NOAO >   Observing Info >   Approved Programs >   2018B-0327

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Program Information for 2018B-0327


PI: Sangeeta Malhotra, NASA Goddard Space Flight Center, Sangeeta.Malhotra@nasa.gov
Address: Astrophysics Division, 8800 Greenbelt Road, Greenbelt, MD 20771 USA

CoI: James Rhoads, NASA Goddard Space Flight Center
CoI: Zhenya Zheng, SHAO
CoI: Junxian Wang, University of Science & Technology of China
CoI: Leopoldo Infante, Carnegie Observatories
CoI: Felipe Barrientos, Pontificia Universidad Catolica de Chile
CoI: Alistair Walker, NOIRLab
CoI: Weida Hu, University of Science & Technology of China
CoI: Huan Yang, Carnegie Observatories
CoI: Wenyong Kang, University of Science & Technology of China
CoI: Tianxing Jiang, Arizona State U.

Title: Lyman Alpha Galaxies in the Epoch of Reionization

Abstract: lya emitting galaxies offer powerful tests of reionization because lya light is resonantly scattered. In a neutral IGM, this scattering renders fainter lya sources undetectable. This ``disappearing act'' is most powerful as a local test for neutral gas during the central stages of reionization, when we expect to see large spatial inhomogenieties. We have been conducting a definitive narrowband LAE survey project at $zapprox$ 7 --- ``Lyman Alpha Galaxies in the Epoch of Reionization (LAGER).'' This survey exploits DECam's uniquely large FOV and QE in the near-infrared, as well as a custom narrowband filter at 9640AA built for DECam. After analysing the first two fields {it we believe that we may have found found the central stage of reionization at $z=6.9$.} We find variations in number densities amongst the fields that we have observed and within fields. More interestingly, we find an excess of luminous lya galaxies, indicating ionized bubbles that boost lya transmission. We now request a long term allocation of time over 2 years, split between NOAO and Chile, to finish our search for Lyman-Alpha galaxies. We will extend the survey to eight fields in order to detect 600 $zapprox 7$ lya galaxies. This will allow us to quantify the neutral fraction of IGM to within 10% at $zapprox 7$ by measuring the imprint of neutral gas on their clustering properties.

Program Type: Long Term/Extragalactic

Scheduled Nights:
Run 1 (2018B):  CT-4m/DECam -- 4n on Aug 14 - Aug 17 2018
Run 1 (2019A):  CT-4m/DECam -- 5n on Apr 10 - Apr 14 2019
Run 1 (2019B):  CT-4m/DECam -- 5n on Sep 18 - Sep 22 2019
Run 1 (2020A):  CT-4m/DECam -- 5n on Apr 12 - Apr 17 2020
Run 1 (2021A):  CT-4m/DECam -- 5.5n on Feb 03 - Feb 06 2021, Feb 15 2021, Feb 17 - Feb 18 2021, Mar 01 2021, Mar 28 - Mar 29 2021


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NOAO >   Observing Info >   Approved Programs >   2018B-0327

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