Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331301s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #313.01; Bulletin of the American Astronomical Society, Vol. 41, p.290
Other
Scientific paper
The star formation rates (SFRs) of Lyman Break Galaxies (LBGs) are typically estimated based on their UV properties or mid-IR photometry using local relations that are assumed to be true at high redshift (eg. reddening laws, IR SEDs). Recently, several lensed LBGs have been discovered with large magnifications allowing detailed infrared studies of this otherwise unobservable population. I'll present the Spitzer mid-IR spectra and mid- to far-IR photometry of two lensed LBGs, cB58 and the "Cosmic Eye." With these data we can test whether or not these locally determined relations are valid for high redshift starbursts. The PAHs and far-IR SEDs are similar in shape to local starbursts and have similar PAH-to-IR luminosity ratios. However, in both LBGs, the infrared luminosity is larger than what is expected given the UV luminosity and spectral slope. I'll discuss possible explanations for these discrepancies, and implications for determinations of the star formation rate history of the universe.
Chary Ranga Ram
Colbert James W.
Ellis Richard S.
Frayer Dave T.
Richard Jacques
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