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Studies of the red clump giant population in the inner Milky Way suggest theGalactic bulge/bar has a boxy/peanut/X-shaped structure as predicted by itsformation via a disc buckling instability. We used a non-parametric method ofestimating the Galactic bulge morphology that is based on maximum entropyregularisation. This enabled us to extract the three-dimensional distributionof the red giant stars in the bulge from deep photometric catalogues of theVISTA Variables in the Via Lactea (VVV) survey. Our high-resolutionreconstruction confirms the well-known boxy/peanut/X-shaped structure of thebulge. We also find spiral arm structures that extend to around three kpc infront of and behind the bulge and are on different sides of the bulge majoraxis. We show that the detection of these structures is robust to theuncertainties in the luminosity function.

Non-Parametric Density Reconstruction of the Galactic Bulge Area using Red Clump Stars in the VVV Survey