Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..554g&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 6, Sept.-Oct. 1980, p. 554-558.) Soviet Astronomy Letters, vol. 6, Sept.-Oct. 1980, p.
Astronomy and Astrophysics
Astronomy
1
Astronomical Spectroscopy, Emission Spectra, Galactic Nuclei, Spectrophotometry, Abundance, Continuous Spectra, Electron Density (Concentration), Hot Stars, Interstellar Extinction, Interstellar Matter, Luminosity, Lyman Spectra, Photoionization, Radiant Flux Density, Recombination Reactions, Supernova Remnants
Scientific paper
Spectra of the nucleus of the galaxy NGC 5929 obtained with the 1.25-m and 6-m telescopes show emission lines with separate components in the wings. The physical parameters of the nucleus are estimated (assuming a temperature of 10,000 K for the radiating gas): electron density of about 400 cu cm, flux density of about 2.49 x 10 to the -14th erg sq cm/sec, luminosity of about 3.85 x 10 to the 39th erg/sec. The relative abundance of several ions is evaluated. Lyman continuum emission by hot young stars may be responsible for ionizing the gas in the nucleus. About 1000 type O5 V stars would be needed to maintain the gas in ionization-recombination equilibrium. For the emission-line spectrum to result from shock heating of the gas is inconsistent with the observational evidence.
Golev V. K.
Petrov G. T.
Yankulova I. M.
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