Signatures of tidal disruption in the Milky Way globular cluster NGC
  6981 (M72)
  We study the outer regions of the Milky Way globular cluster NGC6981 from
publicly available $BV$ photometry and new Dark Energy Camera (DECam)
observations, both reaching nearly 4 mag below the cluster main sequence (MS)
turnoff. While the $BV$ data sets reveal the present of extra-tidal features
around the cluster, the much larger field of view of DECam observations allowed
us to identify some other tidal features, which extend from the cluster toward
the opposite direction to the Milky Way center. These cluster structural
features arise from stellar density maps built using MS stars, once the cluster
color-magnitude diagram was cleaned from the contamination of field stars. We
also performed $N$-body simulations in order to help us to understand the
spatial distribution of the extra-tidal debris. The outcomes reveal the
presenceof long trailing and leading tails mostly parallel to the direction of
the cluster velocity vector. We found that the cluster has lost most of its
mass by tidal disruption during its perigalactic passages, that lasted nearly
20 Myr each. Hence, a decrease in the density of escaping stars near the
cluster is expected from our $N$-body simulations, which in turn means that
stronger extra-tidal features could be found out by exploring much larger areas
around NGC6891.
