21 December 2009
Kate Rubin (UCSC/Lick)
'The Kinematics and Geometry of Galactic Winds at z~1'
Galactic outflows are invoked as the mechanism responsible for the
buildup of the red sequence and the global decline in star formation
rate between z~1 and today. Measurements of outflow properties in
distant galaxies, such as the mass and energy outflow rates, are
central to understanding their role in the feedback processes which
drive this evolution. However, accurate determinations of these
outflow rates require knowledge of both the kinematics and the
spatial distribution of the outflow. I will discuss three
complementary approaches to investigating galactic winds at z~1.
Using absorption line signatures of outflows probed along the line
of sight to the host galaxy and toward distant background light
sources, we identify strong winds in a large sample of high star
formation rate galaxies, and trace the ejected interstellar medium
from a single post-starburst galaxy at z~0.5. Using emission line
signatures of outflows, we provide a unique view of the geometry
and spatial extent of outflowing gas in a starburst galaxy at z~0.7.