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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9755
DTSTART:20260717T180000Z
DTEND:20260717T190000Z
DTSTAMP:20260716T083930Z
LAST-MODIFIED:20260715T220759Z
LOCATION:Rm 5280 Chamberlin Hall/  https://uwmadison.zoom.us/j/7800277
 255?omn=93178810906
SUMMARY:The HIGH-Z 21-cm Global Spectrum Experiment on Adak Island \, 
 NPAC (Nuclear/Particle/Astro/Cosmo) Forum\, Jeff Peterson\, Carnegie M
 ellon University
DESCRIPTION:I will describe recent deployments of High-Z to Adak Islan
 d\, Alaska.<br>\nHigh-Z is a 21-cm all-sky spectrometer that covers th
 e three-octave range from 25 to 200 MHz. The instrument targets the gl
 obal signal resulting from absorption of cosmic background photons by 
 the 21-cm line of neutral hydrogen during the Cosmic-Dawn era 100-300 
 My after the Big Bang. Detection of this spectral feature would allow 
 us to determine when the first stars began forming in abundance\, the 
 efficiency of that process and the rapidity of development of subseque
 nt neutron-star and black-hole binaries.  If detected\, the spectral f
 eature we seek will ultimately be mapped via the line-intensity mappin
 g process\, similar to the mapping of the Cosmic Microwave Background\
 , but in three dimensions\, rather than two. The High-Z instrument has
  been extensively upgraded\, including new calibrators and a new spect
 rometer. The latest results from High-Z will be presented.<br>\n
URL:https://www.physics.wisc.edu/events/?id=9755
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