Following the gas flows from nuclear spirals to the accretion disk

Details Following the gas flows from nuclear spirals to the accretion disk Following the gas flows from nuclear spirals to the accretion disk

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..283s&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

2

Scientific paper

One of the possible processes by which gas from galactic scales reaches an active nucleus to feed the supermassive black hole inside is through streaming motions along nuclear gaseous spirals. I present an analysis of HST images of a sample of 50 nearby active galaxies as compared with a control sample of inactive galaxies which indeed shows a clear excess of nuclear dusty spirals in the active galaxies when compared with the control sample. In the case of the LINER/Seyfert 1 galaxy NGC1097, I show also kinematic evidence of streaming motions along a nuclear spiral down to 30 pc from the nucleus, obtained through H alpha Integral Field spectroscopy of the nuclear region using the Gemini South Telescope. I then use the accretion disk parameters derived from the fit of the nuclear X-ray and UV continuum as well as from the fit of the double-peaked Halpha profile to relate the accretion rate of the disk to the large scale streaming motions along the nuclear spiral. In this way, I derive constraints to the total mass rate reaching the accretion disk and on the geometry of the flow in the region between the innermost resolvable radius of the nuclear spiral (30 pc) and the outer radius of the accretion disk.

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