NOAO >   Observing Info >   Approved Programs >   2017B-0823

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Program Information for 2017B-0823


PI: Ben Rosenwasser, U. of Wisconsin, Madison, rosenwas@astro.wisc.edu
Address: Astronomy Department, 475 N Charter St., Madison, WI 53706 United States

CoI: Amy Barger, U. of Wisconsin, Madison
CoI: Lennox Cowie, Institute for Astronomy
CoI: Esther Hu, Institute for Astronomy
CoI: Logan Jones, U. of Wisconsin, Madison

Title: Towards Direct Metallicity Measurements at Intermediate Redshift

Abstract: We propose to observe ultra-strong emission-line galaxies at intermediate redshift, which contain a significant fraction of the star formation rate density in this redshift range. Targets will be selected from 40 deg$^2$ of g,r,i,z,y, and NB921 imaging of the North Ecliptic Pole (NEP) from Hyper Suprime Cam (HSC) on Subaru, which is one third of the expected imaging from our survey. We will select targets from several deg$^2$ of SSA22 and A370, for which we have a combination of HSC and Suprime Cam data. We have developed an observing program to find a substantial number of low metallicity galaxies with enrichment levels less than 10% solar. Galaxies such as these are rare in the local universe and have been shown to increase in number at intermediate redshifts. The strong emission lines and redshifts that we obtain with Hydra on WIYN will help us to optimize our deep spectroscopy with DEIMOS on Keck, where we can measure the weak [OIII]$lambda$4363 as a direct metallicity measure. We will increase the number of directly measured metallicities by a factor of a few and extend galaxy metallicity studies to a redshift of 1. We request 6 nights to continue our observing program.

Program Type: WTAC

Scheduled Nights:
Run 1 (2017B):  WIYN/HYDR -- 5n on Oct 18 - Oct 22 2017


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017B-0823

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