Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12185g&link_type=abstract
HST Proposal ID #12185. Cycle 18
Computer Science
Scientific paper
We propose to obtain multi-wavelength imaging of a new sample of exquisite megamaser disk galaxies. Much like in NGC 4258, the megamasers in our sample trace sub-pc, circumnuclear gas in Keplerian rotation around the central supermassive black holes {BHs}. We are thus able to derive remarkably precise BH masses in these systems. As the megamasers are found in spiral galaxies with BH masses 10^7 M_sun, they offer a unique opportunity to study BH-bulge scaling relations in later-type galaxies. Existing ground-based imaging is inadequate to disentangle the many structural components {star clusters, bars, spirals, and dust lanes} found in the nuclei of these galaxies. Thus, we propose F336W, F438W, F814W, F110W, and F160W observations of these galaxies with WFC3 to simultaneously model the stellar populations and structures of their inner regions. With these data we will constrain BH-bulge scaling relations at low mass, study the relation between nuclear star clusters and supermassive BHs, and look for evidence of coincident star formation and accretion. The mass-to-light ratio profiles will provide important inputs to complementary stellar- and gas-dynamical modeling of the BH masses. The high-precision masses afforded by this sample of new megamaser galaxies provides a tremendous resource for our community that can only be adequately exploited with complementary HST imaging.;
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