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Searches for 3.5 keV Absorption Features in Cluster AGN Spectra
Joseph P. Conlon
We investigate possible evidence for a spectral dip around 3.5 keV in central cluster AGNs, motivated by previous results for archival Chandra observations of the Perseus cluster a…
Constraints on Massive Axion-Like Particles from X-ray Observations of NGC1275
Linhan Chen, Joseph P. Conlon
If axion-like particles (ALPs) exist, photons can convert to ALPs on passage through regions containing magnetic fields. The magnetised intracluster medium of large galaxy clusters…
Projected bounds on ALPs from Athena
Joseph P. Conlon, Francesca Day, Nicholas Jennings +2
Galaxy clusters represent excellent laboratories to search for Axion-Like Particles (ALPs). They contain magnetic fields which can induce quasi-sinusoidal oscillations in the X-ray…
Can black hole superradiance be induced by galactic plasmas?
Joseph P. Conlon, Carlos A. R. Herdeiro
Highly spinning Kerr black holes with masses are subject to an efficient superradiant instability in the presence of bosons with masses $μ\sim 10^{-10} - 1…