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SUMMARY:Murdin Prize Ceremony -- Constraining Beyond the Standard Model Ph
 ysics with X-ray telescopes: Tightest constraints on low-mass Axion Like P
 articles with Chandra observations of H1821+643 - Julia Sisk Reynes
DTSTART:20230125T134500Z
DTEND:20230125T140000Z
UID:TALK196354@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Axion-Like Particles (ALPs) are a well-motivated extension to 
 the Standard Model of particle physics. In the presence of a magnetised pl
 asma such as the intracluster medium (ICM) in galaxy clusters\, light may 
 inter-convert into ALPs of a given mass m as determined by the ALP-photon 
 coupling strength. At X-ray energies\, we would expect photon-ALP oscillat
 ions to induce energy-dependent modulations on the intrinsic spectra of ce
 ntral AGN as their quanta travel through the magnetised ICM. This can be u
 sed to place bounds on the ALP-photon coupling for very-light ALPs\, that 
 is\, of log(m/eV) < -12\, given a model for the ICM magnetic field. I will
  present the tightest constraints to-date on such ALPs\, which we inferred
  using a deep Chandra grating observation of the extraordinarily luminous 
 radio-quiet cluster-hosted quasar H1821+643.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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