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Technical comment on the paper of Dessert et al. "The dark matter interpretation of the 3.5 keV line is inconsistent with blank-sky observations"

by Alexey Boyarsky, Denys Malyshev, Oleg Ruchayskiy, Denys Savchenko

Submission summary

As Contributors: Denys Savchenko
Arxiv Link: (pdf)
Date submitted: 2020-09-02 10:35
Submitted by: Savchenko, Denys
Submitted to: SciPost Astronomy Core
Academic field: Astronomy
  • High-Energy Physics - Phenomenology
  • Cosmology and Nongalactic Astrophysics
  • High Energy Astrophysical Phenomena


An unidentified line at energy around 3.5 keV was detected in the spectra of dark matter-dominated objects. Recent work of Dessert et al. [1812.06976] used 30 Msec of XMM-Newton blank-sky observations to constrain the admissible line flux, challenging its dark matter decay origin. We demonstrate that these bounds are overestimated by more than an order of magnitude due to improper background modeling. Therefore the dark matter interpretation of the 3.5 keV signal remains viable.

Current status:
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Submission 2004.06601v1 on 2 September 2020

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