The Treasure Chamber of the OH Megamaser Mrk 273

Details The Treasure Chamber of the OH Megamaser Mrk 273 The Treasure Chamber of the OH Megamaser Mrk 273

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..175k&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Line and continuum observations carried out by the EVN at 1.6 GHz show an emission structure in the central region of 1 square arcsec in the Megamaser galaxy Mrk 273. The detected hydroxyl emission reveals an unexpected view on the molecular environment, with emission up to a spatial extend of 240 mas towards only one nuclear source. The hydroxyl emission itself is partially superposed on the continuum emission and shows a moderately high main--line ratio, which suggests optically thin maser emission with a more complex pumping scheme. The line--of--sight velocities indicate the organized structure of an edge--on disk/TORUS with Keplerian rotation around a central object with a mass of 3.5 times 108Msun. The observed continuum emission displays three individual regions with self--absorbed synchrotron radio spectra. Combined with existing HI observations they may reveal a third nucleus toward the southeast taking part in a merging scenario.

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