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The {\it Gaia} eDR3 catalogue has recently been used to study statisticallythe internal kinematics of wide binary populations using relative velocities ofthe two component stars, $\Delta V$, total binary masses, $m_{B}$, andseparations, $s$. For $s \gtrsim 0.01$ pc, these binaries probe the lowacceleration $a \lesssim 2a_{0}$ regime where gravitational anomalies usuallyattributed to dark matter are observed in the flat rotation curves of spiralgalaxies, where $a_{0}\approx 1.2\times 10^{-10}$m s$^{-2}$ is the accelerationscale of MOND. Such experiments test the degree of generality of theseanomalies, by exploring the same acceleration regime using independentastronomical systems of vastly smaller mass and size. A signal above Newtonianexpectations has been observed when $a \lesssim 2a_{0}$, alternativelyinterpreted as evidence of a modification of gravity, or as due to kinematiccontaminants; undetected stellar components, unbound encounters or spuriousprojection effects. Here I take advantage of the enhanced DR3 {\it Gaia}catalogue to perform a more rigorous study of the internal kinematics of widebinaries than what has previously been possible. Internally determined {\itGaia} stellar masses and estimates of binary probabilities for each star usingspectroscopic information, together with a larger sample of radial velocities,allow for a significant improvement in the analysis and careful exclusion ofpossible kinematic contaminants. Resulting $\Delta V$ scalings accuratelytracing Newtonian expectations for the high acceleration regime, but markedlyinconsistent with these expectations in the low acceleration one, are obtained.A non-Newtonian low acceleration phenomenology is thus confirmed.

Internal kinematics of GAIA DR3 wide binaries: anomalous behaviour in the low acceleration regime