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Dwarf spheroidal galaxies (dSph) orbiting the Milky Way are complex objectsoften with complicated star formation histories and internal dynamics. In thiswork, we search for stellar substructures in four of the classical dSphsatellites of the Milky Way: Sextans, Carina, Leo I, and Leo II. We apply twomethods to search for stellar substructure: the minimum spanning tree method,which helps us to find and quantify spatially connected structures, and the"brute-force" method, which is able to find elongated stellar substructures. Wedetected the previously known substructure in Sextans, and also found a newstellar substructure within Sextans. Furthermore, we identified a new stellarsubstructure close to the core radius of the Carina dwarf galaxy. We report adetection of one substructure in Leo I and two in Leo II, but we note that weare dealing with a low number of stars in the samples used. Such old stellarsubstructures in dSph galaxies could help us to shed light on the nature of thedark matter halos, within which such structures form, evolve, and survive.

Cold, old and metal-poor: New stellar substructures in the Milky Way's dwarf spheroidals