NRAO/Socorro Colloquium Series

Michael Rich

UCLA


Adding the GALEX dimension to Galaxy Evolution


By adding GALEX UV photometry to SDSS optical photometry, it has become possible to construct the UV-optical color-magnitude diagram of galaxies, and separate the "blue cloud" into a well defined blue sequence of star forming galaxies. Early type galaxies with weak star formation have been found to occupy a "green valley", but it is still not clear whether these objects are dying star forming galaxies, or red galaxies that have experienced a gas rich minor merger. We consider this new landscape, and address extreme examples of UV-bright early-type galaxies with low levels of star formation. Future radio telescopes will be able to measure the gas contents of these interesting galaxies. We also consider how complex merger histories may affect the evolution of galaxies in the Local Group, including M31 and the Milky Way.






May 6, 2011
11:00 am

Array Operations Center Auditorium

All NRAO employees are invited to attend via video, available in Charlottesville Room 230, Green Bank Room 137 and Tucson N525.

Local Host: Joan Wrobel