A review of diagnostic emission line ratios in the Narrow Line Region of Active Galactic Nuclei
نویسندگان
چکیده
منابع مشابه
Spatially-resolved Narrow Line Region Kinematics in Active Galactic Nuclei
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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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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Aims. We combine emission line and X-ray luminosities for 45 sources from the Chandra Deep Field South (CDF-S), and seven HELLAS sources, to obtain a new sample of 52 X-ray selected type-II active galactic nuclei (AGNs). Eighteen of our sources are very luminous with a typical, absorption-corrected 2–10 keV luminosity of f ew × 1044 ergs s−1 (type-II QSOs). Methods. We compare the emission line...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten: News in Astronomy and Astrophysics
سال: 1998
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.2123190602