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Published 2007 | Published
Book Section - Chapter Open

Arp 102B: An ADAF and a Torus?

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 F_v ∝ 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.

Additional Information

© 2007 Astronomical Society of the Pacific. I would like to acknowledge my collaborators, Luis Ho, Harlan Devore, Eric Becklin and Nick Scoville for their assistance with different aspects of the observations. I would also like to acknowledge the organizers for a very enjoyable and productive meeting. These observations were partly a component of the Spitzer Teacher's Education program.

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Created:
August 19, 2023
Modified:
January 12, 2024