NOAO >   Observing Info >   Approved Programs >   2016A-0329

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Program Information for 2016A-0329


PI: Samir Salim, Indiana U., salims@indiana.edu
Address: Department of Astronomy, 319 Swain West, Bloomington, IN, 47405 USA

CoI: Janice Lee, STScI

Title: Metallicity calibrations for high-redshift galaxies

Abstract: Near-IR spectroscopic surveys are now able to measure emission lines of a large number of galaxies at the peak of the cosmic epoch (z~2). However, when these line ratios are converted to metallicities, different line ratios yield discrepant results, which implies that the local metallicity calibrations are not valid at high redshift. This hinders our understanding of chemical enrichment evolution, a key aspect of galaxy evolution. Construction of metallicity calibrations requires direct-method metallicities from very weak emission lines, which cannot be observed at high redshift. We show that there exist galaxies in SDSS which share the ISM properties of their high-z counterparts. To construct the metallicity calibrations applicable for high-redshift populations we propose to measure direct metallicities of 30 such low-redshift analogs of high-z galaxies.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016A):  GEM-NQ/GMOSN -- 31hrs band 2 (GN-2016A-Q-45)


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NOAO >   Observing Info >   Approved Programs >   2016A-0329

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