Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..559a&link_type=abstract
Astrophysical Journal, Part 1, vol. 257, June 15, 1982, p. 559-569.
Astronomy and Astrophysics
Astrophysics
74
Emission Spectra, Galactic Nuclei, Seyfert Galaxies, Spectral Line Width, Spectrophotometry, Continuous Spectra, Electron Density (Concentration), Electron Energy, Forbidden Bands, H Lines, High Resolution, Molecular Clouds, Spectrum Analysis
Scientific paper
Echelle spectrometry of two Seyfert galaxies, NGC 3783 and Markarian 509, is used to investigate the narrow and broad emission-line profiles. In NGC 3783 it is found that while the narrow emission lines have smooth profiles, they must be the summation of a number of components having different electron densities and/or temperatures. In Markarian 509 the forbidden S II and N II line profiles are similar to those of forbidden O III, suggesting that the physical conditions as a function of velocity are more homogeneous than for NGC 3783. The broad H-alpha and H-beta lines in both galaxies have approximately identical profiles. For Mrk 509, a cross-correlation of the two profiles indicates that the number of optically thin unresolved clouds needed to make up the emission line region is greater than about 50,000.
Atwood Bill
Baldwin John A.
Carswell Robert F.
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