A Dearth of Atomic Hydrogen in NGC1052-DF2
  The recently claimed discovery of an ultra-diffuse galaxy lacking dark matter
has important implications for alternate theories to dark matter as well as
models of galaxy formation within the $\Lambda$CDM context. In this letter, we
present a deep Giant Metrewave Radio Telescope (GMRT) search for atomic
hydrogen in this ultra-diffuse galaxy, NGC1052-DF2. We report a non-detection
of the HI21cm transition from the galaxy and place a stringent upper-limit on
the HI mass of the galaxy - $M_{HI} < 3.15 \times 10^6 \ ({\Delta V}/20 \
\textrm{km/s})^{1/2} \ M_\odot \ (3\sigma)$. This makes NGC1052-DF2 an
extremely gas poor galaxy with an atomic gas to stellar mass fraction of
$M_{HI}/M_* \ < \ 0.016 \ ({\Delta V}/20 \ \textrm{km/s})^{1/2} \ (3\sigma)$.
Such low gas fractions are typical of dwarf ellipticals in dense environments
and would be consistent with NGC1052-DF2 having undergone a tidal stripping
event which can also explain its apparent lack of dark matter.
