Spectral observations of active galaxies nuclei in the visual range carried out during many years. I. The NGC 1275 galaxy.
In 1972 - 1976 on the spectrograph with image tube installed on the 2.6-m Shain telescope at the Crimean Astrophysical Observatory spectrograms of the NGC 1275 galaxy nucleus were obtained in Hβ and Hα regions for 108 and 90 dates, correspondingly. The equivalent widths (Wλ) of the following lines and blends: Hβ, [O III] λλ4959+5007, [O I] λ6300 and Hα+[N II] with an accuracy close to ±(15 - 25)% are determined. It has been shown, that with the given accuracy during the whole observational period the intensity of the enumerated emission features remained unvariable. It has been concluded that in the circumnuclear region of the galaxy the gas, which would be responsible for the appearance of the intensive broad components of the permitted emission lines, is practically absent. Based on this conclusion the author classifies the galaxy nucleus as Sy 2. A qualitative description of the form of profiles of several emission lines being in the state of low brightness of the nucleus, is given. Evidences for a noticeable stratification of gas emitting various lines are obtained.
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- Active Galactic Nuclei;
- Galactic Radiation;
- Visible Spectrum;
- Light Curve;
- Spectral Line Width;
- Spectrum Analysis;
- Seyfert Galaxies: Galactic Nuclei;
- Pairs: Galactic Nuclei