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Spectroscopy of Globular Clusters out to Large Radius in the Sombrero Galaxy
Terry Bridges, Katherine Rhode, Steve Zepf +1
We present new velocities for 62 globular clusters in M104 (NGC 4594, the Sombrero Galaxy), 56 from 2dF on the AAT and 6 from Hydra on WIYN. Combined with previous data, we have a…
The Resolved Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster
Patrick R. Durrell, Benjamin F. Williams, Robin Ciardullo +11
We report on the discovery of a faint (M_V ~ -10.6 +/- 0.2) dwarf spheroidal galaxy on deep F606W and F814W Hubble Space Telescope images of a Virgo intracluster field. The galaxy…
Star formation history and evolution of gas-rich dwarf galaxies in the Centaurus A group
M. Grossi, M. J. Disney, B. J . Pritzl +4
We analyse the properties of three unusual dwarf galaxies in the Centaurus A group discovered with the HIPASS survey. From their optical morphology they appear to be low surface br…
The RAVE Survey: Constraining the Local Galactic Escape Speed
M. C. Smith, G. R. Ruchti, A. Helmi +20
We report new constraints on the local escape speed of our Galaxy. Our analysis is based on a sample of high velocity stars from the RAVE survey and two previously published datase…
Galactic History: Formation and Evolution
Joss Bland-Hawthorn, Ken Freeman
We explore the motivation behind large stellar surveys in Galactic astronomy, in particular, surveys that measure the photometric, phase space and abundance properties of thousands…
The Metallicity Distribution of Intracluster Stars in Virgo
Benjamin F. Williams, Robin Ciardullo, Patrick R. Durrell +11
We have used the Hubble Space Telescope's Advanced Camera for Surveys (ACS) to detect and measure ~5300 stars in a single intracluster field in the Virgo Cluster. By performing F60…