The connection between the obscuring torus and masing disk in H_2O Megamasers

Details The connection between the obscuring torus and masing disk in H_2O Megamasers The connection between the obscuring torus and masing disk in H_2O Megamasers

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7278f&link_type=abstract

HST Proposal ID #7278

Physics

Hst Proposal Id #7278 Agn/Quasars

Scientific paper

Using narrow and broad-band filters we intend to investigate the connection between the molecular torus and the emission line gas in a complete sample of H_2O megamasers. The strong maser emission found in those galaxies is apparently due to amplification of seed photons in a molecular disk or torus surrounding an AGN which is seen edge on {e.g. as in NGC 4258}. If so, shadowing of the nuclear continuum emission by the same torus should lead to an elongated, bipolar emission line region along the rotation axis. In a just completed HST survey of Seyfert galaxies we detected such emission-line regions in a large fraction of galaxies, and this cone of ionized gas is the only direct tracer of the molecular torus at larger scales. In addition we propose to take continuum images to obtain color maps of the nuclei and identify nuclear dust-lanes, which could be linked to the nuclear tori. By comparing the orientations of ionized gas, molecular disk {as probed e.g. by VLBI}, nuclear dust lanes and galaxy disk, we hope to prove or disprove the idea that the H_2O megamaser- phenomenon is an orientation effect where the maser sources are co-planar with the obscuring torus and a large scale molecular accretion disk. The images will also help to detect new emission line jets as seen for example in NGC 4258. Moreover, using the continuum images, we want to distinguish between physical mechanisms like bars, mergers or large scale accretion disks that might have lead to the formation of the nuclear masing disk.

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