Galaxy Clusters as Tele-ALP-scopes

Who: Joseph Conlon (Oxford U.)
When: Monday, March 23, 2015 at 14:15
Where: The CP³ meeting room

Axion-like particles have good theoretical motivation and are characterised by conversion to photons in astrophysical magnetic fields.

Galaxy clusters are the most efficient convertors of axion-like particles to photons in the universe.

I discuss the physics and phenomenology of ALPs, and describe their astrophysical implications, with particular reference to the recently observed 3.5 keV X-ray line that is a candidate for a dark matter decay line. I discuss interpretations of this line in terms of dark matter decaying to an axion-like particle, that then converts to a photon in cluster magnetic fields, and describe the compatibility of this scenario with data and the different phenomenology for cool-core and non-cool-core clusters.


Slides from the talk