Image of Alice in Wonderland at the Mad Hatter's tea party You are cordially invited to afternoon tea and biscuits wine and chocolate

Astronomy Tea Talks at Caltech

Mondays, Hameetman auditorium (Cahill)
Tea:  4.00pm
Talk: 4.15pm

Organized by:

2010 - 2011 season:
4 April 2011 Mike Kuhlen

'Solving the dwarf galaxy problem with H2-regulated star formation'

The dearth of bright Local Group satellite galaxies and the faint end of the field galaxy luminosity function imply strongly reduced star formation efficiencies in low mass dark matter halos. Photoheating by the meta-galactic UV background and energy or momentum injection from massive stars and supernovae are commonly invoked to explain this reduction. Recently another possibility has been suggested: star formation in low mass halos might be less efficient because of a reduced molecular hydrogen abundance. I will present initial results from cosmological hydrodynamics simulations in which star formation is regulated by the molecular hydrogen abundance, and show that indeed this leads to a suppression of star formation in halos with masses less than 10^10 Msun. This effect may be an important contribution to explaining the dwarf galaxy problem.
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Image of the Mad Hatter from Alice in Wonderland
Last modified on 20th Jul 2011 by Dominik A. Riechers.  

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