Dynamical modelling of the twisted galaxy PGC 046832

We analyse VLT/MUSE observations of PGC 046832, the brightest cluster galaxy Abell 3556. The velocity structure this is startling and shows two reversals in sign along minor axis, one major axis. use triaxial Schwarzschild models to infer intrinsic shape, central black hole mass orbit distribution galaxy. shape determination suggests that highly centre (almost prolate) but has a low triaxiality oblate) outer parts. best-fit model kinematic reversal projected axis driven by slight asymmetry amount long tubes inner are high fraction counter-rotating orbits at intermediate radii Using chemical tagging model, we do not find evidence for any association these with specific stellar population parameters. Although part almost certainty formed through or more dry mergers producing prolate parts consistent both accretion situ formation. While axisymmetric presence supermassive $\sim 6 \times 10^9$M$_{\odot}$ 10^{10}$M$_{\odot}$ (with Jeans modelling, resp), provide only an upper limit 2 10^9$M$_{\odot}$.