Theoretical hydrogen-line ratios for the narrow-line regions of active galactic nuclei
نویسندگان
چکیده
منابع مشابه
A New Dual-component Photoionization Model for the Narrow Emission-line Regions in Active Galactic Nuclei
Having found that type 1 Seyfert nuclei have excess [Fe VII] λ6087 emission with respect to type 2s, Murayama & Taniguchi have proposed that the high-ionization nuclear emission-line region (HINER) traced by the [Fe VII] λ6087 emission resides in the inner wall of dusty tori. The covering factor of the torus is usually large (e.g., ∼ 0.9). Further, electron density in the tori (e.g., ∼ 107–8 cm...
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We analyze optical (UV rest-frame) spectra of X-ray selected narrow-line QSOs at redshift 1.5 <∼ z <∼ 3.7 found in the Chandra Deep Field South and of narrow-line radio galaxies at redshift 1.2 <∼ z <∼ 3.8 to investigate the gas metallicity of the narrow-line regions and their evolution in this redshift range. Such spectra are also compared with UV spectra of local Seyfert 2 galaxies. The obser...
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We have analyzed Hubble Space Telescope spectroscopy of 24 nearby Active Galactic Nuclei (AGNs) to investigate spatially-resolved gas kinematics in the Narrow Line Region (NLR). These observations effectively isolate the nuclear line profiles on less than 100 parsec scales and are used to investigate the origin of the substantial scatter between the widths of strong NLR lines and the stellar ve...
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Controversy regarding whether Narrow Line Seyfert 1 galaxies (NLS1s) follow the same black hole — galactic bulge relation as normal galaxies has been raised by Mathur et al. (2001) and Ferrarese et al. (2001). In this paper, the correlation between the black hole mass and the velocity dispersion of the narrow line region, indicated by the [OIII] line width for a heterogeneous sample of NLS1s, i...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1984
ISSN: 0004-6280,1538-3873
DOI: 10.1086/131352