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arXiv · 2610.01877

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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Lidiia Zadorozhna, Denys Malyshev, Oleg Ruchayskiy. 2026-10-01. Recycling serendipitous observations of XRISM for dark matter searches. https://arxiv.org/abs/2610.01877

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