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Testing the origin of ~3.55 keV line in individual galaxy clusters observed with XMM-Newton

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arxiv 1508.05186 v1 pith:FYSV7OUO submitted 2015-08-21 astro-ph.HE astro-ph.COhep-ph

Dmytro Iakubovskyi , Esra Bulbul , Adam R. Foster , Denys Savchenko , Valentyna Sadova This is my paper · ORCID
classification astro-ph.HEastro-ph.COhep-ph
keywords lineobservedclustersdarkgalaxymattercosmicdecaying
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If the unidentified emission line at ~3.55 keV previously found in spectra of nearby galaxies and galaxy clusters is due to radiatively decaying dark matter, one should detect the signal of comparable strength from many cosmic objects of different nature. By studying existing dark matter distributions in galaxy clusters we identified top-19 of them observed by XMM-Newton X-ray cosmic mission, and analyzed the data for the presence of the new line. In 8 of them, we identified > 2 sigma positive line-like residuals with average position 3.52 +/- 0.08 keV in the emitter's frame. Their observed properties are unlikely to be explained by statistical fluctuations or astrophysical emission lines; observed line position in M31 and Galactic Center makes an additional argument against general-type systematics. Being interpreted as decaying dark matter line, the new detections correspond to radiative decay lifetime tau_dm ~ (3.5-6) x 10^27 s consistent with previous detections.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact

    astro-ph.HE 2019-08 accept novelty 6.0 of 10

    A 190 kilosecond NuSTAR search at high Galactic latitude finds no sterile-neutrino dark matter decay line and improves the leading upper limit by a factor of about two for 10-12 keV masses.

  2. Revisiting the expected Micro-X signal from the 3.5 keV line

    astro-ph.IM 2019-08 conditional novelty 4.0 of 10

    Using newly measured off-centre 3.5 keV line fluxes, the expected Micro-X signal drops from 18.2 to 3.4-4.3 counts, too few for a single-flight detection.

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