The Starburst Luminosity Function at High Redshift

Details The Starburst Luminosity Function at High Redshift The Starburst Luminosity Function at High Redshift

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40039h&link_type=abstract

Spitzer Proposal ID #40039

Physics

Scientific paper

Our previous IRS observations have shown that sources selected from the SWIRE survey based on the presence of redshifted photospheric continuum in the IRAC bands always show strong PAH emission features in the IRS spectra, and with a narrow dispersion between 1.6u continuum and 7.7u PAH rest frame flux density. This suggests a link between these two parts of the spectrum which may allow us to derive star formation rates for large samples of these high-redshift, starburst-dominated ULIRGs using the IRAC fluxes. A selection effect favors z ~ 2 because the PAH emission at 7.7u enhances the MIPS 24u flux at such redshifts. To understand the selection effects and to calibrate better the PAH vs. IRAC fluxes, new observations are proposed for 15 SWIRE sources with photometric z ~ 2 but at the extreme of the fv(24u)/fv(5.8u) ratio, having minimal values of this ratio. This will determine if such sources have weak MIPS 24u flux because the PAH features are truly weak, or because they are at redshifts which remove this feature from the MIPS band.

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