Rotating stellar populations in the Fornax dSph galaxy
  We present a novel analysis of the internal kinematics of the Fornax dwarf
spheroidal galaxy. Our results are based on the largest sample of spectroscopic
data for Fornax stars presently available ($> 2500$ stars), for which we have
chemical and kinematic information. We introduce new software, Beacon, designed
to detect chemo-kinematic patterns among stars of different stellar populations
using their metallicity and velocity along the line of sight. Applying Beacon
to Fornax we have detected non-negligible rotation signals around main optical
axes of the galaxy, characteristic for a triaxial system partially supported by
rotation. The dominant rotation pattern is relatively strong ($\sim 12$ km
s$^{-1}$), but the galaxy also shows additional weaker albeit complex rotation
patterns. Using the information available from the star formation history of
Fornax we have also derived the average age of the different chemo-kinematic
components found by Beacon, which has allowed us to obtain its kinematic
history. Our results point to a possible major merger suffered by Fornax at
redshift $z\sim1$, in agreement with previous works.
