Solid tidal friction above a liquid water reservoir as the origin of the south pole hotspot on Enceladus

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HOW THE GEYSERS, TIDAL STRESSES, AND THERMAL EMISSION ACROSS THE SOUTH POLAR TERRAIN OF ENCELADUS ARE RELATED (2014, result): “Thus, any liquid body today may be restricted to a region no larger than the southern hemisphere (180◦ across) or smaller, perhaps only 120◦ across (Tobie et al. 2008), a result consistent with the suggestion (Collins & Goodman 2007) that a localized sea beneath the SPT produces the present-day…”
Enceladus: An Active Ice World in the Saturn System (2013, background): “Conversely, if tidal heating and liquid water are both confined to the south polar region, then steady-state situations permitting a regional sea and matching the observed heat output can be constructed (e.g., Tobie et al. 2008).”
Enceladus's internal ocean and ice shell constrained from Cassini gravity, shape, and libration data (2016, background): “…al., 2006; Hansen et al., 2006; Waite et al., 2006; Spencer et al., 2006], a series of geophysical evidence has hinted at the presence of a liquid water reservoir beneath the ice shell [Collins and Goodman, 2007; Nimmo et al., 2007; Tobie et al., 2008; Iess et al., 2014; Běhounková et al., 2015].”