Deep Search for Decaying Dark Matter with XMM-Newton Blank-Sky Observations

Foster, Joshua W.; Kongsore, Marius; Dessert, Christopher; Park, Yujin; Rodd, Nicholas L.; Cranmer, Kyle; Safdi, Benjamin R.

doi:10.1103/physrevlett.127.051101

Deep Search for Decaying Dark Matter with XMM-Newton Blank-Sky Observations

Journal Article · Fri Jul 30 00:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.051101· OSTI ID:1821150

Foster, Joshua W. ^[1]; ^[2]; ^[1]; ^[1]; Rodd, Nicholas L. ^[3]; Cranmer, Kyle ^[4]; ^[3]

Univ. of Michigan, Ann Arbor, MI (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
New York Univ. (NYU), NY (United States)

Sterile neutrinos with masses in the keV range are well-motivated extensions to the Standard Model that could explain the observed neutrino masses while also making up the dark matter (DM) of the universe. If sterile neutrinos are DM then they may slowly decay into active neutrinos and photons, giving rise to the possibility of their detection through narrow spectral features in astrophysical x-ray data sets. Here, we perform the most sensitive search to date for this and other decaying DM scenarios across the mass range from 5 to 16 keV using archival XMM-Newton data. We reduce 547 Ms of data from both the MOS and PN instruments using observations taken across the full sky and then use this data to search for evidence of DM decay in the ambient halo of the Milky Way. We determine the instrumental and astrophysical baselines with data taken far away from the Galactic Center, and use Gaussian process modeling to capture additional continuum background contributions. No evidence is found for unassociated x-ray lines, leading us to produce the strongest constraints to date on decaying DM in this mass range.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

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

OSTI ID:: 1821150

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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