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Hβ and continuum variability in the Seyfert galaxy Akn 120 from Crimean observations during 1974-1990статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Doroshenko V.T., Sergeev S.G., Pronik V.I., Chuvaev K.K.
- Журнал: Astronomy Letters
- Том: 25
- Номер: 9
- Год издания: 1999
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 569
- Последняя страница: 581
- Аннотация: Crimean spectroscopic observations of the nucleus of the Seyfert galaxy Akn 120 during 1974-1990 are presented. Observations of the H_beta region are used to show that the flux variations in H_beta follow the flux variations in the continuum near lambda 5100 A with a lag of 34-54 days. The cross-correlation between the H_beta wings and the continuum provides evidence for accretion of the matter that is responsible for the line emission. The reproducibility of the H_beta profiles on time scales of about a year or longer at significant continuum variations suggests that the ionization conditions in the broad-line region are reproducible. The emission of the FeII lines, which form the so-called "red shelf," has been separated from the blend of H_beta with FeII. The flux variations in the lines of ionized iron in this shelf and in the FeII (lambda 4570 A) blend correlate with the H_beta-flux variations, suggesting that the H_beta- and FeII-line regions are close in space. An attempt is made to represent the broad H_beta-line profile by Gaussians. If the line profile is fitted by three Gaussian components, then the flux in the short-wavelength component, which is shifted from the systematic velocity by -750 km/s, correlates best with the continuum.
- Добавил в систему: Дорошенко Валентина Трофимовна