Space Telescope Imaging Spectrograph Echelle Observations of the Seyfert Galaxy NGC 4151: Physical Conditions in the Ultraviolet Absorbers

2001 ◽  
Vol 551 (2) ◽  
pp. 671-686 ◽  
Author(s):  
S. B. Kraemer ◽  
D. M. Crenshaw ◽  
J. B. Hutchings ◽  
I. M. George ◽  
A. C. Danks ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
Space Telescope ◽  
Physical Conditions ◽  
Ngc 4151 ◽  
Ultraviolet Absorbers ◽  
Imaging Spectrograph

Space Telescope Imaging Spectrograph Long‐Slit Spectroscopy of the Narrow‐Line Region of NGC 4151. II. Physical Conditions along Position Angle 221o

2000 ◽  
Vol 531 (1) ◽  
pp. 278-295 ◽  
Author(s):  
S. B. Kraemer ◽  
D. M. Crenshaw ◽  
J. B. Hutchings ◽  
T. R. Gull ◽  
M. E. Kaiser ◽  
...  
Keyword(s):  
Position Angle ◽  
Narrow Line ◽  
Space Telescope ◽  
Physical Conditions ◽  
Ngc 4151 ◽  
Line Region ◽  
Narrow Line Region ◽  
Imaging Spectrograph

Extragalactic y-rays

1981 ◽  
Vol 301 (1462) ◽  
pp. 577-602 ◽  
Keyword(s):  
Radio Galaxy ◽  
Line Emission ◽  
Seyfert Galaxy ◽  
Active Galaxies ◽  
Physical Conditions ◽  
Ngc 4151 ◽  
High Energies

Only a few extragalactic objects have been studied in the y-ray region of the spectrum. At high energies the COS-B experiment detected emission from the quasar 3C273 while at lower energies the results indicate that the emission from the Seyfert galaxy NGC 4151 is variable. A similar variability may also account for the conflicting reports of line emission from the radio galaxy Cen A. The implication of these and other observations in relation to the possible physical conditions in the nuclei of active galaxies.

Space Telescope Imaging Spectrograph Echelle Observations of NGC 4151: Variable Ionization of the Intrinsic UV Absorbers

2000 ◽  
Vol 545 (1) ◽  
pp. L27-L30 ◽  
Author(s):  
D. M. Crenshaw ◽  
S. B. Kraemer ◽  
J. B. Hutchings ◽  
A. C. Danks ◽  
T. R. Gull ◽  
...  
Keyword(s):  
Space Telescope ◽  
Ngc 4151 ◽  
Uv Absorbers ◽  
Imaging Spectrograph

Space Telescope Imaging Spectrograph Long‐Slit Spectroscopy of the Narrow‐Line Region of NGC 4151. I. Kinematics and Emission‐Line Ratios

2000 ◽  
Vol 531 (1) ◽  
pp. 257-277 ◽  
Author(s):  
C. H. Nelson ◽  
D. Weistrop ◽  
J. B. Hutchings ◽  
D. M. Crenshaw ◽  
T. R. Gull ◽  
...  
Keyword(s):  
Emission Line ◽  
Narrow Line ◽  
Space Telescope ◽  
Ngc 4151 ◽  
Line Region ◽  
Narrow Line Region ◽  
Imaging Spectrograph

scholarly journals Simultaneous Ultraviolet and X‐Ray Observations of Seyfert Galaxy NGC 4151. I. Physical Conditions in the X‐Ray Absorbers

2005 ◽  
Vol 633 (2) ◽  
pp. 693-705 ◽  
Author(s):  
S. B. Kraemer ◽  
I. M. George ◽  
D. M. Crenshaw ◽  
J. R. Gabel ◽  
T. J. Turner ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
X Ray ◽  
Physical Conditions ◽  
Ngc 4151

scholarly journals Simultaneous Ultraviolet and X‐Ray Observations of the Seyfert Galaxy NGC 4151. II. Physical Conditions in the UV Absorbers

2006 ◽  
Vol 167 (2) ◽  
pp. 161-176 ◽  
Author(s):  
S. B. Kraemer ◽  
D. M. Crenshaw ◽  
J. R. Gabel ◽  
G. A. Kriss ◽  
H. Netzer ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
X Ray ◽  
Physical Conditions ◽  
Ngc 4151 ◽  
Uv Absorbers

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.

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
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