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Chandra observations of the nearby, candidate Lyman-continuum (LyC) emittinggalaxy Tol 0440-381 show brightening of an X-ray source by at least a factor of4 to a luminosity of 1.6E40 erg/s over 3.8~days. The X-ray emission likelyarises from either a low-luminosity AGN or an ultraluminous X-ray source. Theproperties of the X-ray source are similar to those found in Haro 11 and Tololo1247-232, the only other LyC-emitting galaxies that have been resolved inX-rays. All three galaxies host luminous, variable, and hard spectrum X-raysources that are likely accretion-powered. Accretion onto compact objectsproduces powerful outflows and ionizing radiation that could help enable LyCescape.

Rapid turn-on of a luminous X-ray source in the candidate Lyman continuum emitting galaxy Tol 0440-381