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Analysis of the Broad Emission Line Profiles in the Active Galactic Nucleus 3C 390.3статья
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
- Авторы: Nazarova L.S., Bochkarev N.G., Gaskell C.M.
- Журнал: Astronomical and Astrophysical Transactions
- Том: 23
- Номер: 5
- Год издания: 2004
- Издательство: Cambridge Scientific Publishers
- Местоположение издательства: Cambridge
- Первая страница: 343
- Последняя страница: 352
- DOI: 10.1080/10556970410001729544
- Аннотация: We present a study of UV and optical spectra of the active galaxy 3C 390.3 taken as part of the International AGN Watch during the period January 1995 – January 1996. We have measured the C IV/Lyα and Lyα/Hβ ratios at the different velocities in the line profiles. We find that the Lyα/Hβ varies across the line profiles. The ratio is high in the low-velocity center of the lines at all times, but decreases in the high-velocity wings. The ratio of the line intensities of C IV/Lyα however is low at the line center but becomes higher in the wings. This velocity dependence of line ratios is different from what has been reported for most other AGNs. Theoretical modelling of the C IV/Lyα and Lyα/Hβ ratios, using the photoionization code CLOUDY, suggests that the density is higher in the higher velocity gas and that the observed line ratios can be accounted for by two systems of clouds. One corresponds to the high ionization line (HIL) zone with an electron density, N$_e$ \ap 10$^8-10$ cm$^-3$. It is presumably located above the accretion disk. The other system corresponds to the low-ionization line (LIL) zone which, because of the line profiles, is probably part of the accretion disk, and which has a higher electron density, N$_e$ \ap 10$^11-12$ cm$^-3$. We discuss the possible geometry of the BLR in 3C 390.3.
- Добавил в систему: Бочкарев Николай Геннадиевич