منابع مشابه
The Dynamical Evolution of Narrow Line Regions
We review recent progress by the RSAA team in elucidating the dynamical evolution of the various classes of Narrow Line Regions (NLR) in active galaxies.
متن کاملAre Seyfert Narrow Line Regions Powered by Radio Jets?
We argue that the narrow line regions of Seyfert galaxies are powered by the transport of energy and momentum by the radio-emitting jets. This implies that the ratio of the radio power to jet energy flux is much smaller than is usually assumed for radio galaxies. This can be partially attributed to the smaller ages (∼ 106 yrs) of Seyferts compared to radio galaxies but one also requires that ei...
متن کاملDusty, Radiation Pressure Dominated Photoionization. II. Multi-Wavelength Emission Line Diagnostics for Narrow Line Regions
Seyfert narrow line region (NLR) emission line ratios are remarkably uniform, displaying only ∼0.5 dex variation between galaxies, and even less within an individual object. Previous photoionization and shock models of this region were unable to explain this observation without the introduction of arbitrary assumptions or additional parameters. Dusty, radiation pressure dominated photoionizatio...
متن کاملThe Broad - Line and Narrow - Line Regions of the Liner Ngc 4579 1
We report the discovery of an extremely broad Hα emission line in the LINER nucleus of NGC 4579. From ground-based observations, the galaxy was previously known to contain a Type 1 nucleus with a broad Hα line of FWHM ≈ 2300 km s and FWZI ≈ 5000 km s. New spectra obtained with the Hubble Space Telescope (HST ) and a 0. 2-wide slit reveal an Hα component with a FWZI of ∼ 18,000 km s. The line is...
متن کاملThe Narrow Line Region: Current Models and Future Questions
I present a broad overview of modelling of the Narrow Line Region (NLR) of active galaxies, and discuss some of the more recent models we currently have for the emission from the NLR. I show why the emission line ratios from the NLR are constrained to certain observed values, and describe what physical parameters we can derive from observations using emission line models. Also presented are som...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1994
ISSN: 0074-1809
DOI: 10.1017/s0074180900176302