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Due to longer dynamical timescales, the outskirts of early-type galaxiesretain the footprint of their formation and assembly. Under the populartwo-phase galaxy formation scenario, an initial in-situ phase of star formationis followed by minor merging and accretion of ex-situ stars leading to theexpectation of observable transitions in the kinematics and stellar populationson large scales. However, observing the faint galactic outskirts ischallenging, often leaving the transition unexplored. The large scale,spatially-resolved stellar kinematic data from the SAGES Legacy UnifyingGalaxies and GlobularS (SLUGGS) survey are ideal for detecting kinematictransitions. We present kinematic maps out to 2.6 effective radii on average,kinemetry profiles, measurement of kinematic twists and misalignments, and theaverage outer intrinsic shape of 25 SLUGGS galaxies. We find good overallagreement in the kinematic maps and kinemetry radial profiles with literature.We are able to confirm significant radial modulations in rotational versuspressure support of galaxies with radius so that the central and outerrotational properties may be quite different. We also test the suggestion thatgalaxies may be more triaxial in their outskirts and find that while fastrotating galaxies were already shown to be axisymmetric in their inner regions,we are unable to rule out triaxiality in their outskirts. We compare ourderived outer kinematic information to model predictions from a two-phasegalaxy formation scenario. We find that the theoretical range of local outerangular momentum agrees well with our observations, but that radial modulationsare much smaller than predicted.

The SLUGGS Survey: stellar kinematics, kinemetry and trends at large radii in 25 early-type galaxies