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The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
D. W. Pesce, J. A. Braatz, M. J. Reid +8
We present a measurement of the Hubble constant made using geometric distance measurements to megamaser-hosting galaxies. We have applied an improved approach for fitting maser dat…
Toward a New Geometric Distance to the Active Galaxy NGC 4258. III. Final Results and the Hubble Constant
Liz Humphreys, Mark Reid, Jim Moran +2
We report a new geometric maser distance estimate to the active galaxy NGC 4258. The data for the new model are maser line-of-sight velocities and sky positions from 18 epochs of V…
The Megamaser Cosmology Project: IV. A Direct Measurement of the Hubble Constant from UGC 3789
M. J. Reid, J. A. Braatz, J. J. Condon +4
In Papers I and II from the Megamaser Cosmology Project (MCP), we reported initial observations of water masers in an accretion disk of a supermassive black hole at the center of t…
The Megamaser Cosmology Project. V. An Angular Diameter Distance to NGC 6264 at 140 Mpc
Chengyu Kuo, James A. Braatz, Mark J. Reid +4
We present the direct measurement of the Hubble constant, yielding the direct measurement of the angular-diameter distance to NGC 6264 using the HO megamaser technique. Our m…
Cosmology and the Hubble Constant: On the Megamaser Cosmology Project (MCP)
C. Henkel, J. A. Braatz, M. J. Reid +4
The Hubble constant Ho describes not only the expansion of local space at redshift z ~ 0, but is also a fundamental parameter determining the evolution of the universe. Recent meas…
The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks
C. Y. Kuo, J. A. Braatz, J. J. Condon +7
Observations of HO masers from circumnuclear disks in active galaxies for the Megamaser Cosmology Project allow accurate measurement of the mass of supermassive black holes (BH…