Multiwavelength radio observations of the compact starburst in Arp 220
Abstract
We report the first detection at multiple radio wavelengths (13, 6, and 3.6 cm) of 18 compact sources within both nuclei of the Ultra Luminous Infra-Red Galaxy (ULIRG) Arp 220. In just over half of the sources we find that the observed spectra are consistent with the standard model of powerful Type IIn supernovae interacting with their pre-explosion stellar wind. The rate of appearance of new radio sources ascribed to these supernova events suggests that a large fraction of core-collapse supernovae in Arp 220 are highly luminous, possibly implying a radically different stellar initial mass function (IMF) or stellar evolution compared to galactic disks. A second group of sources, consisting of the brightest and longest monitored sources at 18 cm, do not easily fit the radio supernova model. We propose that these are young supernova remnants that have just begun interacting with their surrounding dense ISM.
Additional Information
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. Published on: 2007 November 22. RP acknowledges a Chalmers University PhD student stipend and JC a Swedish VR grant. This work was partially supported by NSF grant AST-0352953 to Haystack Observatory. The European VLBI Network is a joint facility of European, Chinese, South African and other radio astronomy institutes funded by their national research councils. The Arecibo Observatory is the principal facility of the National Astronomy and Ionosphere Center, which is operated by the Cornell University under a cooperative agreement with the National Science Foundation.Attached Files
Published - 8thEVN_033.pdf
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Additional details
- Eprint ID
- 89128
- Resolver ID
- CaltechAUTHORS:20180824-090128418
- Chalmers University
- Vetenskapsrådet
- AST-0352953
- NSF
- Created
-
2018-08-24Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)
- Series Name
- Proceedings of Science