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.
Dark Matter Velocity Spectroscopy
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abstract
Dark matter decays or annihilations that produce line-like spectra may be smoking-gun signals. However, even such distinctive signatures can be mimicked by astrophysical or instrumental causes. We show that velocity spectroscopy-the measurement of energy shifts induced by relative motion of source and observer-can separate these three causes with minimal theoretical uncertainties. The principal obstacle has been energy resolution, but upcoming experiments will reach the required 0.1% level. As an example, we show that the imminent Astro-H mission can use Milky Way observations to separate possible causes of the 3.5-keV line. We discuss other applications.
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NuSTAR Tests of Sterile-Neutrino Dark Matter: New Galactic Bulge Observations and Combined Impact
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.