Integral-field kinematics and stellar populations of early-type galaxies
  out to three half-light radii
  We observed twelve nearby HI -detected early-type galaxies (ETGs) of stellar
mass $\sim 10^{10}M\odot \leq M_* \leq \sim 10^{11}M\odot$ with the Mitchell
Integral-Field Spectrograph, reaching approximately three half-light radii in
most cases. We extracted line-of-sight velocity distributions for the stellar
and gaseous components. We find little evidence of transitions in the stellar
kinematics of the galaxies in our sample beyond the central effective radius,
with centrally fast-rotating galaxies remaining fast-rotating and centrally
slow-rotating galaxies likewise remaining slow-rotating. This is consistent
with these galaxies having not experienced late dry major mergers; however,
several of our objects have ionised gas that is misaligned with respect to
their stars, suggesting some kind of past interaction. We extract Lick index
measurements of the commonly-used H$\beta$, Fe5015, Mg\, b, Fe5270 and Fe5335
absorption features, and we find most galaxies to have flat H$\beta$ gradients
and negative Mg, b gradients. We measure gradients of age, metallicity and
abundance ratio for our galaxies using spectral fitting, and for the majority
of our galaxies find negative age and metallicity gradients. We also find the
stellar mass-to-light ratios to decrease with radius for most of the galaxies
in our sample. Our results are consistent with a view in which
intermediate-mass ETGs experience mostly quiet evolutionary histories, but in
which many have experienced some kind of gaseous interaction in recent times.
