Star Formation Rates and Metallities at z=1

Details Star Formation Rates and Metallities at z=1 Star Formation Rates and Metallities at z=1

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50586r&link_type=abstract

Spitzer Proposal ID #50586

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Scientific paper

We have two goals in this proposal. Deep 24 micron Spitzer surveys are widely used to study the evolution of star formation rate (SFR) with redshift. Such studies depend critically on the conversion from observed mid-IR flux density to total IR luminosity, and then to SFR. Our first goal is to test this conversion at z~1 on galaxies similar in luminosity to those that dominate the faint source counts. Our test is centered on measuring Brackett alpha line strengths in three z=1 galaxies whose fluxes have been strongly amplified by gravitational lensing. We have or will be obtaining 70 micron measurements of these same galaxies to constrain their far infrared spectral energy distributions. We will combine our sample with three unlensed, more luminous z=1 galaxies from a companion GTO proposal (50323). The two samples will test critically the IR to SFR conversions. Our second goal is to measure the metallicities for these three lensed galaxies. We already have measurements of the [Ne II] and [Ne III] lines in our LL1 spectra. By combining these results with the Br alpha and with measurements of Pa alpha, [Ne II], and [Ne III] in local LIRGs (from another of our GTO programs), we will determine the neon abundances. Neon should track the overall metallicities closely because it is synthesized in massive stars and does not deplete onto grains.

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