Resurrecting Hitomi for Decaying Dark Matter and Forecasting Leading Sensitivity for XRISM

Dessert, Christopher; Ning, Orion; Rodd, Nicholas L.; Safdi, Benjamin R.

doi:10.1103/physrevlett.132.211002

Resurrecting Hitomi for Decaying Dark Matter and Forecasting Leading Sensitivity for XRISM

Journal Article · Fri May 24 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.132.211002· OSTI ID:2429401

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New York Univ. (NYU), NY (United States); Flatiron Institute, New York, NY (United States)
University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
European Organization for Nuclear Research (CERN), Geneva (Switzerland)

The Hitomi x-ray satellite mission carried unique high-resolution spectrometers that were set to revolutionize the search for sterile neutrino dark matter (DM) by looking for narrow x-ray lines arising from DM decays. Unfortunately, the satellite was lost shortly after launch, and to date the only analysis using Hitomi for DM decay used data taken towards the Perseus cluster. Here, in this work we present a significantly more sensitive search from an analysis of archival Hitomi data towards blank sky locations, searching for DM decaying in our own Milky Way. The recently launched XRISM satellite has nearly identical soft-x-ray spectral capabilities to Hitomi; we project the full-mission sensitivity of XRISM for analyses of their future blank-sky data, and we find that XRISM will have the leading sensitivity to decaying DM for masses between roughly 1 to 18 keV, with important implications for sterile neutrino and heavy axionlike particle DM scenarios.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; SC0019225

OSTI ID:: 2429401

Alternate ID(s):: OSTI ID: 2474376

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 132; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Resurrecting Hitomi for Decaying Dark Matter and Forecasting Leading Sensitivity for XRISM

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