Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.222...91b&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 222, no. 1-2, p. 91-106
Astronomy and Astrophysics
Astrophysics
2
Active Galactic Nuclei, Balmer Series, Emission Spectra, H Alpha Line, H Ii Regions, Quasars, Seyfert Galaxies, Chebyshev Approximation, Image Dissector Tubes, Kurtosis, Mathematical Models, Parabolas, Spectrographs
Scientific paper
90 emission line profiles, constituting 30 Balmer lines and 55 forbidden and 5 other permitted lines, from 31 objects comprising of S1, S2, S3 classes of Seyfert galaxies, H II regions and QSOs, are analyzed. A new mathematical representation of the profile is introduced by fitting the blue and red sides of the profile to Chebychev polynomials and the top to an inverted parabola. Parameters developed from these fittings are used to define indices of asymmetry and kurtosis. Asymmetry, kurtosis and Full Width at Half Maximum (FWHM) are computed for all the profiles. Results show good correlation between FWHM and kurtosis. Forbidden lines are found to be narrower and peakier, while Balmer lines and other permitted lines are broader and flatter. Futhermore, all lines are predominantly blueward asymmetric, although some significant redward asymmetry is exhibited by, in particular, forbidden lines of the S2 class and Balmer lines of the S1 class. No correlation is shown between asymmetry and kurtosis or between asymmetry and FWHM.
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