Unidentified line in x-ray spectra of the Andromeda galaxy and Perseus galaxy cluster.

@article{Boyarsky2014UnidentifiedLI,
  title={Unidentified line in x-ray spectra of the Andromeda galaxy and Perseus galaxy cluster.},
  author={Alexey Boyarsky and Oleg Ruchayskiy and Dmytro Iakubovskyi and Jeroen Franse},
  journal={Physical review letters},
  year={2014},
  volume={113 25},
  pages={
          251301
        }
}
We report a weak line at 3.52±0.02  keV in x-ray spectra of the Andromeda galaxy and the Perseus galaxy cluster observed by the metal-oxide-silicon (MOS) and p-n (PN) CCD cameras of the XMM-Newton telescope. This line is not known as an atomic line in the spectra of galaxies or clusters. It becomes stronger towards the centers of the objects; is stronger for Perseus than for M31; is absent in the spectrum of a deep "blank sky" data set. Although for each object it is hard to exclude that the… 
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