# 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
}
}
• Published 17 February 2014
• Physics
• Physical review letters
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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