ngc 4151
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2021 ◽  
Vol 5 (7) ◽  
pp. 172
Author(s):  
S. Grafton-Waters ◽  
M. Ahmed ◽  
S. Henson ◽  
F. Hinds-Williams ◽  
B Ivanova ◽  
...  

2021 ◽  
Vol 916 (1) ◽  
pp. 25
Author(s):  
Caroline A. Roberts ◽  
Misty C. Bentz ◽  
Eugene Vasiliev ◽  
Monica Valluri ◽  
Christopher A. Onken

2021 ◽  
Vol 76 (3) ◽  
pp. 255-268
Author(s):  
N. A. Tikhonov ◽  
O. A. Galazutdinova
Keyword(s):  
Ngc 4151 ◽  
Ngc 1068 ◽  

2021 ◽  
Vol 47 (5) ◽  
pp. 291-306
Author(s):  
D. Yu. Tsvetkov ◽  
N. N. Pavlyuk ◽  
O. V. Vozyakova ◽  
N. I. Shatsky ◽  
A. M. Tatarnikov ◽  
...  
Keyword(s):  
Type Ii ◽  

2021 ◽  
Vol 909 (2) ◽  
pp. 205
Author(s):  
Michał Szanecki ◽  
Andrzej Niedźwiecki ◽  
Andrzej A. Zdziarski
Keyword(s):  

2021 ◽  
Vol 503 (4) ◽  
pp. 5877-5893
Author(s):  
Subhashree Swain ◽  
P Shalima ◽  
K V P Latha ◽  
Krishna B S Swamy

ABSTRACT We model the near-infrared (NIR) spectral energy distribution (SED) of NGC 4151 with a 3D radiative transfer skirt code, using which torus only (TO) and ring and torus (RAT) scenarios are studied. In the RAT models, a graphite ring-like structure (clumpy or smooth) is incorporated between the torus and the accretion disc. We vary the inclination angle (i), inner radius (of the torus and the ring, Rin,t and Rin,r, respectively), torus half-opening angle (σ), optical depth ($\tau _{9.7, \rm t}$ of the torus and $\tau _{9.7, \rm r}$ of the ring), and the dust clump size (Rclump). We perform a statistical analysis of the parameter space and find that all the models are able to explain the flat NIR SED of NGC 4151 with minor differences in the derived parameters. For the TO model, we get Rin,t = 0.1 pc, σ = 30°, i = 53°, $\tau _{9.7, \rm t} = 10$, and the clumpsize, Rclump = 0.4 pc. For the smooth RAT model, $R_{\rm in, \rm r} = 0.04$ pc and $\tau _{9.7, \rm total}$ = 11 and for the clumpy RAT model, Rin,r = 0.04 pc/0.06 pc and $\tau _{9.7, \rm total} = 20$. The Rin,t from the TO model does not agree with the NIR observations (∼0.04 pc). Hence, the most likely scenario is that a hot graphite ring is located at a distance 0.04 pc from the centre, composed of a smooth/clumpy distribution of dust followed by a dusty torus at 0.1 pc with interstellar medium type of grains.


Author(s):  
Д. Ю. Цветков ◽  
Н. Н. Павлюк ◽  
О. В. Возякова ◽  
Н. И. Шатский ◽  
А. М. Татарников ◽  
...  
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2020 ◽  
Vol 902 (1) ◽  
pp. 26 ◽  
Author(s):  
W. Yuan ◽  
M. M. Fausnaugh ◽  
S. L. Hoffmann ◽  
L. M. Macri ◽  
B. M. Peterson ◽  
...  
Keyword(s):  

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