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PreprintarXiv licencearXiv

Recycling serendipitous observations of XRISM for dark matter searches

  • Lidiia Zadorozhna
  • Denys Malyshev
  • Oleg Ruchayskiy
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Abstract

Searches for radiative decays of keV-mass dark matter have been limited by energy resolution. We propose a strategy for the XRISM/Resolve low count rate observations, and search the 3.48-3.56 keV band for a decay line from the Milky Way halo. Despite a lower exposure, our bounds are stronger than those from XRISM observations of galaxy clusters. We also identify a residual at E = 3.5311 keV with ~3sigma local significance, coincident with the previously reported unidentified feature, and having no plausible atomic or instrumental counterpart. These bounds will continue to tighten as additional pointings become available.

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Cite

BibTeXRIS
BibTeX
@misc{zadorozhna2026recycling,
  title = {{Recycling serendipitous observations of XRISM for dark matter searches}},
  author = {Lidiia Zadorozhna and Denys Malyshev and Oleg Ruchayskiy},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.01877},
  eprint = {2610.01877},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.01877},
}
RIS
TY  - UNPB
TI  - Recycling serendipitous observations of XRISM for dark matter searches
AU  - Lidiia Zadorozhna
AU  - Denys Malyshev
AU  - Oleg Ruchayskiy
PY  - 2026
DA  - 2026/10/01
PB  - arXiv
DO  - 10.48550/arxiv.2610.01877
UR  - https://arxiv.org/abs/2610.01877
AB  - Searches for radiative decays of keV-mass dark matter have been limited by energy resolution. We propose a strategy for the XRISM/Resolve low count rate observations, and search the 3.48-3.56 keV band for a decay line from the Milky Way halo. Despite a lower exposure, our bounds are stronger than those from XRISM observations of galaxy clusters. We also identify a residual at E = 3.5311 keV with ~3sigma local significance, coincident with the previously reported unidentified feature, and having no plausible atomic or instrumental counterpart. These bounds will continue to tighten as additional pointings become available.
ER  -