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

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50372p&link_type=abstract

Spitzer Proposal ID #50372

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Scientific paper

All studies of high redshift galaxies rely on the star formation rates (SFRs) based on local calibrations, normally against neutral hydrogen recombination lines. Of these lines, Paschen-alpha suffers the least from dust extinction, is a direct tracer of the ionizing radiation from young stars. Yet no test of SFR indicators at high redshifts against Paschen-alpha has been attempted. Although for z > 2 Paschen-alpha is accessible to Spitzer/IRS, star-forming galaxies at these redshifts are too faint intrinsically. In Cycle 4, we started a program to measure Paschen-alpha in five gravitationally lensed, star-forming galaxies at 2 < z < 3. Here, we propose to extend this program, obtaining observations of six additional lensed galaxies. We also request joint near-IR spectroscopy and imaging with the Gemini telescopes to measure H-alpha (and H-beta when possible) and 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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