  Molecular gas in Arches cloud located near the Arches cluster is one of the
emitters of K-$\alpha$ line of neutral iron and X-ray continuum in the Galactic
center (GC). Similarly to the cloud Sgr B2, another well-known emitter of the
iron line in the GC, the Arches cloud demonstrates temporal decline of the
X-ray emission. The most natural origin of this emission is irradiation of
primary photons of an X-ray flare from a distant source, most likely Sgr A*.
However, recent observations of the Arches cloud discovered variations of
equivalent width of the 6.4 keV iron line, which indicated that the X-ray
emission from the cloud is a combination of two components with different
origin and different equivalent width, one of which is time-variable, while the
other is stationary during the period of observations. We considered two
different scenarios: a) this emission is formed by reflection from two clouds,
which are at some distance from each other, when they are irradiated by two
different flares; and b) the other scenario assumes a combination of X-ray
fluxes produced in the same cloud by reflection of primary photons and by
subrelativistic cosmic rays. We present restrictions for both model and
conditions at which these scenarios can be realized. Although none of the
models can be completely ruled out, we find that the X-ray reflection model
requires less assumption and therefore is the most viable.
