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OH emission and absorption associated with supernovae in Arp 220

Lonsdale, Colin J. and de Kleer, Katherine R. and Diamond, Philip J. and Thrall, Hannah and Lonsdale, Carol J. and Smith, Harding E. (2007) OH emission and absorption associated with supernovae in Arp 220. In: Astrophysical Masers and their Environments. IAU Symposium Proceedings Series. No.242. Cambridge University Press , Cambridge, pp. 432-436. ISBN 9780521874649. https://resolver.caltech.edu/CaltechAUTHORS:20190424-141802700

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Abstract

We present parsec-resolution spectral-line VLBI data for two epochs separated by 15 months as a precise new probe of the innermost regions of the nearby Ultraluminous Infrared Galaxy (ULIRG) Arp 220. This galaxy hosts a powerful starburst, with an associated supernova (SN) rate of order 4/yr. An extensive population of compact continuum sources interpreted as radio supernovae (RSNe) and young supernova remnants (SNR) has been imaged. We show here that many of the supernova-related radio continuum point sources exhibit clear evidence of OH absorption or maser emission in the intervening gas, and as such provide us with a sampling of conditions along very narrow and specific lines of sight through the nuclear environment. The OH gas along these lines of sight exhibits velocity dispersions of up to several tens of km/sec, and that in some cases, multiple distinct concentrations of masing gas at different radial velocities can be discerned. There is evidence for variability in the OH properties on ~1yr timescales. Our results are discussed in the context of the overall OH megamaser properties of Arp 220.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1017/s1743921307013555DOIArticle
ORCID:
AuthorORCID
Lonsdale, Colin J.0000-0003-4062-4654
de Kleer, Katherine R.0000-0002-9068-3428
Lonsdale, Carol J.0000-0003-0898-406X
Additional Information:© International Astronomical Union 2008. CJL acknowledges support from NSF grant AST-0352953 to the MIT Haystack Observatory. KdK acknowledges support through the REU program at Haystack Observatory, NSF grant AST-0138508.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NSFAST-0352953
NSFAST-0138508
Subject Keywords:galaxies: active — infrared: galaxies — radio lines: galaxies — masers
Series Name:IAU Symposium Proceedings Series
Issue or Number:242
DOI:10.1017/s1743921307013555
Record Number:CaltechAUTHORS:20190424-141802700
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190424-141802700
Official Citation:Lonsdale, C., De Kleer, K., Diamond, P., Thrall, H., Lonsdale, C., & Smith, H. (2007). OH emission and absorption associated with supernovae in Arp 220. Proceedings of the International Astronomical Union, 3(S242), 432-436. doi:10.1017/S1743921307013555
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94938
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 Apr 2019 22:18
Last Modified:16 Nov 2021 17:09

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