Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732802j&link_type=abstract
American Astronomical Society, AAS Meeting #217, #328.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The several hundred galaxies that make up the Local Volume (within 10 Mpc) can be resolved into stars with the Hubble Space Telescope (HST). To date 300 of these galaxies have been observed with HST, including a nearly complete volume-limited sample of 150 galaxies within 4.5 Mpc. We announce the availability of a database of photometry from these observations, from which we measure distances to each galaxy based on the Tip of the Red Giant Branch (TRGB) method. Combining the TRGB distances with radial velocity information allows us to identify new members of groups and to measure group masses. Furthermore, these data can be used in the reconstruction of galaxy orbits using a numerical least-action method. Additionally, the HST photometry is well-suited to analyses of galaxy star formation histories via the color-magnitude diagram synthesis technique. This dataset, therefore, holds clues to the nature of dark matter, Large Scale Structure, and galaxy evolution. We present early results from each of these types of studies. This work is supported through HST program: GO-11584.
Jacobs Bradley
Rizzi Luca
Shaya Edward J.
Tully Brent R.
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