The Dependence of Galaxy Feedback on Stellar Populations at z~2-3

Details The Dependence of Galaxy Feedback on Stellar Populations at z~2-3 The Dependence of Galaxy Feedback on Stellar Populations at z~2-3

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70108r&link_type=abstract

Spitzer Proposal ID #70108

Computer Science

Scientific paper

We propose Spitzer IRAC 3.6 micron observations in fields where we have been conducting a large spectroscopic survey of galaxies, AGN, and QSOs in the same cosmic volumes at z~2-3. The IRAC data will be used to probe the stellar populations in these galaxies and to understand how galaxy properties (e.g., stellar masses, ages, star formation rates) depend on the flow of baryons into and out of galaxies. The dense spectroscopic sampling of the targeted fields have provided unique insights into the metal enrichment as a function of galactocentric radius and the statistical correlation between galaxies and metals in the inter-galactic medium. Our goal is to quantify how the distribution of metals in the circum-galactic and inter-galactic media (CGM/IGM) depend on the stellar masses, ages, and star formation rates of galaxies. An economical investment of just 40.4 hours (including overhead), divided among nine proposed pointings with IRAC, will cover a total of 900 spectroscopically-confirmed z~2-3 galaxies that span two orders of magnitude in bolometric luminosity and stellar mass. Future MOSFIRE multi-object near-IR spectroscopy will be used to compare galaxy chemistry with that of the nearby CGM/IGM with an even denser spectroscopic sampling of the same survey fields, thus adding greatly to the legacy value of the requested IRAC observations.

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