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ASD Colloquium Series

August

28

Constraining Cosmic Reionization with Hubble, James Webb, and WFIRST
Brant Robertson

Understanding cosmic reionization requires the identification and characterization of early sources of hydrogen-ionizing photons. Through a series of intense observational campaigns with Wide Field Camera 3 aboard Hubble Space Telescope we have now systematically explored the galaxy population deep into the era when cosmic microwave background (CMB) data indicate reionization was underway. High-redshift observations with HST including UDF12, CANDELS, and the Frontier Fields provide the best constraints to date on the abundance, luminosity distribution, and spectral properties of early star-forming galaxies. We synthesize results from these HST campaigns and the most recent constraints from Planck CMB observations to infer redshift-dependent ultraviolet luminosity densities, reionization histories, and the electron scattering optical depth evolution consistent with the available data. We will then preview how James Webb Space Telescope and eventually WFIRST will provide a new window into the reionization epoch and teach us about the physics of galaxy formation in the early universe.

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ASD Colloquia are Tuesdays at 3:45 pm (Meet the Speaker at 3:30 pm) in Bldg 34, Room W150 unless otherwise noted.

 
Date August 28, 2018
Start/End Time 03:45 PM - 05:00 PM
Location B34, W120
Website https://science.gsfc.nasa.gov/660/seminars/ASDcolloq/index.html
Contact Eric Switzer
Email Address eric.r.switzer@nasa.gov
Event Type Seminars/Colloquia
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