The Megamaser Cosmology Project. VI. Observations of NGC 6323

Abstract

We present observations of the H2O megamasers in the accretion disk of NGC 6323. By combining interferometric and spectral monitoring data, we estimate H${}_0=73_{-22}^{+26}$ km/s/Mpc, where the low strength of the systemic masers (<15 mJy) limits the accuracy of this estimate. The methods developed here for dealing with weak maser emission provide guidance for observations of similar sources, until significant increases in radio telescope sensitivity, such as anticipated from the next generation Very Large Array, are realized.

arXiv comment17 pages, 7 figures, 4 tables; Accepted by ApJ; in press

References in corpus (7)

• Fast and reliable MCMC for cosmological parameter estimation
• The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks
• The Megamaser Cosmology Project: IV. A Direct Measurement of the Hubble Constant from UGC 3789
• The Megamaser Cosmology Project: I. VLBI observations of UGC 3789
• Toward a New Distance to the Active Galaxy NGC 4258: II. Centripetal Accelerations and Investigation of Spiral Structure
• The Megamaser Cosmology Project. V. An Angular Diameter Distance to NGC 6264 at 140 Mpc
• The Megamaser Cosmology Project. II. The Angular-Diameter Distance to UGC 3789

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