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Monash Astro Seminars
3pm, Tuesday 28 July 2009; Physics meeting room
Glenn Kacprzak
"The Kinematics of Extended Gaseous Halos of Galaxies"
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We lack a thorough understanding, both observationally and theoretically, of how feedback from star formation, winds and inflows precisely affect the dynamics of galaxies and their extended halos. Here, we attempt to disentangle the rather complex coupling between these processes using both observations and simulations of extended gaseous galaxy halos. MgII absorption lines detected in the spectra of background quasars can be used to probe the kinematics and physical conditions in the halos of foreground galaxies. By comparing halo gas kinematics to the dynamics of the host galaxies themselves, a clear picture of the galaxy-halo relationship begins to emerge. We further compare the high quality absorption data and galaxy spectra with similarly-analyzed LCDM cosmological simulations. Together, they suggest a picture in which gaseous halos are chemically enriched by outflowing shock-heated supernovae winds while low metallicity gas inflowing along filaments produces an inhomogeneous temperature, velocity, and metallicity distributions with a non-unity gas covering fraction.
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Please email all enquiries to daniel.price@sci.monash.edu.au or rosemary.mardling@sci.monash.edu.au
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