Ключові слова
AGN, jet
Бібліографічний опис
Odessa Astronomical publications = Одесские астрономические публикации = Одеські астрономічні публікації