scholarly journals A Wind-based Unification Model for NGC 5548: Spectral Holidays, Nondisk Emission, and Implications for Changing-look Quasars

2019 ◽  
Vol 882 (2) ◽  
pp. L30 ◽  
Author(s):  
M. Dehghanian ◽  
G. J. Ferland ◽  
B. M. Peterson ◽  
G. A. Kriss ◽  
K. T. Korista ◽  
...  
Keyword(s):  
Ngc 5548

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.

scholarly journals Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy

2017 ◽  
Vol 846 (1) ◽  
pp. 55 ◽  
Author(s):  
S. Mathur ◽  
A. Gupta ◽  
K. Page ◽  
R. W. Pogge ◽  
Y. Krongold ◽  
...  
Keyword(s):  
Space Telescope ◽  
X Ray ◽  
Reverberation Mapping ◽  
Ngc 5548

scholarly journals Photoionized Hβ emission in NGC 5548: it breathes!

2005 ◽  
Vol 365 (4) ◽  
pp. 1180-1190 ◽  
Author(s):  
Edward M. Cackett ◽  
Keith Horne
Keyword(s):  
Ngc 5548

scholarly journals The Soft and Medium-Energy X-Ray Variability of NGC 5548: A Reanalysis of EXOSAT Observations

1996 ◽  
Vol 465 ◽  
pp. 181 ◽  
Author(s):  
G. Tagliaferri ◽  
G. Bao ◽  
G. L. Israel ◽  
L. Stella ◽  
A. Treves
Keyword(s):  
Medium Energy ◽  
X Ray ◽  
Ngc 5548

scholarly journals Anatomy of the AGN in NGC 5548

2015 ◽  
Vol 581 ◽  
pp. A79 ◽  
Author(s):  
M. Whewell ◽  
G. Branduardi-Raymont ◽  
J. S. Kaastra ◽  
M. Mehdipour ◽  
K. C. Steenbrugge ◽  
...  
Keyword(s):  
Ngc 5548

scholarly journals SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT.VI. REVERBERATING DISK MODELS FOR NGC 5548

2017 ◽  
Vol 835 (1) ◽  
pp. 65 ◽  
Author(s):  
D. Starkey ◽  
Keith Horne ◽  
M. M. Fausnaugh ◽  
B. M. Peterson ◽  
M. C. Bentz ◽  
...  
Keyword(s):  
Space Telescope ◽  
Reverberation Mapping ◽  
Ngc 5548

scholarly journals Feeding versus feedback in active galactic nuclei from near-infrared integral field spectroscopy – XII. NGC 5548

2016 ◽  
Vol 464 (2) ◽  
pp. 1771-1782 ◽  
Author(s):  
Astor J. Schönell ◽  
Thaisa Storchi-Bergmann ◽  
Rogemar A. Riffel ◽  
Rogério Riffel
Keyword(s):  
Active Galactic Nuclei ◽  
Near Infrared ◽  
Galactic Nuclei ◽  
Integral Field Spectroscopy ◽  
Field Spectroscopy ◽  
Ngc 5548 ◽  
Integral Field

scholarly journals XMM-NEWTON High resolution spectroscopy of NGC 5548

2003 ◽  
Vol 402 (2) ◽  
pp. 477-486 ◽  
Author(s):  
K. C. Steenbrugge ◽  
J. S. Kaastra ◽  
C. P. de Vries ◽  
R. Edelson
Keyword(s):  
High Resolution ◽  
High Resolution Spectroscopy ◽  
Ngc 5548

Testing Unified X-ray — UV Absorber Models with NGC 5548

1995 ◽  
pp. 245-246
Author(s):  
Smita Mathur ◽  
Martin Elvis ◽  
Belinda Wilkes
Keyword(s):  
X Ray ◽  
Uv Absorber ◽  
Ngc 5548
Sign in / Sign up

Export Citation Format

Share Document