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Title:
Arp 102B: An ADAF and a Torus?
Authors:
Chary, R.-R.
Publication:
The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October, 2006 at Xi'an Jioatong University, Xi'an, China. Edited by Luis C. Ho and Jian-Min Wang, p.443
Publication Date:
10/2007
Origin:
ASP
Bibliographic Code:
2007ASPC..373..443C

Abstract

Arp 102B is a nearby radio galaxy which displays the presence of double-peaked Balmer emission lines. Sub-arcsec Keck mid-infrared imaging and Spitzer spectroscopy reveal a spatially compact mid-infrared source which displays tentative evidence for variability. The Fν∝ν-1.2 spectral energy distribution is suggestive of an advection-dominated accretion flow. The absence of dust features over the 5-40 μm range make it unlikely that thermal dust emission dominates the mid-infrared luminosity. We also detect the presence of molecular hydrogen in emission which is asymmetrically redshifted by ˜500-1000 km/s from the systemic velocity of the galaxy. Since the forbidden, low-ionization lines in this galaxy are at the systemic velocity, we suggest that the molecular hydrogen emission arises from a rotating molecular gas structure surrounding the nuclear black hole at a distance of ˜1 pc.
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