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We studied the central region of bipolar nebula M\,2-9 using radio-continuumobservations obtained from the Jansky Very Large Array (JVLA) and the AtacamaLarge Millimeter Array (ALMA) interferometers. This work presents new images at$\sim$ 43 GHz ($\sim$ 7.0 mm) and $\sim$ 345 GHz ($\sim$ 0.9 mm) with angularresolutions of $\sim$ 0$\rlap{.}^{\prime\prime}$047 and0$\rlap{.}^{\prime\prime}$09, respectively. The continuum emission at $\sim$ 43GHz shows an elongated jet-like structure perpendicular to the $\sim$ 345 GHzobservation. We conclude that both emissions could correspond to tracing anisothermal collimated fast wind with constant expansion velocity and beingdriven by the circumstellar ring traced by ALMA. Although this configurationhas been discussed within the scope of planetary nebulae models, there is aremarkable fact: the collimated fast wind shows morphological spatialvariability. This supports the idea of a symbiotic binary system within theinnermost part of M\,2-9, which would be composed of a white dwarf and an AGBstar. The latter could explain the mirror symmetry observed at larger scalesdue to their orbital motion.

The symbiotic and bipolar nebula M2-9: Morphological variability of the collimated ionized wind arising from the core