NOAO >   Observing Info >   Approved Programs >   2019B-0507

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Program Information for 2019B-0507


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

CoI: Bart Wakker, U. of Wisconsin, Madison
CoI: Tae Sun Kim, U. of Wisconsin, Madison

Title: Deep imaging and spectroscopy of [OIII] absorber fields

Abstract: We propose to continue the deep multi-band imaging of the fields of 21 quasars that contain intervening [OIII] systems in their spectra. We propose for 2 nights with HYDRA to perform the spectroscopic followup of candidate galaxies that are associated with our lowest redshift absorber. This is a two stage observation campaign to study galactic outflows using emission and absorption abundance measures, the imaging being done with WIYN and spectroscopy with larger telescopes. The absorption systems contain unsaturated far UV lines for at least two oxygen ions (OII,OIII,OIV,OV,OVI) and the Lyman series that allow for a measurement of the oxygen phase abundance, [O/H], in the circumgalactic medium (CGM) of low redshift galaxies. The absorbers are likely associated with emission line galaxies with L/L* $>$ 0.1 within several arc minutes of the sightline ($< Mpc proper), whose properties allow for a measure of [O/H] within their star forming regions. We will uncover whether there is a difference between [O/H] in emission and absorption, which sheds light on the propagation speed and evolution of galactic outflows thought to be in part powered by star formation. We have or will have completed textit{g'r'i'z'} imaging for 12 of the 21 fields by the time of these observations. We propose here to complete the imaging for at least 6 of the remaining fields that already have textit{r'i'z'} imaging. We ask for 4 dark nights in Nov/Dec in order to complete the textit{g'} imaging for these fields, as well as fill in gaps for the nine fields that are incomplete. We ask for 2 dark nights in January to perform Hydra followup in the field of PG1116+215, which has several bright galaxies close to the line of sight bright and is our lowest redshift absorber, thus the only absorber where Hydra followup is feasible.

Program Type: WTAC

Scheduled Nights:
Run 1 (2019B):  WIYN/HYDR -- 1n on Dec 20 2019
Run 2 (2019B):  WIYN/ODI -- 2n on Dec 22 - Dec 23 2019


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