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:
31 January 2011 Katherine Kornei (UCLA)

'The Prevalence and Properties of Outflowing Winds at z = 1'

Outflowing winds have been observed in galaxies at a variety of redshifts and are thought to play an important role in both the quenching of star formation and the enrichment of the intergalactic medium. In this talk, I will present the results of a study at z = 1 tracing the prevalence and properties of outflows in a sample of DEEP2 objects with rest-frame UV spectroscopy and HST optical imaging. We investigate if a critical star formation rate surface density is required to drive outflows, using a new technique for estimating galaxy area based on a physically motivated luminosity threshold. Previous work has suggested that the star formation rate surface density may be most strongly correlated with outflows (as opposed to the star formation rate); our method of estimating the area over which star formation is occuring represents an improvement over the simple adoption of a Petrosian or half-light radius. We discuss fine structure FeII emission in light of galaxy properties and investigate the likely origin of these features (which are not commonly observed in local starbursts). By conducting analyses on a per-object basis at z = 1, we are able to examine the relationship between outflow properties and individual galaxy morphology, stellar populations, and star formation surface density, at the epoch when the global star formation rate is beginning its decline to the present day.
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Last modified on 20th Jul 2011 by Dominik A. Riechers.  

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