OH Maser Disks and Outflows in ULIRGs: VLBA Observations of two IRAS Galaxies

Details OH Maser Disks and Outflows in ULIRGs: VLBA Observations of two IRAS Galaxies OH Maser Disks and Outflows in ULIRGs: VLBA Observations of two IRAS Galaxies

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314602p&link_type=abstract

American Astronomical Society Meeting 203, #146.02; Bulletin of the American Astronomical Society, Vol. 36, p.590

Astronomy and Astrophysics

Astronomy

Scientific paper

OH megamaser emission is known to be associated with the most central 100 parsecs of Ultra Luminous Infrared Galaxies (ULIRGs). The masers are probing dense concentrations of gas, which presumably have accumulated during the merger event forming the ULIRG. VLBI observations have previously demonstrated that OH megamasers often trace circumnuclear disks or tori. However, some of the most extreme OH maser linewidths may require additional interpretation such as galactic outflows. Here we present the results from VLBA observations of the 1667 MHz and 1665 MHz OH lines in the two OH megamaser galaxies IRAS12032+1707 and IRAS14070+0525. Both sources show evidence of disk structures in their OH velocity fields. In IRAS12032+1707, additional blueshifted emission is suggested to be due to outflow, or alternatively a secondary disk. We find that the very broad emission exceeding 1000 km/s in those two galaxies likely is a combination of disk rotation, outflow and blending between 1667 MHz and 1665 MHz emission.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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