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SUMMARY:Evidence for the invisible gas around galaxy halos using fast radi
 o bursts from CHIME/FRB
DTSTART;VALUE=DATE-TIME:20261028T170500Z
DTEND;VALUE=DATE-TIME:20261028T171500Z
DTSTAMP;VALUE=DATE-TIME:20261026T092602Z
UID:indico-contribution-3623@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Affan Khadir (McGill University)\nMost of the baryon
 ic mass in galaxy halos consists of diffuse\, magnetized plasma\, which is
  referred to as the circumgalactic medium (CGM). The properties of the CGM
  remain relatively unconstrained\, as the low density of the gas makes it 
 hard to image in most wavelengths of the electromagnetic spectrum. Fast ra
 dio bursts (FRBs) are thus incredibly good probes of this plasma\, because
  they undergo dispersion as they propagate through the CGM.\n \nI used ove
 r 1600 FRB DMs from CHIME/FRB's upcoming Baseband Catalog 2\, which is the
  largest catalog of FRBs that have a localization error of $<1'$\, to cond
 uct an unprecedented statistical study of nearby galaxy halos. In doing so
 \, I obtained the strongest evidence ($p = 0.0053\;\\sim 2.6\\sigma$) for 
 a DM excess due to the CGM to date\, with an amplitude of $119\\pm43\\\,$p
 c$~$cm$^{-3}$. I also obtained some of the first FRB-based constraints of 
 the baryon distribution of the CGM of Milky Way like galaxies\, with tenta
 tive evidence ($\\sim2.4\\sigma$) that galaxy halos in this mass range may
  be more relaxed than previously thought\, almost tracing the underlying d
 ark matter distribution directly. However\, more FRBs are needed to furthe
 r test this. My work demonstrates the power of FRBs to map the invisible d
 iffuse plasma in the Universe and forecasts a $5\\sigma$ detection of the 
 CGM with 10000 FRBs\, which can then be used to place the best constraints
  (amongst all probes of hot plasma) on the distribution of baryons in the 
 CGM.\n\nhttps://nyx.physics.mcgill.ca/event/587/contributions/3623/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3623/
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