your ID: 0176 
First Name: Ranga-Ram 
Last Name: Chary 
Affiliation: Spitzer Science Center 
Title: Mid-infrared Spectroscopy of Arp102B: An ADAF and a Torus ? 
Authors: R. Chary 
Topic: 1 
Session: oral 
Abstract: We present sub arcsec Keck mid-infrared imaging and 5-40 
micron Spitzer spectroscopy of the active galactic nucleus in Arp102B. 
The nucleus of the galaxy is clearly detected as a spatially compact 
mid-infrared source. The 5 year timeline between the Keck and Spitzer 
data shows some evidence for variability as well as a change in the 
spectral energy distribution which might be indicative of a transition 
from a thin disk to an ADAF. We also detect molecular hydrogen 
emission that is offset from the systemic velocity of the galaxy by 
500-1000 km/s. Since the forbidden lines are at the systemic velocity, 
we suggest that the molecular hydrogen emission arises from a rotating 
molecular gas structure at a distance of 1 pc.