The elusive tidal tails of the Milky Way globular cluster NGC 7099
  We present results on the extra-tidal features of the Milky Way globular
cluster NGC 7099, using deep gr photometry obtained with the Dark Energy Camera
(DECam). We reached nearly 6 mag below the cluster Main Sequence (MS) turnoff,
so that we dealt with the most suitable candidates to trace any stellar
structure located beyond the cluster tidal radius. From star-by-star reddening
corrected color-magnitude diagrams (CMDs) we defined four adjacent strips along
the MS, for which we built the respective stellar density maps, once the
contamination by field stars was properly removed. The resulting field star
cleaned stellar density maps show a short tidal tail and some scattered debris.
Such extra-tidal features are hardly detected when much shallower Gaia DR2 data
sets are used and the same CMD field star cleaning procedure is applied.
Indeed, by using 2.5 magnitudes below the cluster MS turnoff as the faintest
limit (G < 20.5 mag), cluster members turned out to be distributed within the
cluster's tidal radius, and some hints for field star density variations are
found across a circle of radius 3.5deg centered on the cluster and with similar
CMD features as cluster stars. The proper motion distribution of these stars is
distinguishable from that of the cluster, with some superposition, which
resembles that of stars located beyond 3.5deg from the cluster center.
