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It has been known for some time that the Milky Way is a barred disk galaxy.More recently several studies inferred from starcount observations that theGalaxy must contain a separate, new, flat long bar component, twisted relativeto the barred bulge. Here we use a simulation with a boxy bulge and bar tosuggest that these observations can be reproduced with a single structure. Inthis simulation a stellar bar evolved from the disk, and the boxy bulgeoriginated from it through secular evolution and the buckling instability. Wecalculate starcount distributions for this model at different longitudes andlatitudes, in a similar way as observers have done for resolved starcounts.Good agreement between the simulation and the observations can be achieved fora suitable snapshot, even though the simulation has a single boxy bulge andbar} structure. In this model, part of the long bar signature is due to avolume effect in the starcounts, and another part is due to chosing a snapshotin which the planar part of the boxy bulge and bar has developed leading endsthrough interaction with the adjacent spiral arm heads. We also providepredictions from this model for the line-of-sight velocity distributions at thelongitudes with the long bar signature, for comparison with upcoming surveys.

Unifying boxy bulge and planar long bar in the Milky Way