scholarly journals 3D radiative transfer modelling of the dusty tori around active galactic nuclei as a clumpy two-phase medium

2012 ◽  
Vol 420 (4) ◽  
pp. 2756-2772 ◽  
Author(s):  
Marko Stalevski ◽  
Jacopo Fritz ◽  
Maarten Baes ◽  
Theodoros Nakos ◽  
Luka Č. Popović
Keyword(s):  
Radiative Transfer ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Two Phase ◽  
Phase Medium ◽  
Transfer Modelling

scholarly journals AGN polarization modeling with Stokes

2006 ◽  
Vol 2 (S238) ◽  
pp. 375-376 ◽  
Author(s):  
René W. Goosmann ◽  
C. Martin Gaskell ◽  
Masatoshi Shoji
Keyword(s):  
Monte Carlo ◽  
Radiative Transfer ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Dust Grains ◽  
Free Electrons ◽  
Wide Range ◽  
Polarization Spectra

AbstractWe introduce a new, publicly available Monte Carlo radiative transfer code, Stokes, which has been developed to model polarization induced by scattering of free electrons and dust grains. It can be used in a wide range of astrophysical applications. Here, we apply it to model the polarization produced by the equatorial obscuring and scattering tori assumed to exist in active galactic nuclei (AGNs). We present optical/UV modeling of dusty tori with a curved inner shape and for two different dust types. The polarization spectra enable us to clearly distinguish between the two dust compositions. The Stokes code and its documentation can be freely downloaded from http://www.stokes-program.info/.

scholarly journals Megamaser Dics-Rings in Active Galactic Nuclei

2001 ◽  
Vol 205 ◽  
pp. 338-339
Author(s):  
Yu Zhi-yao
Keyword(s):  
Water Vapor ◽  
Radiative Transfer ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Transfer Velocity ◽  
Ngc 1068

We present results from fitting of water-vapor megamaser emission from NGC 4258 and NGC 1068. Using the radiative transfer, velocity, and coordinate equations, we derive parameters of the maser disc-rings.

Modelling the silicate emission features in type 1 AGNs: Dusty torus and disk+outflow models

2019 ◽  
Vol 15 (S359) ◽  
pp. 352-354
Author(s):  
M. Martínez-Paredes ◽  
I. Aretxaga
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Emission Feature ◽  
Two Phase ◽  
Dust Composition ◽  
Dusty Torus

AbstractWe investigated how the most common dusty torus models reproduce both the 10 and 18μm silicate emission features observed in the nuclear infrared (IR) Spitzer spectrum of type 1 active galactic nuclei (AGN). We use a sample of type 1 AGN for which the Spitzer spectrum is mostly dominated by the emission of the AGN (>80%), and the 10μm silicate emission feature is prominent (1σSi10μm > 0.28). The models are the smooth dusty torus models from Fritz et al., the clumpy dusty torus models from Nenkova et al. and Hoenig et al., the two-phase media torus model from Stalevski et al., and the disk+outflow model from Hoenig et al. These models differ by assuming either different geometry or dust composition. We found that in general, all models have difficulties reproducing the shape and peak of the silicate emission features, but the disk+outflow model is the best reproducing the AGN-dominated Spitzer spectrum.

scholarly journals LINE-DRIVEN DISK WINDS IN ACTIVE GALACTIC NUCLEI: THE CRITICAL IMPORTANCE OF IONIZATION AND RADIATIVE TRANSFER

2014 ◽  
Vol 789 (1) ◽  
pp. 19 ◽  
Author(s):  
Nick Higginbottom ◽  
Daniel Proga ◽  
Christian Knigge ◽  
Knox S. Long ◽  
James H. Matthews ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Critical Importance

scholarly journals Experimental study of radiative transfer in semi-transparent composite materials at different temperatures

2021 ◽  
Vol 2116 (1) ◽  
pp. 012062
Author(s):  
F Retailleau ◽  
V Allheily ◽  
L Merlat ◽  
J-F Henry ◽  
J Randrianalisoa
Keyword(s):  
Radiative Transfer ◽  
Glass Fibers ◽  
Homogeneous Medium ◽  
Radiative Properties ◽  
Resin Matrix ◽  
Two Phase ◽  
Heated Sample ◽  
Phase Medium ◽  
Different Temperatures ◽  
Transparent Composite

Abstract This study deals with the analysis of the propagation of radiation within a diffusing semi-transparent composite medium with rough boundaries. The two-phase medium (resin matrix and glass fibers reinforcement) is treated as an equivalent homogeneous medium characterized by volumetric radiative properties (extinction coefficient, albedo and phase function) and boundary scattering properties. The aim is to identify the radiative properties at different temperatures ranging from room temperature to 200°C. The identification method (Gauss-Newton) uses bidirectional reflectance and transmittance values. The experimental results are obtained using a spectrophotometer equipped with a goniometer and a heated sample holder. The Monte Carlo method is used to solve the Radiative Transfer Equation (RTE) in order to obtain the theoretical values.

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