Radiative transfer in galactic disks…

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Presentation transcript:

Radiative transfer in galactic disks… Simone Bianchi INAF-Osservatorio Astrofisico di Arcetri, Firenze … using TRADING Transfer of RAdiation through Dust IN Galaxies (Bianchi 2008)

RT and the Monte Carlo Method The path of a phothon through dust Optimizations Extinction: scattering or absorption ? Out of dust: observed Emission from stars Photon weights Scattering phase function Forced Scattering (Cashwell & Everett 1959) Several images Peeling-off (Yusef-Zadeh et al. 1984) Continuous Absorption (Lucy 1999)

RT and the Monte Carlo Method Emission from dust Local ISRF J = W /(4 ) Absorbed energy Mean absorption coefficient j Dust Emission Coefficient Thermal & Stochastic heating Dust self absorption (iteratively) l.o.s. integration Scheme similar to DIRTY (Misselt et al. 2001)

Radiative Transfer models for a spiral (disk) galaxy Smooth exponential stellar disk + spheroidal bulge i = 40˚ i = 90˚ edge-on i = 85˚ i = 60˚ i = 80˚ i = 0˚ face-on + smooth exponential dust disk MC model for dust extinction Bianchi, Ferrara & Giovanardi (1996) Dust emission at thermal equilibrium Bianchi, Davies & Alton (2000) Extinction & Clumping Bianchi et al. (2000) On a regular grid

Real galaxies vs models + 6 other objects Bianchi (2007) NGC 5746 V band model K’ band model

TRADING: an adaptive grid for a clumpy medium 3-D Tree structure Octree Finer grid on a denser (more opaque) spot 1500 clouds Clumps of different size Resolution within the clump

Effective extinction in a clumpy ball Asmooth = 2000 ff=0.05 ff=0.025 400 and 1600 clumps, density contrast 4-8 10^4, density in clumps 2-4 10^-6 g/cm^3 A ≈ 1

Images Example: model of an NGC891-like galaxy seen at i=86 (Bianchi 2008) B, V, R About 1500 clumps, I would have needed 2048^3/20=4.3D8 regular cells instead than 3.6D6 B, V, R 70m, 160m, 850m

Spectral Energy Distribution Draine & Li (2007) dust

Summary of TRADING features An adaptive grid for dust Stellar emission from diffuse /point-like sources of different spectra Thermal & stochastic dust emission from a distribution of grain sizes and material Dust self-absorption. Model of the Cartwheel galaxy (Mapelli et al. 2008)