Line and continuum variability in NGC 4151

2005 ◽  
pp. 9-17 ◽  
Author(s):  
M. A. J. Snijders
Keyword(s):  
Ngc 4151

scholarly journals Mass outflow of the X-ray emission line gas in NGC 4151

2020 ◽  
Vol 15 (S359) ◽  
pp. 131-135
Author(s):  
S. B. Kraemer ◽  
T. J. Turner ◽  
D. M. Crenshaw ◽  
H. R. Schmitt ◽  
M. Revalski ◽  
...  
Keyword(s):  
Emission Line ◽  
Total Mass ◽  
High Energy ◽  
Model Parameters ◽  
Zeroth Order ◽  
Space Telescope ◽  
X Ray ◽  
Ngc 4151 ◽  
Outflow Rate ◽  
Mass Outflow

AbstractWe have analyzed Chandra/High Energy Transmission Grating spectra of the X-ray emission line gas in the Seyfert galaxy NGC 4151. The zeroth-order spectral images show extended H- and He-like O and Ne, up to a distance r ˜ 200 pc from the nucleus. Using the 1st-order spectra, we measure an average line velocity ˜230 km s–1, suggesting significant outflow of X-ray gas. We generated Cloudy photoionization models to fit the 1st-order spectra; the fit required three distinct emission-line components. To estimate the total mass of ionized gas (M) and the mass outflow rates, we applied the model parameters to fit the zeroth-order emission-line profiles of Ne IX and Ne X. We determined an M ≍ 5.4 × 105Mʘ. Assuming the same kinematic profile as that for the [O III] gas, derived from our analysis of Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra, the peak X-ray mass outflow rate is approximately 1.8 Mʘ yr–1, at r ˜ 150 pc. The total mass and mass outflow rates are similar to those determined using [O III], implying that the X-ray gas is a major outflow component. However, unlike the optical outflows, the X-ray emitting mass outflow rate does not drop off at r > 100pc, which suggests that it may have a greater impact on the host galaxy.

On the path toward a universal outflow mechanism in light of NGC 4151 and NGC 1068

2020 ◽  
Vol 15 (S359) ◽  
pp. 283-284
Author(s):  
D. May ◽  
J. E. Steiner ◽  
R. B. Menezes
Keyword(s):  
Near Infrared ◽  
Feedback Mechanism ◽  
Data Cube ◽  
Low Velocity ◽  
Ionized Gas ◽  
Ngc 4151 ◽  
Molecular Outflow ◽  
Ngc 1068 ◽  
Field Unit ◽  
First Time

AbstractWe use near-infrared Integral Field Unit (IFU) data to analyze the galaxies NGC 4151 and NGC 1068, which have very different Eddington ratios - ˜50 times lower for NGC 4151. Together with a detailed data cube treatment methodology, we reveal remarkable similarities between both AGN, such as the detection of the walls of an “hourglass” structure for the low-velocity [Fe ii] emission with the high-velocity emission within this hourglass; a molecular outflow - detected for the first time in NGC 4151; and the fragmentation of an expanding molecular bubble into bullets of ionized gas. Such observations suggest that NGC 4151 could represent a less powerful and more compact version of the outflow seen in NGC 1068, suggesting a universal feedback mechanism acting in quite different AGN.

scholarly journals The Balmer lines in the Seyfert Galaxies NGC 5548 and NGC 4151

1972 ◽  
Vol 44 ◽  
pp. 155-159
Author(s):  
R. Weymann ◽  
R. Cromwell
Keyword(s):  
Electron Scattering ◽  
Small Volume ◽  
Seyfert Galaxies ◽  
Ngc 4151 ◽  
Transient Nature ◽  
Balmer Lines ◽  
Ngc 5548

The profiles of the Balmer lines in NGC 5548 as reported by Dibai et al. (1968) were somewhat asymmetric, whereas those reported by Anderson (1970) are smooth and symmetric. We present profiles which are strongly asymmetric, resembling those of Dibai et al. Evidently electron scattering is not the sole principal broadening agent and we must deal with velocities ∼ 2500 km s−1 in a very small volume.The transient nature of the P-Cygni type profiles in the Balmer lines of NGC 4151 has previously been noted (Cromwell and Weymann, 1970). These lines have since disappeared, at the resolution available to us, in a time of 3 months. A model in which frequent outbursts of shells or filaments produce transient features in the Balmer lines, while the accumulated material from past outbursts produces the relatively stable HeI λ 3889 feature, seems the most plausible.

Optical spectral variability of NGC 4151 during 1990

1997 ◽  
Vol 14 (2) ◽  
pp. 105-118 ◽  
Author(s):  
V. L. Oknyanskij ◽  
E. Van Groningen
Keyword(s):  
Spectral Variability ◽  
Ngc 4151

scholarly journals Optical monitoring of the Seyfert galaxy NGC 4151 and possible periodicities in its historical light curve

2014 ◽  
Vol 14 (8) ◽  
pp. 923-932 ◽  
Author(s):  
Di-Fu Guo ◽  
Shao-Ming Hu ◽  
Jun Tao ◽  
Hong-Xing Yin ◽  
Xu Chen ◽  
...  
Keyword(s):  
Light Curve ◽  
Seyfert Galaxy ◽  
Optical Monitoring ◽  
Ngc 4151

scholarly journals The Mass of the Central Black Hole in the Seyfert Galaxy NGC 4151

2006 ◽  
Vol 647 (2) ◽  
pp. 901-909 ◽  
Author(s):  
Kyle G. Metzroth ◽  
Christopher A. Onken ◽  
Bradley M. Peterson
Keyword(s):  
Black Hole ◽  
Seyfert Galaxy ◽  
Central Black Hole ◽  
Ngc 4151

scholarly journals X-Ray Structure between the Innermost Disk and Optical Broad-line Region in NGC 4151

2018 ◽  
Vol 865 (2) ◽  
pp. 97 ◽  
Author(s):  
J. M. Miller ◽  
E. Cackett ◽  
A. Zoghbi ◽  
D. Barret ◽  
E. Behar ◽  
...  
Keyword(s):  
Broad Line ◽  
X Ray ◽  
Ngc 4151 ◽  
Broad Line Region ◽  
Line Region

scholarly journals The Black Hole Mass of NGC 4151: Comparison of Reverberation Mapping and Stellar Dynamical Measurements

2007 ◽  
Vol 670 (1) ◽  
pp. 105-115 ◽  
Author(s):  
Christopher A. Onken ◽  
Monica Valluri ◽  
Bradley M. Peterson ◽  
Richard W. Pogge ◽  
Misty C. Bentz ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Mass ◽  
Reverberation Mapping ◽  
Ngc 4151
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