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- W2352005628 abstract "We summarized the main observational properties of Narrow_line Seyfert Galaxies(Including more luminous QSOs). Thereafter, we discuss their physical implications, the theoretic interpretations and the indications on the inner structures of Active Galactic Nuclei(AGNs). Narrow_line Serfert Galaxies(NLS1s) are identified as the Narrow Hβ permitted emission lines in their optical spectra, in which the properties of Seyfert Ⅰ and Ⅱ galaxies are presented partically. NLS1s with the strongest optical FeⅡ line blends and weak forbidden lines, obviously differ from SeyfertⅡ galaxies. Classified as the subclass of normal Seyfert Ⅰ galaxies, NLS1s have the extreme properties of the observational parameters in Principal Components Analysis(PCA). Therefore, they are the primary objects to understand the characteristics and structures of board emission line region and the innermost machines surrounding the central black hole. By means of PCA,NLSI s locate in the extreme end of the Board_line AGNs, such as (1)the narrowest H β line, (2)the largest ratio of Fe Ⅱλ4507/ H β , (3)the largest ratio of Si Ⅲ]λ1892/C Ⅲ]λ1909 indicating electron density of board line clouds in a certain range, (4)the largest C Ⅳλ1549 emission line blueshift, (5)the steepest soft X ray photon spectrum index, (6)the giant amplitude of the soft X ray excess variance. Following the above observational properties and statistical analysis results ( H β FWHM vs. other observation quantities), we comment that the L/L Edd model is the best interpretation. As the prediction of this model, NLS1s have a reasonably estimate of the low black hole masses. On the other hand, the non_spherical structure of AGNs possibly rises the anisotropic velocitis dispersion. The orientation effect can not be neglected when we try to build the kinetic model of NLS1s. The high accretion rate model with the orientation effect should let us to understand the dominant emission mechanism of AGNs and its influence on the observational properties." @default.
- W2352005628 created "2016-06-24" @default.
- W2352005628 creator A5049014435 @default.
- W2352005628 date "2002-01-01" @default.
- W2352005628 modified "2023-09-25" @default.
- W2352005628 title "NARROW-LINE SEYFERT I GALAXIES" @default.
- W2352005628 hasPublicationYear "2002" @default.
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