Investigation of the obscuring circumnuclear torus in the active galaxy Mrk231

Details Investigation of the obscuring circumnuclear torus in the active galaxy Mrk231 Investigation of the obscuring circumnuclear torus in the active galaxy Mrk231

2003-02-19

arxiv.org/abs/astro-ph/0302395v1

Astronomy and Astrophysics

Astrophysics

10 pages, including 3 Figures, published in Nature Vol 421 2003; the published pdf--file and higher quality images are availab

Scientific paper

Here we report on observations of powerful hydroxyl (OH) line emissions that trace the obscuring material within the circumnuclear environment of the galaxy Markarian 231. The hydroxyl (mega)-maser emission shows the characteristics of a rotating, dusty, molecular torus (or thick disk) located between 30 and 100 pc from the central engine. We now have a clear view of the physical conditions, the kinematics and the spatial structure of this material on intermediate size scales, confirming the main tenets of unification models.

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