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High Spatial Resolution Imaging of Arp 220 from 3 to 25 Microns

Soifer, B. T. and Neugebauer, G. and Matthews, K. and Becklin, E. E. and Ressler, M. and Werner, M. W. and Weinberger, A. J. and Egami, E. (1999) High Spatial Resolution Imaging of Arp 220 from 3 to 25 Microns. Astrophysical Journal, 513 (1). pp. 207-214. ISSN 0004-637X. doi:10.1086/306855.

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Images of Arp 220 from 3.45 to 24.5 μm with 0farcs5 resolution are presented that clearly separate the nucleus into at least two components. The western component is about 3 times more luminous than the eastern component, but the silicate absorption in the fainter, eastern component is roughly 50% greater than the absorption in the western component. Each component is marginally resolved. The two components seen at 24.5 μm are identified with the two radio components. The western source most likely coincides with the high-extinction disk previously suggested to exist in Arp 220, while the eastern nucleus is identified with a faint, highly reddened source seen in HST 2.2 μm NICMOS images. The two nuclei together account for essentially all of the measured 24.5 μm flux density. Two models are presented, both of which fit the observations. In one the majority of the total luminosity is produced in an extended star formation region, and in the other most of the luminosity is produced in the compact but extincted regions associated with the two nuclei seen at 24.5 μm. In both pictures, substantial luminosity at 100 μm emerges from a component having a diameter of 2"-3" (~1 kpc).

Item Type:Article
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URLURL TypeDescription Paper
Weinberger, A. J.0000-0001-6654-7859
Additional Information:© 1999. The American Astronomical Society. Received 1998 July 27. Accepted 1998 October 6. B. T. S., G. N., and K. M. are supported by grants from NASA and NSF. We thank J. Aycock, R. Goodrich, R. Moskitis, and the entire Keck staff for their help establishing the visitor port and obtaining these observations, and R. Chary, A. Evans, D. Koerner, K. Sakamoto, D. Sanders, and N. Scoville for helpful discussions about Arp 220 and these observations. The W. M. Keck Observatory is operated as a scientific partnership between the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. It was made possible by the generous financial support of the W. M. Keck Foundation. This research has made use of the NASA/IPAC Extragalactic Database, which is operated by the Jet Propulsion Laboratory, Caltech, under contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:galaxies: individual (Arp 220) ; galaxies: nuclei; galaxies: structure; infrared: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20170215-110545810
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Official Citation:B. T. Soifer et al 1999 ApJ 513 207
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74321
Deposited By: Ruth Sustaita
Deposited On:15 Feb 2017 19:17
Last Modified:11 Nov 2021 05:26

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