A Caltech Library Service

Arp 102B: An ADAF and a Torus?

Chary, Ranga-Ram (2007) Arp 102B: An ADAF and a Torus? In: The central engine of active galactic nuclei. ASP Conference Series. No.373. Astronomical Society of the Pacific , San Francisco, pp. 443-446. ISBN 978-1-58381-307-2.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Chary, Ranga-Ram0000-0001-7583-0621
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.
Group:Infrared Processing and Analysis Center (IPAC)
Series Name:ASP Conference Series
Issue or Number:373
Record Number:CaltechAUTHORS:20100820-110343321
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19554
Deposited By: Tony Diaz
Deposited On:20 Aug 2010 20:00
Last Modified:03 Oct 2019 01:58

Repository Staff Only: item control page