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VERSION:2.0
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PRODID:-//Virginia Tech//VT Calendar//EN
BEGIN:VEVENT
DTSTAMP:20161130T183000Z
UID:1474660651957@events.msu.edu
CATEGORIES:Conferences / Seminars / Lectures
DTSTART:20161130T183000Z
DTEND:20161201T045900Z
SUMMARY:Astronomy & Astrophysics Seminar
DESCRIPTION:
 Speaker: Jordan Mirocha\n
 \n
 Speaker's Institution: 
 UCLA\n
 \n
 Seminar Title: The Sky-Averaged 21-cm 
 Background as a Probe of Faint Galaxies 
 at High Redshifts\n
 \n
 Since its modern conception 
 nearly 20 years ago, the redshifted 21-cm 
 background has promised\n
 to revolutionize our 
 understanding of structure formation in the 
 early Universe, starting even\n
 before the formation 
 of the first stars and extending through 
 the late stages of cosmic\n
 reionization. 
 Just in the last year or two, limits from power 
 spectrum experiments have entered\n
 plausible 
 regions of parameter space, with experiments 
 targeting the sky-averaged ("global")\n
 signal 
 seemingly not far behind. Despite steady 
 and clearly complementary progress in the highz\n
 galaxies 
 community, there have been few efforts 
 to model the galaxy luminosity function 
 and\n
 the 21-cm background within a common framework, 
 leaving 21-cm predictions poorly calibrated\n
 and 
 the prospects for overcoming degeneracies 
 in models unclear. In this talk, I 
 will describe a\n
 new model for the global 21-cm 
 signal calibrated to recent measurements 
 of the luminosity\n
 function, as well as the CMB 
 optical depth, z~8 21-cm power spectrum, and 
 X-ray luminosity\n
 star formation rate relation, 
 and show that it leads to qualitatively 
 different predictions than those\n
 that were 
 used to guide the design of the first generation 
 of experiments. I will discuss how our\n
 models 
 might inform ongoing observing campaigns 
 and how an initial detection would provide\n
 important 
 constraints on the efficiency of star 
 formation, escape fraction, and X-ray emissions 
 of\n
 faint galaxies at high redshift.\n\n
 Price: free\n
 Sponsor: Biomedical and Physical Sciences Building\n
 Sponsor's Homepage: https://www.pa.msu.edu/\n
 Contact name: Shawna Prater\n
 Contact email: prater@pa.msu.edu\n
 for more info visit the web at:\n 
 https://www.pa.msu.edu/seminars/ast_seminars/current\n
LOCATION: Room 1400 Biomedical and Physical Sciences Building
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