The SLUGGS Survey: stellar kinematics, kinemetry and trends at large
  radii in 25 early-type galaxies
  Due to longer dynamical timescales, the outskirts of early-type galaxies
retain the footprint of their formation and assembly. Under the popular
two-phase galaxy formation scenario, an initial in-situ phase of star formation
is followed by minor merging and accretion of ex-situ stars leading to the
expectation of observable transitions in the kinematics and stellar populations
on large scales. However, observing the faint galactic outskirts is
challenging, often leaving the transition unexplored. The large scale,
spatially-resolved stellar kinematic data from the SAGES Legacy Unifying
Galaxies and GlobularS (SLUGGS) survey are ideal for detecting kinematic
transitions. We present kinematic maps out to 2.6 effective radii on average,
kinemetry profiles, measurement of kinematic twists and misalignments, and the
average outer intrinsic shape of 25 SLUGGS galaxies. We find good overall
agreement in the kinematic maps and kinemetry radial profiles with literature.
We are able to confirm significant radial modulations in rotational versus
pressure support of galaxies with radius so that the central and outer
rotational properties may be quite different. We also test the suggestion that
galaxies may be more triaxial in their outskirts and find that while fast
rotating galaxies were already shown to be axisymmetric in their inner regions,
we are unable to rule out triaxiality in their outskirts. We compare our
derived outer kinematic information to model predictions from a two-phase
galaxy formation scenario. We find that the theoretical range of local outer
angular momentum agrees well with our observations, but that radial modulations
are much smaller than predicted.
