  Right-handed neutrinos offer an elegant solution to two well established
phenomena beyond the Standard Model (SM) - masses and oscillations of
neutrinos, as well as the baryon asymmetry of the Universe. It is also a
minimalistic solution since it requires only singlet Majorana fermions to be
added to the SM particle content. If these fermions are nearly degenerate, the
mass scale of right-handed neutrinos can be very low and accessible by the
present and planned experiments. There are at least two well studied mechanisms
of the low-scale leptogenesis: baryogenesis via oscillations and resonant
leptogenesis. These two mechanisms were often considered separate, but they can
in fact be understood as two different regimes of one and the same mechanism,
described by a unique set of quantum kinetic equations. In this work we show,
using a unified description based on quantum kinetic equations, that the
parameter space of these two regimes of low-scale leptogenesis significantly
overlap. We present a comprehensive study of the parameter space of the
low-scale leptogenesis with the mass scale ranging from $0.1$ GeV to $\sim
10^6$ GeV. The unified perspective of this work reveals the synergy between
intensity and energy frontiers in the quest for heavy Majorana neutrinos.
