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Imaging of the Arp 220 OH Megamasers with VLBI

Published online by Cambridge University Press:  12 April 2016

Colin J. Lonsdale ,
P. J. Diamond ,
Carol J. Lonsdale  and
H. E. Smith
Colin J. Lonsdale
Affiliation:
MIT Haystack Observatory, Westford MA 01886, U.S.A.
P. J. Diamond
Affiliation:
National Radio Astronomy Observatory, Socorro NM 87801, U.S.A.
Carol J. Lonsdale
Affiliation:
Infrared Processing and Analysis Center, Pasadena CA 91125, U.S.A.
H. E. Smith
Affiliation:
University of California San Diego, San Diego CA 92093, U.S.A. Infrared Processing and Analysis Center, Pasadena CA 91125, U.S.A.

Abstract

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Global VLBI imaging of the luminous IR galaxy Arp 220 reveals four major emission regions in the 1667 MHz line, each with complex spatial and velocity structure showing intriguing symmetries, suggestive of an AGN-related phenomenon. The continuum emission consists of about a dozen sub-mJy unresolved features which appear unrelated to the maser emission, and are interpreted as radio supernovae in an ongoing nuclear starburst.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 227 - 228
Copyright
Copyright © Astronomical Society of the Pacific 1998