Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339..689v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 15, 1989, p. 689-699.
Astronomy and Astrophysics
Astrophysics
51
Active Galactic Nuclei, Emission Spectra, Line Spectra, Shock Waves, Abundance, Cosmic Gases, H Beta Line, Photoionization, Spectral Line Width
Scientific paper
Considering that the narrow emission-line region of active galactic nuclei (AGNs) is composed by clouds moving throughout a dilute gas, the emission line spectrum is calculated assuming the coupled effects of shock and photoionization. A comparison between the H-beta line produced by shock and by photoionization shows that these mechanisms could have comparable importance in determining the physical conditions. The contributions to H-beta are of the same order if the cloud velocity is not above 300 km/s and the ionization parameter is not greater than 10,000. Theoretical emission-line intensities are given for several lines, for a large range of the input parameters, in order to provide a practical method to analyze observational data. Comparison between theoretical and observed line ratios shows that the presence of shock must be considered when analyzing the emission-line spectrum of AGNs.
Contini Marcella
Viegas-Aldrovandi Sueli M.
No associations
LandOfFree
A guideline to the interpretation of the narrow emission-line spectra of active galactic nuclei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A guideline to the interpretation of the narrow emission-line spectra of active galactic nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A guideline to the interpretation of the narrow emission-line spectra of active galactic nuclei will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1735649