Made-to-measure galaxy modelling utilising absorption line strength data
  We enhance the Syer & Tremaine made-to-measure (M2M) particle method of
stellar dynamical modelling to model simultaneously both kinematic data and
absorption line strength data thus creating a `chemo-M2M' modelling scheme. We
apply the enhanced method to four galaxies (NGC 1248, NGC 3838, NGC 4452, NGC
4551) observed using the SAURON integral-field spectrograph as part of the
ATLAS3D programme. We are able to reproduce successfully the 2D line strength
data achieving mean chi^2 per bin values of ~1 with >95\% of particles having
converged weights. Because M2M uses a 3D particle system, we are also able to
examine the underlying 3D line strength distributions. The extent to which
these distributions are plausible representations of real galaxies requires
further consideration. Overall we consider the modelling exercise to be a
promising first step in developing a `chemo-M2M' modelling system and in
understanding some of the issues to be addressed. Whilst the made-to-measure
techniques developed have been applied to absorption line strength data, they
are in fact general and may be of value in modelling other aspects of galaxies.
