Evidence against the decaying dark matter interpretation of the 3.5 keV line from blank sky observations. (arXiv:1812.06976v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Dessert_C/0/1/0/all/0/1">Christopher Dessert</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rodd_N/0/1/0/all/0/1">Nicholas L. Rodd</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Safdi_B/0/1/0/all/0/1">Benjamin R. Safdi</a>
X-ray observations of nearby clusters and galaxies have reported an
unexpected X-ray line around 3.5 keV. This line has received significant
attention due to its possible explanation through decaying dark matter; in
particular, decaying sterile neutrino models, with a sterile neutrino mass
around 7 keV, provide a good fit to the available data. We use over 30 Ms of
XMM-Newton blank-sky observations to search for evidence of the 3.5 keV line
consistent with arising from decaying dark matter within the ambient halo of
the Milky Way. We find the strongest limits to-date on the lifetime of dark
matter in this mass range, strongly disfavoring the possibility that the 3.5
keV line originates from dark matter decay.
X-ray observations of nearby clusters and galaxies have reported an
unexpected X-ray line around 3.5 keV. This line has received significant
attention due to its possible explanation through decaying dark matter; in
particular, decaying sterile neutrino models, with a sterile neutrino mass
around 7 keV, provide a good fit to the available data. We use over 30 Ms of
XMM-Newton blank-sky observations to search for evidence of the 3.5 keV line
consistent with arising from decaying dark matter within the ambient halo of
the Milky Way. We find the strongest limits to-date on the lifetime of dark
matter in this mass range, strongly disfavoring the possibility that the 3.5
keV line originates from dark matter decay.
http://arxiv.org/icons/sfx.gif
