Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..117a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 117-126.
Astronomy and Astrophysics
Astrophysics
13
Active Galactic Nuclei, Galactic Evolution, Luminosity, Seyfert Galaxies, Abundance, Astronomical Photometry, Astronomical Spectroscopy, Elliptical Galaxies, Emission Spectra, Radio Galaxies
Scientific paper
The spectral properties of the active nucleus ESO 138 G1 are analyzed. The continuous energy distribution is monitored over the wavelength range 3400-9700. A detailed analysis of the emission lines reveals that there exists in this object a stratification of the emitting gas clouds according to their density and dominant ionization stage. The width of the lines is observed to correlate with their critical density. The N/O abundance ratio in the gas is about three times larger than the solar value. Compared to the other two active nuclei which are known so far to exhibit such a high excitation line spectrum, IIIZw77 and Tol 0109-383, ESO 138 G1 builds up a sequence of spectral properties which can be understood if the mean electron density and the excitation of the gas clouds decrease from IIIZw77 to ESO 138 G1.
Alloin Danielle
Bica Eduardo
Bonatto Ch.
Prugniel Philippe
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