|Speaker: Rogier A. Windhorst (Regents' and Foundation Professor, JWST Interdisciplinary Scientist, Arizona State University)
Title: How will JWST measure First Light, Galaxy Assembly and Supermassive Black Hole Growth: The new Frontier after Hubble
Abstract: The 6.5 meter James Webb Space Telescope (JWST) is designed to measure the epochs of First Light, Reionization, Galaxy Assembly, and Supermassive Black-Hole growth, building on critical lessons learned from the Hubble Space Telescope, including recent results from its Wide Field Camera 3 (WFC3) installed in 2009.
For those in the audience not affiliated with JWST, I will first briefly review the significant technical progress has been made on its design and fabrication: more than 75% of its launch mass has been built, passed final design, or is being built as of Summer 2012. All JWST's 18 flight mirrors have been gold- coated, and its optical performance is predicted to meet or exceed the specifications required for its main science goals. Its four scientific instruments will be delivered to NASA from summer 2012 through spring 2013.
JWST will revolutionize astronomy after its launch in 2018 by measuring the epochs of First Light and Galaxy Assembly in great detail. JWST will measure the first population of massive stars in the first dwarf galaxies, when the expanding universe was 10--20 times smaller than it is today, and only 200-- 500 million years old. These first "Population III-star" dominated objects are expected at redshifts z=10--20, beyond where Hubble's WFC3 can see them. JWST will measure the evolution of the steep faint-end of the dwarf galaxy luminosity function at redshifts z=6--12, which likely provided the UV-flux needed to start and finish cosmic Hydrogen Reionization. I will show what combination of area, depth, and wavelength coverage is needed for JWST to detect a sufficient number of First Light objects, and to measure their evolving luminosity function. I will also show what deep JWST images may look like, sampling young galaxies in the very early universe. This includes a gravitationally distorted universe that acts like a cosmic house of mirrors, where "gravitational lensing bias" from foreground galaxy halos may affect JWST's search for First Light objects at z>8--10. I will show examples of what the first quasars may look like to JWST, addressing if super-massive black- holes grew in lockstep with the process of galaxy assembly. This work was funded by NASA JWST Interdisciplinary Scientist grant NAG5- 12460 from GSFC, and grant HST/DD-11359 from STScI, operated by AURA for NASA under contract NAS 5-26555. See also: http://www.jwst.nasa.gov/ or http://www.asu.edu/clas/hst/www/jwst/
|Date||July 09, 2012|
|Start/End Time||12:00 PM - 01:00 PM|
|Location||Building 34, Room E215|