Other
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95...12o&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 95, Jan. 1983, p. 12-17.
Other
30
Astronomical Spectroscopy, Radio Galaxies, Absorption Spectra, Continuous Spectra, Galactic Nuclei, High Resolution, Magnesium, Visible Spectrum
Scientific paper
It is pointed out that high-dispersion, long-exposure spectral scans have recently been obtained in an attempt to detect in the nucleus the Mg I b 5175-A absorption feature, which is the best signal of a galaxy in this situation. Even though difficult to see because it is between fairly strong forbidden N I 5199-A and weak forbidden Fe VII 5159-A emission lines, the Mg I feature is definitely present in the nucleus of Cyg A. Its equivalent width is about 2.3 A. If the underlying galaxy possesses an absorption-line spectrum similar to a giant elliptical, this would correspond to about 0.4 of the optical continuum near 5175 A coming from the galaxy, and 0.6 from the featureless continuum of the active nucleus. Whereas late-type spirals have weaker Mg I b absorption, other features, such as Fe II 5269 A, then have a comparable strength. These features are not seen in Cyg A nucleus scans. Measurements of a few additional emission-line strengths in the near infrared spectrum of Cyg A are presented.
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