scholarly journals ROSAT,ASCA, and OSSE Observations of the Broad‐Line Radio Galaxy 3C 120

1997 ◽  
Vol 487 (2) ◽  
pp. 636-643 ◽  
Author(s):  
P. Grandi ◽  
R. M. Sambruna ◽  
L. Maraschi ◽  
G. Matt ◽  
C. M. Urry ◽  
...  
Keyword(s):  
Radio Galaxy ◽  
Broad Line ◽  
3C 120

scholarly journals Robotic reverberation mapping of the broad-line radio galaxy 3C 120

2020 ◽  
Vol 497 (3) ◽  
pp. 2910-2929 ◽  
Author(s):  
Michael S Hlabathe ◽  
David A Starkey ◽  
Keith Horne ◽  
Encarni Romero-Colmenero ◽  
Steven M Crawford ◽  
...  
Keyword(s):  
Black Hole ◽  
Radio Galaxy ◽  
Mass Measurement ◽  
Broad Line ◽  
Reverberation Mapping ◽  
V Band ◽  
Symmetric Pattern ◽  
Multiple Line ◽  
Robotic Telescope ◽  
3C 120

ABSTRACT We carried out photometric and spectroscopic observations of the well-studied broad-line radio galaxy 3C 120 with the Las Cumbres Observatory (LCO) global robotic telescope network from 2016 December to 2018 April as part of the LCO AGN Key Project on Reverberation Mapping of Accretion Flows. Here, we present both spectroscopic and photometric reverberation mapping results. We used the interpolated cross-correlation function to perform multiple-line lag measurements in 3C 120. We find the H γ, He ii λ4686, H β, and He i λ5876 lags of $\tau _{\text{cen}} = 18.8_{-1.0}^{+1.3}$, $2.7_{-0.8}^{+0.7}$, $21.2_{-1.0}^{+1.6}$, and $16.9_{-1.1}^{+0.9}$ d, respectively, relative to the V-band continuum. Using the measured lag and rms velocity width of the H β emission line, we determine the mass of the black hole for 3C 120 to be $M=(6.3^{+0.5}_{-0.3})\times 10^7\, (f/5.5)$ M⊙. Our black hole mass measurement is consistent with similar previous studies on 3C 120, but with small uncertainties. In addition, velocity-resolved lags in 3C 120 show a symmetric pattern across the H β line, 25 d at line centre decreasing to 17 d in the line wings at ±4000 km s−1. We also investigate the inter-band continuum lags in 3C 120 and find that they are generally consistent with τ ∝ λ4/3 as predicted from a geometrically thin, optically thick accretion disc. From the continuum lags, we measure the best-fitting value τ0 = 3.5 ± 0.2 d at $\lambda _{\rm 0} = 5477\, \mathring{\rm A}$. It implies a disc size a factor of 1.6 times larger than prediction from the standard disc model with L/LEdd = 0.4. This is consistent with previous studies in which larger than expected disc sizes were measured.

scholarly journals RELATIVISTIC PLASMA AS THE DOMINANT SOURCE OF THE OPTICAL CONTINUUM EMISSION IN THE BROAD-LINE RADIO GALAXY 3C 120

2010 ◽  
Vol 715 (1) ◽  
pp. 355-361 ◽  
Author(s):  
J. León-Tavares ◽  
A. P. Lobanov ◽  
V. H. Chavushyan ◽  
T. G. Arshakian ◽  
V. T. Doroshenko ◽  
...  
Keyword(s):  
Radio Galaxy ◽  
Relativistic Plasma ◽  
Continuum Emission ◽  
Broad Line ◽  
Dominant Source ◽  
Optical Continuum ◽  
3C 120

MULTIWAVELENGTH VARIABILITY OF THE BROAD LINE RADIO GALAXY 3C 120

2009 ◽  
Vol 696 (1) ◽  
pp. 601-607 ◽  
Author(s):  
Kevin Marshall ◽  
Wesley T. Ryle ◽  
H. Richard Miller ◽  
Alan P. Marscher ◽  
Svetlana G. Jorstad ◽  
...  
Keyword(s):  
Radio Galaxy ◽  
Broad Line ◽  
Multiwavelength Variability ◽  
3C 120

scholarly journals Broad-line region structure and kinematics in the radio galaxy 3C 120

2014 ◽  
Vol 566 ◽  
pp. A106 ◽  
Author(s):  
W. Kollatschny ◽  
K. Ulbrich ◽  
M. Zetzl ◽  
S. Kaspi ◽  
M. Haas
Keyword(s):  
Radio Galaxy ◽  
Broad Line ◽  
Broad Line Region ◽  
Line Region ◽  
3C 120

scholarly journals TheXMM-Newtonview of the broad-line radio galaxy 3C 120

2004 ◽  
Vol 354 (3) ◽  
pp. 839-850 ◽  
Author(s):  
D. R. Ballantyne ◽  
A. C. Fabian ◽  
K. Iwasawa
Keyword(s):  
Radio Galaxy ◽  
Broad Line ◽  
3C 120

ASCAObservations of the Broad‐Line Radio Galaxy 3C 445

1998 ◽  
Vol 495 (2) ◽  
pp. 749-756 ◽  
Author(s):  
Rita M. Sambruna ◽  
I. M. George ◽  
R. F. Mushotzky ◽  
K. Nandra ◽  
T. J. Turner
Keyword(s):  
Radio Galaxy ◽  
Broad Line

scholarly journals Broadband X-Ray Observation of Broad-line Radio Galaxy 3C 109

2020 ◽  
Vol 897 (1) ◽  
pp. 47
Author(s):  
Sulov Chalise ◽  
Anne M. Lohfink ◽  
Erin Kara ◽  
Andrew C. Fabian
Keyword(s):  
Radio Galaxy ◽  
Broad Line ◽  
X Ray
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