Survey of Paschen Alpha in High Redshift Galaxies

Details Survey of Paschen Alpha in High Redshift Galaxies Survey of Paschen Alpha in High Redshift Galaxies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40443p&link_type=abstract

Spitzer Proposal ID #40443

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Scientific paper

All studies of high redshift galaxies rely on the star formation rates (SFRs) based on local calibrations, normally made against neutral hydrogen recombination lines. Of these lines, Paschen-alpha suffers the least from dust extinction, and is a direct tracer of the ionizing radiation from young stars. No test of SFR indicators against Paschen-alpha at high redshift has been attempted. Although for z > 2 Paschen-alpha is accessible to Spitzer/IRS, star-forming galaxies at these redshifts are too faint intrinsically. Here, we propose to measure Paschen-alpha in six gravitationally lensed, star-forming galaxies at 2 < z < 3. These galaxies are magnified by factors of 4-30, making it possible to measure the Paschen-alpha line in typical star-forming galaxies at these redshifts directly with Spitzer. We also request joint near-IR spectroscopy with the Gemini telescopes to measure H-alpha (and H-beta when possible) in order to correct the attenuation in Paschen alpha. We will then compare the Paschen alpha line luminosity against other tracers of the SFR commonly used at high redshifts: e.g., the UV luminosity; the rest-frame mid-IR emission features and luminosity; and the far-IR luminosity. Our galaxy sample spans the complete range of star-forming galaxy type at 2 < z < 3, and therefore these measurements will provide our best SFR comparison yet obtained at high redshift.

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