  The recent Madala hypothesis, a conjecture that seeks to explain anomalies
within Large Hadron Collider (LHC) data (particularly in the transverse
momentum of the Higgs boson), is interesting for more than just a statistical
hint at unknown and unpredicted physics. This is because the model itself
contains additional new particles that may serve as Dark Matter (DM)
candidates. These particles interact with the Standard Model via a scalar
mediator boson $S$. More interesting still, the conjectured mass range for the
DM candidate ($65$ - $100$ GeV) lies within the region of models viable to try
explain the recent Galactic Centre (GC) gamma-ray excess seen by Fermi Large
Area Telescope (Fermi-LAT) and the High Energy Stereoscopic System (HESS).
Therefore, assuming $S$ decays promptly, it should be possible to check what
constraints are imposed upon the effective DM annihilation cross-section in the
Madala scenario by hunting signatures of $S$ decay that follows DM annihilation
within dense astrophysical structures. In order to make use of existing data,
we use the Reticulum II dwarf galaxy and the galactic centre gamma-ray excess
data sets from Fermi-LAT, and compare these to the consequences of various
decay paths for $S$ in the aforementioned environments. We find that, based on
this existing data, we can limit $\tau$ lepton, quark, direct gamma-ray, and
weak boson channels to levels below the canonical relic cross-section. This
allows us to set new limits on the branching ratios of $S$ decay, which can
rule out a Higgs-like decay branching for $S$, in the case where the Madala DM
candidate is assumed to comprise all DM.
