Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182....9p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 1, Aug. 1987, p. 9-14.
Astronomy and Astrophysics
Astrophysics
11
Abundance, Emission Spectra, Galactic Nuclei, Iron, Line Spectra, Molecular Excitation, Astronomical Spectroscopy, Spectrum Analysis
Scientific paper
Measurements of the forbidden Fe X 6374.5 A and Fe XIV 5303 A emission lines in NGC 4151 obtained from high-resolution data are presented. The line blends are analyzed using a quantitative separation technique. It is observed that the forbidden Fe X line emission can be represented by a single component corresponding to the forbidden O I, O III core emission; the forbidden Fe X line emission in NGC 4151 occurs at the emission systemic velocity with a value FWHM of about 200 km/sec. It is detected that the forbidden Fe XIV 5303 emission decreases marginally when both the continuum and the broad Balmer component drop. The forbidden Fe X/Fe XI and Fe XIV/Fe X line ratios are computed and compared with theoretical predictions. It is noted that the ratios do not permit discrimination between collisional and photoionized models.
Alloin Danielle
Bica Eduardo
Pelat Didier
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