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Astronomy Tea Talks at Caltech

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

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2011 - 2012 season:
12 December 2011 Caitlin Casey (IfA)

Taking Census of Extreme Hearschel-bright Starbursts at High-z

I present results from a large Keck spectroscopic survey of 0400) of high-z ULIRGs with spectroscopic redshifts since the work on ~<100 SMGs, selected at 850um from SCUBA. I present stacked rest-frame ultraviolet and optical spectra for these Herschel-bright galaxies ("HBGs"), and perform FIR SED fitting to infer FIR luminosities, dust temperatures, emissivities and measure the FIR/radio correlation as a function of redshift. Selected in FIR bands near the peak of blackbody emission (rather than on the Rayleigh Jeans tail, where 850um selection lies), HBGs do not suffer from the same strong dust temperature selection biases as SMGs. As a result, we infer that there are roughly twice as many high-z extreme starbursts than previously thought from submm surveys, which has implications for the enhanced role of extreme starbursts in the star formation history of the Universe.
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Last modified on 09th Dec 2011 by Marco Viero.  

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