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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2004

The origin of optical emission from super-Eddington accreting Active Galactic Nuclei: The case of Ton S 180

Résumé

Self-gravitating accretion discs have only been studied in a few nearby objects using maser spots at the parsec-scale. We find a new spectral window for observing the self-gravitating accretion disc in super-Eddington accreting Active Galactic Nuclei (AGNs). This window is determined by calculating the outermost radius (rsg) of a non self-gravitating disc and the corresponding emission wavelength (lambdasg) as a function of various disc parameters. We find that lambdasg reaches ˜4000 Å for alpha=0.1, when M&sun; ≳ 70 (MBH / 107 M&sun;)-1 LEdd/c2 (where &alpha,; M&sun;, MBH and LEdd are, respectively, the viscosity parameter, gas accretion rate onto the central black hole (BH), the BH mass and the Eddington luminosity). Moreover, lambdasg is as small as ˜ 1500 Å for alpha =0.001, which is the smallest alpha case in this study. Therefore, the window for observing the self-gravitating part of an AGN accretion disc is from ˜ 2 mum to lambdasg. Incidentally, rsg can be less than the photon trapping radius for M&sun; ≳ 103.3 LEdd/c2. Namely, a self-gravitating, optically-thick, advection-dominated accretion disc is expected to appear in the extremely high accretion rate regime.
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Dates et versions

hal-03732611 , version 1 (08-09-2022)

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Toshihiro Kawaguchi, Arnaud Pierens, Jean-Marc Huré. The origin of optical emission from super-Eddington accreting Active Galactic Nuclei: The case of Ton S 180. Astronomy and Astrophysics - A&A, 2004, 415, pp.47-54. ⟨10.1051/0004-6361:20034613⟩. ⟨hal-03732611⟩
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