Investigation of the amorphous nucleus region of the galaxy NGC 6217.
Abstract
Photographic and spectroscopic observations in the wavelength range from 3340 to 7400 A are used to construct the continuous spectrum of the nucleus and various parts of the nuclear region of the SBbc galaxy NGC 6217 both across and along the bar. It is shown that the nuclear continuum at a radius of 5 arcsec is flat, that the contribution from late-type stars becomes noticeable at larger distances from the center, and that the nucleus is characterized by an emission-line spectrum. The H-beta luminosity of the nucleus is determined to be 8 x 10 to the 39th erg/s; an electron density of 10,000 per cu cm and an electron temperature of 12,000 K are derived from various permitted and forbidden emission-line intensity ratios. The mass of emitting gas in the nucleus is estimated to be 17 million solar masses, and an effective radius of roughly 26 pc is obtained for the emission region
- Publication:
-
Trudy Kazanskaia Gorodkoj Astronomicheskoj Observatorii
- Pub Date:
- 1978
- Bibcode:
- 1978TrKaz..42..192K
- Keywords:
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- Astronomical Spectroscopy;
- Continuous Spectra;
- Galactic Nuclei;
- Galactic Radiation;
- Amorphous Materials;
- Astronomical Photography;
- Electron Density (Concentration);
- Electron Energy;
- Emission Spectra;
- H Lines;
- Infrared Spectra;
- Late Stars;
- Line Spectra;
- Nitrogen;
- Spectral Line Width;
- Spectrum Analysis;
- Stellar Spectra;
- Sulfur;
- Astrophysics;
- Galactic Nuclei:Spectra