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SUMMARY:The Complexity of Extinction at High-Galactic Latitudes - Matthew 
 O'Callaghan
DTSTART:20231018T121500Z
DTEND:20231018T124000Z
UID:TALK207466@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Studying the interstellar medium (ISM) at high-galactic latitu
 des is of paramount importance for mitigating the impact of the dusty fore
 ground when detecting a B-mode polarisation signal in the cosmic microwave
  background. Extinction serves as an invaluable tracer for the dusty ISM w
 ithin the Galaxy. In this talk\, we will delve into the challenges that ar
 ise when attempting to constrain extinction at high-galactic latitudes.\nI
  will demonstrate that in situations where extinction is low\, complex\, a
 nd multi-modal posterior distributions emerge due to degeneracies between 
 extinction and other stellar features. Relying on a single point estimate 
 for slight variations in extinction becomes unreliable and understanding e
 xtinction using photometry alone falls short of the mark. We will also sho
 w that using spectroscopically derived estimates of effective temperature 
 can significantly reduce model degeneracies\, thus narrowing down the post
 erior\, but the posterior is highly dependent on the assumed measurement e
 rror.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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