ALP Conversion and the Soft X-ray Excess in the Outskirts of the Coma Cluster
arXiv:1406.5188 · doi:10.1088/1475-7516/2015/01/011
Abstract
It was recently found that the soft X-ray excess in the center of the Coma cluster can be fitted by conversion of axion-like-particles (ALPs) of a cosmic axion background (CAB) to photons. We extend this analysis to the outskirts of Coma, including regions up to 5 Mpc from the center of the cluster. We extract the excess soft X-ray flux from ROSAT All-Sky Survey data and compare it to the expected flux from ALP to photon conversion of a CAB. The soft X-ray excess both in the center and the outskirts of Coma can be simultaneously fitted by ALP 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 ALP-photon couplings are derived.
21 pages, 7 figures
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- Searching for Axion-Like Particles from Core-Collapse Supernovae with Fermi LAT's Low Energy Technique
- Anisotropies in Non-Thermal Distortions of Cosmic Light from Photon-Axion Conversion
- Active galactic nuclei through the prism of galaxy clusters: bounds on axion-like particles
- Sensitivity to Axion-like Particle dark matter with very-high-energy gamma-ray observations of Active Galactic Nuclei located behind Galaxy Clusters