Аннотация
Hitomi observations of Perseus with the Soft X-ray Spectrometer (SXS) provide
a high-resolution look at the 3.5 keV feature reported by multiple groups in
the Perseus cluster. The Hitomi spectrum -- which involves the sum of diffuse
cluster emission and the point-like central Active Galactic Nucleus (AGN) --
does not show any excess at $E 3.5 keV$, giving an apparent
inconsistency with previous observations of excess diffuse emission. We point
out that 2009 Chandra data reveals a strong dip in the AGN spectrum at $E =
(3.54 0.02) keV$ (cluster frame) -- the identical energy to the
diffuse excess observed by XMM-Newton. Scaling this dip to the 2016 AGN
luminosity and adding it to the diffuse XMM-Newton excess, this predicts an
overall dip in the SXS field of view of $(-7.7 4.6) 10^-6 \, \rm
ph \, cm^-2 \, s^-1$ at $E= 3.54$ keV -- a precise match to
the Hitomi data when broadened by the dark matter virial velocity. We describe
models of Fluorescent Dark Matter that can reproduce this physics, in which
dark matter absorbs and then re-emits 3.5 keV photons emitted from the central
AGN.
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