Echo mapping of broad H-beta emission in NGC 5548

1991 ◽  
Vol 367 ◽  
pp. L5 ◽  
Author(s):  
Keith Horne ◽  
William F. Welsh ◽  
Bradley M. Peterson
Keyword(s):  
Ngc 5548 ◽  
Beta Emission

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 PROMPT BETA SPECTROSCOPY AS A DIAGNOSTIC FOR MIX IN IGNITED NIF CAPSULES

2006 ◽  
Vol 21 (13) ◽  
pp. 1029-1040 ◽  
Author(s):  
A. C. HAYES ◽  
GERARD JUNGMAN ◽  
J. C. SOLEM ◽  
P. A. BRADLEY ◽  
R. S. RUNDBERG
Keyword(s):  
Laser Beam ◽  
Beam Energy ◽  
High Energy ◽  
Shell Material ◽  
National Ignition Facility ◽  
Confinement Fusion ◽  
Order Of Magnitude ◽  
Beta Spectroscopy ◽  
Fundamental Physical ◽  
Beta Emission

The National Ignition Facility (NIF) technology is designed to drive deuterium–tritium (DT) internal confinement fusion (ICF) targets to ignition using indirect radiation from laser beam energy captured in a hohlraum. Hydrodynamical instabilities at interfaces in the ICF capsule leading to mix between the DT fuel and the ablator shell material are of fundamental physical interest and can affect the performance characteristics of the capsule. Here we describe new radiochemical diagnostics for mix processes in ICF capsules with plastic or Be (0.9% Cu ) ablator shells. Reactions of high-energy tritons with shell material produce high-energy β-emitters. We show that mix between the DT fuel and the shell material enhances high-energy prompt beta emission from these reactions by more than an order of magnitude over that expected in the absence of mix. We further show how a mix signal could be detectable in an ignition failure regime corresponding to yields greater than about 2 kJ.

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

Coulomb Fragmentation of Molecules Following Beta Emission

1969 ◽  
Vol 22 (15) ◽  
pp. 753-755 ◽  
Author(s):  
M. Berman ◽  
G. B. Beard
Keyword(s):  
Beta Emission

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
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