Dipole-vortex structure of the obscuring tori in active galactic nuclei

Details Dipole-vortex structure of the obscuring tori in active galactic nuclei Dipole-vortex structure of the obscuring tori in active galactic nuclei

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..323b&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

Computer Science

Scientific paper

Starting with the Antonucci and Miller's work, tori have been considered as an AGN-structure necessary element forming the basis of the AGN unified scheme. The first direct observation of the obscuring dust tori in AGNs has been described recently by Jaffe and his colleagues (Jaffe et al. 2004). Tori were positively confirmed existing when observed with the VLT interferometer equipped by the mid-infrared interferometer instrument (MIDI), though the efforts to reveal their structure detail and internal motion are yet to come. Discussed in this report is the situation when the torus "twist" by radiation or wind transforms it into a dipole toroidal vortex which, in turn, can be a source of matter feeding the accretion disk. The accretion rate is regulated by the vortex. Thus originating instability can be responsible for quasar radiation flares accompanied by matter outbursts. The torus proves to be the cold (T = 300 K) and thick (Jaffe et al. 2004) that has found the natural explanation in the toroidal vortex model: the torus thickness is defined not by the temperature but the vortex velocity circulation. Due to dipole structure of the vortex the streamlines in the cross section resemble the "vortex pair", the forward movement of which is stopped by coronal wind from the central source. The observed two tori - more cold the outer and more warm the inner (Jaffe et al. 2004) - possibly reflect the "matrioshka" structure of the tori. This structure may be evolutionary: in the shadow of the nearest to the center tori the next are arisen. The torus mass dependence on the distance from the center regulates by the accretion rate from the toroidal vortex that is guaranteeing the Eddington luminosity of the source. W. Jaffe et al. Nature, v.429, P.702, 2004.

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