Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924320b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #243.20
Astronomy and Astrophysics
Astronomy
Scientific paper
The Megamaser Cosmology Project (MCP) aims to determine the Hubble constant by measuring geometric distances to galaxies in the Hubble flow. Our measurements are based on observations of 22 GHz water vapor megamasers in the circumnuclear accretion disks of active galaxies. A second important goal of the project is to measure precise masses of the supermassive black holes in the galaxy nuclei. To reach these goals we must find new disk megamasers appropriate for distance and mass measurements. We use the Green Bank Telescope (GBT) to survey Seyfert 2 galaxies within z ≈ 0.04, as well as smaller samples of luminous, nearby galaxies, and AGN detected by Swift. We have discovered 58 masers so far, about 40% of the total number of galaxies detected in the water maser line. Several of the newly detected masers are strong candidates for follow-up VLBI imaging to determine distances and black hole masses. Here we present results of our maser surveys, including GBT spectra of all the masers discovered by the MCP.
Braatz James A.
Condon James J.
Impellizzeri Violetta
Megamaser Cosmology Project Team
Tilak Avanti
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