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BEGIN:VEVENT

CATEGORIES:Lectures/Conferences
CATEGORIES:Utilities
CATEGORIES:Lecture/Talk
CATEGORIES:Panel/Seminar/Colloquium
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=00f1fcdb-0f068baf-010f-068baf83-00000004:None
CREATED:20240215T170840Z
DESCRIPTION:As cosmic microwave background (CMB) photons propagate through
  the Universe\, their interactions with matter imprint various properties
  of the matter onto the CMB. These imprints can probe otherwise difficult
  to measure baryons such as the ionized gas around galaxies\, which is to
 o cool to emit X-rays and does not have optical/IR tracer light (i.e. sta
 rs). Patchy screening\, the net effect of CMB photons Thomson scattering 
 into and out of the line of sight\, can directly probe the density profil
 e of this gas. Measuring this effect does not require redshift informatio
 n and thus is complementary to other gas probes like the thermal and kine
 matic Sunyaev-Zel'dovich effects. In this talk\, I will introduce a new p
 atchy screening estimator we have derived that is robust to biases from l
 ensing and extragalactic foregrounds. I will then describe our analysis u
 sing this new estimator with data from the Atacama Cosmology Telescope an
 d unWISE galaxy catalog to measure patchy screening at >7 sigma significa
 nce\, the first detection of the effect.  Our measurement of the average 
 gas density profile around unWISE galaxies provides further evidence that
  the circumgalactic gas is more extended than the underlying dark matter 
 distribution and\, with further modeling\, has the power to constrain bar
 yonic feedback models\, a major uncertainty in hydrodynamical simulations
  and optical weak lensing analyses. Finally\, I will present detection fo
 recasts for future CMB and large-scale structure surveys\, including CMB-
 S4 and Rubin LSST\, which show patchy screening will be a powerful probe 
 of small-scale baryonic physics and cosmological parameters.
DURATION:PT1H
DTSTAMP:20240216T153552Z
DTSTART;TZID=America/New_York:20240222T140000
LAST-MODIFIED:20240216T153552Z
LOCATION;X-BEDEWORK-UID=18832edc-1c2ecfef-011c-32333fc8-00000043:Physics 2
 98
STATUS:CONFIRMED
SUMMARY:Cosmology Seminar - Detecting Patchy Screening of the Cosmic Micro
 wave Background
UID:CAL-8a0292fd-8d13410f-018d-adbde991-00003da7demobedework@mysite.edu
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Lecture_Talk:/user/public-us
 er/Lectures_Conferences/Lecture_Talk
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Panel_Seminar_Colloquium:/us
 er/public-user/Lectures_Conferences/Panel_Seminar_Colloquium
X-BEDEWORK-STUDENT-CONTACT;X-BEDEWORK-PARAM-EMAIL=michael.troxel@duke.edu:
 Michael Troxel
X-BEDEWORK-SPEAKER:Theo Schutt
X-BEDEWORK-DUKE-SERIES:Cosmology Seminar
X-BEDEWORK-SUBMITTEDBY:rlf41 for Physics (agrp__ArtsandSciences_Physics)
END:VEVENT
END:VCALENDAR