Arp 102B: An ADAF and a Torus?
- Creators
-
Chary, Ranga-Ram
- Others:
- Ho, Luis C.
- Wang, Jian-Min
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.Attached Files
Published - Chary2007p8683Central_Engine_Of_Active_Galactic_Nuclei.pdf
Files
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Additional details
- Eprint ID
- 19554
- Resolver ID
- CaltechAUTHORS:20100820-110343321
- Created
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2010-08-20Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)
- Series Name
- ASP Conference Series
- Series Volume or Issue Number
- 373