dust emission by agn and starbursts n.
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Dust emission by AGN and starbursts - PowerPoint PPT Presentation


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-Starbursts (SB): Dust models and SED -Observations: MIR spectra of SB viz. AGN -Physics: Dust and X-rays -Radiative transfer: 3 parameter models? -AGN unification: The 10 μ m bump

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Dust emission by AGN and starbursts


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    Presentation Transcript
    1. -Starbursts (SB): Dust models and SED -Observations: MIR spectra of SB viz. AGN -Physics: Dust and X-rays -Radiative transfer: 3 parameter models? -AGN unification: The 10μm bump SED = starburst + AGN ? Dust emission by AGN and starbursts

    2. Dust models: small + large grains

    3. SED models of starbursts Starformation history:  scaling with M82, …  optically thin templates  physical models

    4. Large (24”) viz small ( 1”) beam

    5. Large (24”) viz small ( 1”) beam

    6. Dust absorption propertiesfrom cm to 30keV Limits of Mie theory:Voit 1991; Dwek & Smith 1996 Photo e- for hv > 100eV κabsκem

    7. Photo-destruction by soft X-rays Voit 91; Siebenmorgen et al.04

    8. SB : stars distributed in the disk AGN : point source  - within 30keV – 2mm 3parameters: AV=25mag ; L = 1011Lo ; R = 1kpc AGN viz starburst

    9. AGN radiative transfer models:3 Parameter models: Lum, Rdisk, Av

    10. Composite SED of 75 3CR sources

    11. AGN unification viz. 10mm silicate emission feature Proposed solutions: - Very large silicates (a>10μm) (Laor&Draine 93) - Reduced silicate abundance “ - Tapered torus geometry (ERR 95) - Clumpines (Nenkova et al.2002)

    12. Torus viz 10μm silicate band Efstathiou et al. 1991, 1995

    13. Clumpy torus 1D: Nenkova et al. 2002 2D: Dullemond&van Bemmel 2005 3D: Siebenmorgen&Krügel

    14. Discovery of 10mm silicate emission band in quasars Spitzer IRS

    15. Starburst + AGN