Erratum to: The active galaxy NGC 4151: Archetype or exception?
نویسندگان
چکیده
منابع مشابه
NGC 4151 – A unified active galactic nucleus
We present a unified picture of active galactic nuclei which we construct from a detailed model of line emission in the active source in NGC 4151. This source provides us with an opportunity to explore the variation of structure with luminosity in an object which, in the model, derives its unusual properties as a consequence of the angle of the accretion disc to the line of sight. The key featu...
متن کاملRadiation processes in the Seyfert galaxy NGC 4151
Aims. The main aim of this work was to investigate if the radiative process photoexcitation by accidental resonance (PAR) is producing Fe II lines in the UV region of NGC 4151. At the same time I searched for collisionally excited Fe II emission. While doing so, the broad line region (BLR), intermediate line region (ILR) and narrow line region (NLR) contributions to the Mg II resonance doublet ...
متن کاملOSSE Observations of NGC 4151
We report results of a two-week observation of the Seyfert galaxy NGC 4151 with the Oriented Scintillation Spectrometer Experiment (OSSE) instrument on the Compton Gamma Ray Observatory (GRO). The source had a very soft spectrum which is best represented by a broken power law or Sunyaev-Titarchuk thermal Comptonization model. It can be characterized by an exponential shape with an e-folding ene...
متن کاملSTIS Echelle Observations of the Seyfert Galaxy NGC 4151 : Physical Conditions in the Ultraviolet Absorbers
We have examined the physical conditions in intrinsic UV-absorbing gas in the Seyfert galaxy NGC 4151, using echelle spectra obtained with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) on 1999 July 19. We confirm the presence of the kinematic components detected in earlier Goddard High Resolution Spectrograph (GHRS) observations, all of which appear to be o...
متن کاملMass Outflow from the Nucleus of the Seyfert 1 Galaxy NGC 4151
We present an analysis of UV and optical spectra of NGC 4151 obtained at high spectral and angular resolutions with the Hubble Space Telescope's (HST's) Space Telescope Imaging Spectrograph (STIS). We identify a kinematic component of the emission lines that has a width of 1170 km s −1 (FWHM), intermediate between those from the broad and narrow (emission) line regions (BLR and NLR). We present...
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ژورنال
عنوان ژورنال: The Astronomy and Astrophysics Review
سال: 2000
ISSN: 0935-4956,1432-0754
DOI: 10.1007/s001590000012