Constraints on Axion-Like Particles from Non-Observation of Spectral Modulations for X-ray Point Sources

Abstract

We extend previous searches for X-ray spectral modulations induced by ALP-photon conversion to a variety of new sources, all consisting of quasars or AGNs located in or behind galaxy clusters. We consider a total of seven new sources, with data drawn from the Chandra archive. In all cases the spectrum is well fit by an absorbed power-law with no evidence for spectral modulations, allowing constraints to be placed on the ALP-photon coupling parameter $g_{a\gamma \gamma }$. Two sources are particularly good: the Seyfert galaxy 2E3140 in A1795 and the AGN NGC3862 within the cluster A1367, leading to 95\% bounds for light ALPs ($m_a\lesssim 10^{-12}\mathrm{eV}$) of $g_{a\gamma \gamma }\lesssim 1.5\times 10^{-12}{\mathrm{GeV}}^{-1}$ and $g_{a\gamma \gamma }\lesssim 2.4\times 10^{-12}{\mathrm{GeV}}^{-1}$ respectively.

17 pages

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