Mass across the Redshift Desert: Stellar Masses in a Large and Uniform Sample of Strongly-Lensed Galaxies at 1 < z < 3

Details Mass across the Redshift Desert: Stellar Masses in a Large and Uniform Sample of Strongly-Lensed Galaxies at 1 < z < 3 Mass across the Redshift Desert: Stellar Masses in a Large and Uniform Sample of Strongly-Lensed Galaxies at 1 < z < 3

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70154g&link_type=abstract

Spitzer Proposal ID #70154

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Scientific paper

We propose 3.6 and 4.5 micron imaging of a sample of 89 strongly-lensed high redshift (1 < z < 3) galaxies, selected uniformly from the SDSS. The magnification by galaxy cluster-scale lenses of this otherwise faint sample of galaxies offers both a statistical and an individualized look into the evolution of the mass-metallicity relation and the build-up of stellar mass at the peak of the star-formation history of the universe. The mid-IR imaging delivered by IRAC is critical to establishing the stellar mass measurements necessary for this program, and complements extensive and ongoing imaging and spectroscopic programs at optical and near IR wavelengths. We require modest (5-20 min) exposures at both 3.6 and 4.5 microns. Ultimately, the derived stellar masses will depend on a careful measurement of the source magnification, which itself requires an accurate lens model. The color baseline provided by IRAC will enable the identification of strongly-lensed image families that greatly improve this modeling. Finally, as these sources are all found behind cluster lenses, the total gravitational lensing cross-section inherent in this proposal is considerable. Combining the proposed imaging with extant optical data for these lenses offers an efficient opportunity to detect z > 6 dropout galaxies, particularly at bright limits where followup spectroscopy using current facilities should be possible.

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