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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2043
DTSTART:20110203T220000Z
DURATION:PT1H0M0S
DTSTAMP:20240329T051236Z
LAST-MODIFIED:20110126T200434Z
LOCATION:4274 Chamberlin Hall
SUMMARY:Peculiar Velocity and its Effects on Cosmology with 21cm Tomog
raphy\, NPAC (Nuclear/Particle/Astro/Cosmo) Forum\, Yi Mao\, UT Austin
DESCRIPTION:The peculiar velocity of the intergalactic gas responsible
for the cosmic 21cm background from the epoch of reionization and bey
ond introduces an anisotropy in the three-dimensional power spectrum o
f brightness temperature fluctuations. We review how measurement of th
is anisotropy by future 21cm surveys is a promising tool for separatin
g cosmology from 21cm astrophysics. A more careful treatment of the ef
fects of peculiar velocity than previously attempted is necessary\, ho
wever\, to fulfill this promise. In this talk\, we set out to account
for peculiar velocity in every detail\, and clarify the roles of ther
mal vs. velocity broadening and finite optical depth.
\nWe will a
lso find whether nonlinear effect of peculiar velocity may spoil futur
e 21cm measurements. The discussion in this talk\, although in the con
text of the Epoch
\nof Reionization\, may affect the interpretati
on of the 21cm intensity mapping in the post-reionization epoch.
URL:https://www.physics.wisc.edu/events/?id=2043
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