21-26 July 2014
Renold Building
Europe/London timezone
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Axion Conversion and the Soft X-ray Excess in the Outskirts of the Coma Cluster

Presented by Mr. Markus RUMMEL on 22 Jul 2014 from 15:30 to 15:50
Type: Formal SUSY and Strings
Track: Formal SUSY and Strings


Recently, it was found that the soft X-ray excess in the center of Coma can be explained by axion to photon conversion of a cosmic axion background (CAB). We extend this analysis to the outskirts of Coma, including regions up to 5 Mpc from the center of the cluster. We extract the soft X-ray flux from ROSAT All-Sky Survey data and compare it to the expected flux from axion to photon conversion of a CAB. The soft X-ray excess both in the center and the outskirts of Coma can be simultaneously explained by axion to photon conversion of a CAB. Given the uncertainties of the cluster magnetic field in the outskirts we constrain the parameter space of the CAB. In particular, an upper limit on the CAB mean energy and a range of allowed axion photon couplings are derived.


Location: Renold
Room: E1

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