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H2O MegaMasers: RadioAstron success story

Published online by Cambridge University Press:  16 July 2018

Willem Baan ,
Alexey Alakoz ,
Tao An ,
Simon Ellingsen ,
Christian Henkel ,
Hiroshi Imai ,
Vladimir Kostenko ,
Ivan Litovchenko ,
James Moran  and
Andrej Sobolev
...Show all authors
Willem Baan
Affiliation:
Netherlands Institute for Radio Astronomy, Dwingeloo, The Netherlands, email: baan@astron.nl XinJiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, PR China
Alexey Alakoz
Affiliation:
AstroSpace Center, Lebedev Physical Institute, Moscow, Russia, email: alexey.alakoz@gmail.com
Tao An
Affiliation:
Shanghai Astrophysical Observatory, Chinese Academy of Sciences, Shanghai, PR China
Simon Ellingsen
Affiliation:
University of Tasmania, Hobart, Australia
Christian Henkel
Affiliation:
Max Planck Institut für Radioastronomie, Bonn, Germany Astron. Dept., King Abdulaziz Univ., Jeddah, Saudi Arabia
Hiroshi Imai
Affiliation:
Kagoshima University, Kagoshima, Japan
Vladimir Kostenko
Affiliation:
AstroSpace Center, Lebedev Physical Institute, Moscow, Russia, email: alexey.alakoz@gmail.com
Ivan Litovchenko
Affiliation:
AstroSpace Center, Lebedev Physical Institute, Moscow, Russia, email: alexey.alakoz@gmail.com
James Moran
Affiliation:
Center for Astrophysics, Cambridge MA, USA
Andrej Sobolev
Affiliation:
Ural Federal University, Ekaterinburg, Russia
Alexander Tolmachev
Affiliation:
AstroSpace Center, Lebedev Physical Institute, Moscow, Russia, email: alexey.alakoz@gmail.com
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Abstract

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The RadioAstron space-VLBI mission has successfully detected extragalactic H2O MegaMaser emission regions at very long Earth to space baselines ranging between 1.4 and 26.7 Earth Diameters (ED). The preliminary results for two galaxies, NGC 3079 and NGC 4258, at baselines longer than one ED indicate masering environments and excitation conditions in these galaxies that are distinctly different. Further observations of NGC 4258 at even longer baselines are expected to reveal more of the physics of individual emission regions.

Keywords

galaxies: nucleigalaxies: ISMmasersradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 422 - 425
Copyright
Copyright © International Astronomical Union 2018 

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