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Double peaked structure on the broad Halpha and Hbeta emission line profiles in NGC 5548статья
- Авторы: Shapovalova A.I., Doroshenko V.T., Bochkarev N.G., Burenkov A.N., Carrasco L., Chavushyan V.H., Collin S., Valdés J.R., Borisov N., Dumont A.M., Vlasuyk V.V.
- Журнал: Memorie della Società Astronomica Italiana
- Том: 76
- Год издания: 2005
- Первая страница: 49
- Аннотация: We studied the profile variability of the broad Halpha and Hbeta emission lines in NGC 5548 from 1996 until 2003, using the spectral data obtained at the 6 m and 1 m telescopes of SAO (Russia) and at 2.1 m telescope of the GHO at Cananea (México) during 140 nights. The spectral resolution was 4.5 - 15 Å, and the S/N ratio was \gt50 in the continuum near Halpha and Hbeta . Our spectra were scaled to a constant flux value for F([OIII]lambda 5007) and recalibrated to an equivalent aperture and the narrow emission components were removed (for detailes see Shapovalova et al. 2004.) We found that, the emission line profiles of the broad Hbeta and Halpha present double peaks at radial velocities \tilde \plusmn 1000 km/s relative to the narrow component. The relative intensity and the radial velocity of these peaks change with time. In 2000 - 2003, we observed a third distinct peak in the red wings of Halpha and Hbeta , at a radial velocity of \tilde +2500 km/s. This peak moved gradually across the line profile towards lower radial velocities.
- Добавил в систему: Бочкарев Николай Геннадиевич