On X-ray variability in narrow-line and broad-line active galactic nuclei
نویسندگان
چکیده
منابع مشابه
On X-ray variability in narrow line and broad line AGNs
We assembled a sample of broad line and narrow lines AGNs observed by ASCA, whose excess variances have been determined. The central black hole masses in this sample can be obtained from the reverberation mapping method and the width of Hβ emission line. Using the black hole masses and the bolometric luminosity, the Eddington ratio can also be obtained. We confirmed the strong anti-correlation ...
متن کاملThe Correlation of Narrow Line Emission and X-ray Luminosity in Active Galactic Nuclei
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...
متن کاملSpatially-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...
متن کاملThe Broad-Line Region in Active Galactic Nuclei
We review the basic observed and inferred properties of the broad emission-line region in AGNs, as well as the basics of the reverberation-mapping technique that can be used to determine the size and structure of the region. We argue that the current best evidence points to a multi-component line-emitting region, with a disk-like structure, possibly an extension of the accretion disk itself, an...
متن کاملThe Broad Line Region in Active Galactic Nuclei
We review constraints on models of the broad line region that are imposed by observations of the emission lines in Active Galactic Nuclei. Comparison of high and low ionization lines in sources with FWHM Hβ ≤4000 km s points toward low ionization line emission produced in a flattened geometry (the accretion disk?) with an associated high ionization wind. It remains unclear whether these results...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06650.x