GBT Monitoring and Surveys for H2O Maser Emission in AGNS

Details GBT Monitoring and Surveys for H2O Maser Emission in AGNS GBT Monitoring and Surveys for H2O Maser Emission in AGNS

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mas..conf..227b&link_type=abstract

MULTIWAVELENGTH AGN SURVEYS. Proceedings of the Guillermo Haro Conference 2003. Held 8-12 December 2003 in Cozumel, Mexico. Edit

Astronomy and Astrophysics

Astronomy

Scientific paper

We are using the Green Bank Telescope (GBT) to study the nuclear gas in active galaxies through observations of the 22 GHz water maser line. We have been monitoring multiple sources over 1.7 years and have confirmed and refined previous measurements of velocity drifts in both IC 25601 and Mrk 14192. In NGC 1386 the velocity drifts in all maser components are small, < 0.5 km s-1 yr-1. We are also revisiting surveys for water maser systems in nearby (v < 12000 km/s) type 2 AGNs. Several new sources have been discovered, including masers in the nuclei of NGC 6323, NGC 5728, and NGC 4388. Each of these has maser components at large velocity offsets (up to 550 km/s) from the systemic velocity, suggesting the presence of a nuclear disk. In NGC 6323 and NGC 4388, maser components are detected near the systemic velocity as well. Our results confirm that water vapor emission in AGNs is more common than previously shown.

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