OH megamasers, starburst and AGN activity in Markarian 231

Details OH megamasers, starburst and AGN activity in Markarian 231 OH megamasers, starburst and AGN activity in Markarian 231

2005-09-13

arxiv.org/abs/astro-ph/0509327v1

Mon.Not.Roy.Astron.Soc.364:353-366,2005

Astronomy and Astrophysics

Astrophysics

16 pages, 7 figures

Scientific paper

10.1111/j.1365-2966.2005.09588.x

We present MERLIN observations of OH maser and radio continuum emission from the Ultra Luminous IR Galaxy Markarian 231. The 1665- and 1667-MHz transitions have a combined velocity extent of 720 km/s and show a similar position-velocity structure including a gradient of 1.7 km/s/pc from NW to SE along the 420-pc major axis, steeper in the inner few tens of pc. The maser distribution is modelled as a torus rotating about an axis inclined at ~45deg. We estimate the enclosed mass density to be 320(90) Msun in a flattened distribution, including a central unresolved mass of /=1E+05 K, giving a maser gain of

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