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:

2009 - 2010 season:
8 February 2010 Roderik Overzier (MPA)

'Extreme Starburst Galaxies at Low and High Redshift'

Starburst galaxies are important for our understanding of galaxy evolution
at all redshifts. I will present and discuss the latest results from our
ongoing survey of "Local Analogs of Lyman Break Galaxies", a sample of
extreme starburst galaxies in the nearby universe. Because the local
starbursts are similar to typical UV-selected starbursts at high redshift
in most physical properties, we now have an excellent training set for
understanding the relation between massive star formation, ISM, host
galaxy structures, and nuclei of starbursts. The LBG analogs at low
redshift and LBGs at high redshift display a range in structures from
compact to clumpy that is different from typical local star-forming
galaxies. Recent studies have suggested that, at least at high redshift,
intense star formation is triggered by massive gas accretion in the form
of cold flows. Based on a detailed comparison with the morphologies of
LBGs at z=2-4 in ACS and WFC3 images of the Hubble Ultra Deep Field, we
conclude, however, that starbursts triggered by mergers remain a viable
mechanism for driving the evolution of these starbursts. Some of the local
analogs have very peculiar nuclei that are consistent with being the
progenitors of the central cusps in local ellipticals being formed in
dissipative mergers. These highly massive and dense nuclei provide an
ideal environment for the formation of supermassive black holes.

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Last modified on 20th Jul 2011 by Dominik A. Riechers.  

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