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EVN and MERLIN observations of an OH maser ring and a starburst continuum in III Zw 35

Published online by Cambridge University Press:  03 August 2017

Ylva M. Pihlström ,
John E. Conway  and
Roy S. Booth
Ylva M. Pihlström
Affiliation:
Onsala Space Observatory, S-439 92 Onsala, Sweden
John E. Conway
Affiliation:
Onsala Space Observatory, S-439 92 Onsala, Sweden
Roy S. Booth
Affiliation:
Onsala Space Observatory, S-439 92 Onsala, Sweden

Abstract

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We report on high-sensitivity EVN and MERLIN observations of the OH maser emission and continuum in the luminous infrared galaxy III Zw 35. Earlier VLBI observations have shown two compact maser clumps containing 40%–50% of the single-dish flux. In addition to these compact masers, we detect more diffuse maser emission which lies in a clear ring structure of radius r ∼ 22 pc. The ring appears inclined to the line of sight and the compact masers occur at the tangent points. This structure suggests that the compact and diffuse masers appear different because of geometrical effects and not pumping or other physical conditions. Our observations reveal a velocity gradient along the western side of the disc which indicates rotation. The 18 cm continuum radiation is resolved into a few unresolved sources, plus more diffuse emission and is broadly consistent with emission originating in a starburst.

Type
Part 5. Extragalactic Nuclear Masers
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 426 - 429
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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