BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Extragalactic Probes for a Galactic Model: Validating the NE2025 G
 alactic Electron Density Model using CHIME Fast Radio Bursts Scattering Me
 asurements
DTSTART;VALUE=DATE-TIME:20261028T181800Z
DTEND;VALUE=DATE-TIME:20261028T181900Z
DTSTAMP;VALUE=DATE-TIME:20261023T011135Z
UID:indico-contribution-3678@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Daniel Amouyal (McGill University)\nModels of the Ga
 lactic electron density are widely used to predict distances and scatterin
 g of compact radio sources\, and to account for interstellar medium foregr
 ounds in extragalactic studies. The recently updated NE2025 model (Ocker &
  Cordes 2026) offers improvements over its predecessor\, the commonly refe
 renced NE2001. However\, its scattering predictions have yet to be tested 
 by extra-galactic sources. In this talk\, I will present a direct test usi
 ng fast radio bursts (FRBs) detected by CHIME/FRB. Since FRB signals propa
 gate through the full Galactic interstellar medium\, their observed scatte
 ring must equal or exceed the Milky Way contribution\, making them natural
  constraints on Galactic scattering models. Using CHIME/FRB baseband data\
 , we measure scattering timescales at microsecond-to-millisecond precision
  and compare them to the NE2025 prediction along each line of sight. I wil
 l show that while most FRBs are scattered well beyond the Galactic predict
 ion\, a subset of minimally scattered FRBs place hard upper limits on the 
 true Galactic scattering\, clustering in a region of overestimation by NE2
 025 . I will discuss what these sightlines can reveal regarding specific m
 odel parameters\, and the outlook for using FRBs to calibrate future model
 s.\n\nhttps://nyx.physics.mcgill.ca/event/587/contributions/3678/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3678/
END:VEVENT
END:VCALENDAR