The Megamaser Cosmology Project. XI. A geometric distance to CGCG 074-064

Abstract

As part of the survey component of the Megamaser Cosmology Project, we have discovered a disk megamaser system in the galaxy CGCG 074-064. Using the GBT and the VLA, we have obtained spectral monitoring observations of this maser system at a monthly cadence over the course of two years. We find that the systemic maser features display line-of-sight accelerations of ~4.4 km s${}^{-1}$ yr${}^{-1}$ that are nearly constant with velocity, while the high-velocity maser features show accelerations that are consistent with zero. We have also used the HSA to make a high-sensitivity VLBI map of the maser system in CGCG 074-064, which reveals that the masers reside in a thin, edge-on disk with a diameter of ~1.5 mas (0.6 pc). Fitting a three-dimensional warped disk model to the data, we measure a black hole mass of $2.42_{-0.20}^{+0.22}\times 10^7$ M${}_{\odot }$ and a geometric distance to the system of $87.6_{-7.2}^{+7.9}$ Mpc. Assuming a CMB-frame recession velocity of $7308\pm 150$ km s${}^{-1}$, we constrain the Hubble constant to $H_0=81.0_{-6.9}^{+7.4}$ (stat.) $\pm 1.4$ (sys.) km s${}^{-1}$ Mpc${}^{-1}$.

22 pages, 6 figures, accepted for publication in ApJ

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