Roncadelli, M.M.RoncadelliTAVECCHIO, FabrizioFabrizioTAVECCHIO2020-03-092020-03-0920150035-8711http://hdl.handle.net/20.500.12386/23183The work of MR is supported by the INFN grants TaSP and CTA.Preliminary evidence of solar axions in XMM-Newton observations has quite recently been claimed by Fraser et al. as an interpretation of their detection of a seasonally-modulated excess of the X-ray background. Within such an interpretation, these authors also estimate the axion mass to be m<SUB>a</SUB> ≃ 2.3 × 10<SUP>-6</SUP> eV. Since an axion with this mass behaves as a cold dark matter particle, according to the proposed interpretation the considered detection directly concerns cold dark matter as well. So, the suggested interpretation would lead to a revolutionary discovery if confirmed. Unfortunately, we have identified three distinct problems in this interpretation of the observed result of Fraser et al. which ultimately imply that the detected signal - while extremely interesting in itself - cannot have any relation with hypothetical axions produced by the Sun. Thus, a physically consistent interpretation of the observed seasonally-modulated X-ray excess still remains an exciting challenge.STAMPAenArticle10.1093/mnrasl/slv0402-s2.0-84929671193000355346000006https://academic.oup.com/mnrasl/article/450/1/L26/9858122015MNRAS.450L..26RFIS/05 - ASTRONOMIA E ASTROFISICA