Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714257i&link_type=abstract
American Astronomical Society, AAS Meeting #217, #142.57; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The goal of the Megamaser Cosmology Project (MCP) is to determine a precise value of the Hubble Constant by measuring angular diameter distances to galaxies in the Hubble flow using the megamaser technique. We search for new megamasers and monitor the most promising ones with the Green Bank Telescope. The best candidates are then followed up with high-resolution VLBI observations to map the maser distribution. These observations provide direct geometrical distances to the galaxies, precise black-hole masses, and offer the opportunity to study their physical properties on sub-parsec scales. We present here an atlas of all VLBI maps of megamaser galaxies observed to date by the MCP. The maser distribution in these galaxies is consistent with emission from edge-on accretion disks in the AGN. The variety of properties gives insight into the different physical conditions associated with accretion onto a black hole, and we discuss those implications here.
Braatz James
Condon James J.
Henkel Carsten
Impellizzeri Caterina
Kuo Chaincy
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