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Determination of NGC 4151 Nucleus Mass from Parameters of Narrow Satellites of Broad Linesстатья
- Автор: Bochkarev N.G.
- Сборник: The Hot Universe
- Серия: IAU Symposium
- Том: 188
- Год издания: 1998
- Первая страница: 421
- Аннотация: The NGC 4151 optical spectra obtained with the 6-m telescope (after the deep minima in spring, 1984, in March- -April, 1986, in March-June, 1987) showed very weak broad emission lines, specially during 1987. An analysis of the radial velocities of the faint spectral features has proved that a fraction of them can be narrow satellites of the Balmer H beta - H delta and HeII 4686 A lines with radial velocities of -7500 and +9500 km/s. Qualitatively the satellites are similar to the narrow satellites of CIV 1550 A line observed by IUE during 1984, but with a little different velocities. In the model of two jets outflowing from a nucleus in opposite directions at the same velocity and emitting in each line at different distances from the nucleus which are, however, identical for both satellites, it follows from the values of carbon and hydrogen satellites that the hydrogen lines are generated in the region with a lower gravitational potential, but with a higher velocity of matter. The jet velocity is 7000-24000 km/s, with its value in the hydrogen- -line luminosity region being 20% as high as in the CIV-line luminosity region. The difference in the gravitational potentials Z (G) of the formation regions of the two lines is about 0.001, which is \gt30% of the Z (G) value. The Z (G) value at these distances may be used to estimate the mass of the nucleus which proves to be M = (1-3)x10$^8$M of the Sun.
- Добавил в систему: Бочкарев Николай Геннадиевич