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Using the Multi Unit Spectroscopic Explorer (MUSE) instrument on the VeryLarge Telescope, we identified three bubble nebulae (denoted as A, B, and C)around an ultraluminous X-ray source (ULX) in NGC 55. Bubble A shows a regularelliptical shape surrounding the ULX, with a morphology similar to thecanonical ULX bubble around NGC 1313 X-2. It is most likely inflated by the ULXdisk wind with a mechanical power close to $10^{39}$ erg s$^{-1}$. Bubble Blies 11\arcsec\ away from the ULX on the sky plane and is not contiguous toBubble A. It displays a bow shock like morphology, and is likely driven by acollimated dark jet from the ULX with a mechanical power of about $3 \times10^{38}$ erg s$^{-1}$. If this scenario is correct, we predict that Bubble Bshould present radio emission with a flux of about $1 - 10^2$ $\mu$Jy at 5 GHz.Bubble C appears within Bubble A, with a velocity and velocity dispersiondistinct from the rest of Bubble A. Its nature is unclear and could be part ofBubble A as a result of low local density. The optical counterpart of ULX-1exhibits a broad H$\alpha$, consistent with emission from a hot disk wind.

Identification of Bubble Nebulae around NGC 55 ULX-1 with MUSE Observations