Abstract
We searched for an X-ray line at energies around 3.5 keV in deep, ~1.6 Msec
XMM-Newton observations of the dwarf spheroidal galaxy Draco. No line was
found. The data in this energy range are completely consistent with a simple
power law X-ray background, dominated by particle background, plus instrumental
lines; the addition of a ~3.5 keV line feature gives no improvement to the fit.
The corresponding upper limit on the line flux rules out a dark matter decay
origin for the 3.5 keV line found in observations of clusters of galaxies and
in the Galactic Center at greater than 99% C.L..
Users
Please
log in to take part in the discussion (add own reviews or comments).