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Journal Article

The Megamaser Cosmology Project - XII. VLBI imaging of H2O maser emission in three active galaxies and the effect of AGN winds on disc dynamics

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Gao,  F.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Kuo, C. Y., Braatz, J. A., Impellizzeri, C. M. V., Gao, F., Pesce, D., Reid, M. J., et al. (2020). The Megamaser Cosmology Project - XII. VLBI imaging of H2O maser emission in three active galaxies and the effect of AGN winds on disc dynamics. Monthly Notices of the Royal Astronomical Society, 498(2), 1609-1627. doi:10.1093/mnras/staa2260.


Cite as: https://hdl.handle.net/21.11116/0000-0007-EFBE-7
Abstract
We present very long baseline interferometry (VLBI) images and kinematics of water maser emission in three active galaxies: NGC 5728, Mrk 1, and IRAS 08452–0011. IRAS 08452–0011, at a distance of ∼200 Mpc, is a triple-peaked H2O megamaser, consistent with a Keplerian rotating disc, indicating a black hole mass of (3.3±0.2)×107M⊙⁠. NGC 5728 and Mrk 1 display double-peaked spectra, and VLBI imaging reveals complicated gas kinematics that do not allow for a robust determination of black hole mass. We show evidence that the masers in NGC 5728 are in a wind while the Mrk 1 maser system has both disc and outflow components. We also find that disturbed morphology and kinematics are a ubiquitous feature of all double-peaked maser systems, implying that these maser sources may reside in environments where active galactic nucleus (AGN) winds are prominent at ∼1 pc scale and have significant impact on the masing gas. Such AGNs tend to have black hole masses MBH < 8 × 106 M⊙ and Eddington ratios λEdd ≳ 0.1, while the triple-peaked megamasers show an opposite trend.