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A central question regarding Ultra Diffuse Galaxies (UDGs) is whether theyare a separate category to Low Surface Brightness (LSB) galaxies, or just theirnatural continuation towards low stellar masses. In this letter, we show thatthe rotation curve of the gas rich UDG AGC 242019 is well fit by a dark matterhalo with inner slope that asymptotes to -0.54, and that such fit provides aconcentration parameter that matches theoretical expectations. This finding,together with previously works in which shallow inner profiles are derived forUDGs, shows that the structural properties of these galaxies are like otherobserved LSBs. UDGs show slowly rising rotation curves and this favoursformation scenarios in which internal processes, such as SNae driven gasoutflows, are acting to modify UDGs profiles.

A shallow dark matter halo in Ultra Diffuse Galaxy AGC 242019: are UDGs structurally similar to low surface brightness galaxies?