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Continuum and spectral line observations of the OH Megamaser galaxy Arp 220

Rovilos, E. and Diamond, P. J. and Lonsdale, C. J. and Smith, H. E. (2003) Continuum and spectral line observations of the OH Megamaser galaxy Arp 220. Monthly Notices of the Royal Astronomical Society, 342 (2). pp. 373-382. ISSN 0035-8711. doi:10.1046/j.1365-8711.2003.06566.x.

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We present MERLIN observations of the continuum (both 1.6 and 5 GHz) and OH maser emission towards Arp 220. The correct spatial configuration of the various components of the galaxy is revealed. In the eastern component the masers are shown to be generally coincident with the larger-scale continuum emission; in the west, the masers and continuum do not generally arise from the same location. A velocity gradient [(0.32 ± 0.03) km s^(−1) pc^(−1)] is found in the eastern nuclear region on MERLIN scales; this gradient is three times smaller than that seen in H I and implies that the OH gas lies inside the H I. A re-analysis of previously presented global very long baseline interferometry data reveals a very high velocity gradient [(18.67 ± 0.12) km s^(−1) pc^(−1)] in one component, possibly the site of a heavily obscured active galactic nucleus.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Lonsdale, C. J.0000-0003-0898-406X
Additional Information:© 2003 RAS. Accepted 2003 February 20. Received 2003 February 20; in original form 2002 November 27. MERLIN is a national facility operated by the University of Manchester at Jodrell Bank Observatory on behalf of PPARC. ER would like to thank the Greek State Scholarships Foundation, without its financial support this work would not have been possible. We thank Al Stirling and Rob Beswick for useful discussions.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Greek State Scholarships FoundationUNSPECIFIED
Subject Keywords:masers, galaxies: active, galaxies: individual: Arp 220, radio continuum: galaxies, radio lines: galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20170408-214035386
Persistent URL:
Official Citation:E. Rovilos, P. J. Diamond, C. J. Lonsdale, C. J. Lonsdale, H. E. Smith; Continuum and spectral line observations of the OH Megamaser galaxy Arp 220, Monthly Notices of the Royal Astronomical Society, Volume 342, Issue 2, 21 June 2003, Pages 373–382,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76409
Deposited By: 1Science Import
Deposited On:02 Apr 2018 20:28
Last Modified:15 Nov 2021 16:59

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