The Megamaser Cosmology Project: Angular-Diameter Distances to Megamaser Galaxies and their Black Hole Masses

Details The Megamaser Cosmology Project: Angular-Diameter Distances to Megamaser Galaxies and their Black Hole Masses The Megamaser Cosmology Project: Angular-Diameter Distances to Megamaser Galaxies and their Black Hole Masses

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21740806k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #408.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

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The Megamaser Cosmology Project (MCP) aims to measure the Hubble constant (H0) to 3% accuracy in order to constrain the Dark Energy equation of state parameter, w. The key to achieving this goal is to measure distances accurately to galaxies well into the Hubble flow (50 - 200 Mpc). To measure accurate distances, we adopt the proven H2O megamaser method pioneered by the study of NGC 4258. An essential component of this technique involves sub-milliarcsecon Very Long Baseline Interferometry (VLBI) imaging of the sub-parsec H2O megamaser disks at the centers of active galaxies. We determine accurate angular-diameter distances to these galaxies with precise astrometry and kinematics of the maser clumps in the disks. For distance determination, we have concentrated mainly on six galaxies (UGC 3789, Mrk 1419, NGC 6264, NGC 6323, NGC 2273, and NGC 1194) that show the necessary maser spectral characteristics. In addition, we are pursuing VLBI imaging for several other galaxies for which a distance measurement would be difficult, but we can still measure masses of the black holes (BH) at their centers. In this talk, I will present our latest work on distance determination for NGC 6323 and NGC 6264, and our results on BH mass measurements for seven megamaser galaxies, along with
implications for the universality of the M-sigma relation.

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