The influence of angular momentum and environment on the HI gas of
  late-type galaxies
  We use high-resolution HI data from the WHISP survey to study the HI and
angular momentum properties of a sample of 114 late-type galaxies. We explore
the specific baryonic angular momentum -- baryonic mass ($j_b - M_b$) relation,
and find that an unbroken power law of the form $j_b \propto M_b^{0.55 \pm
0.02}$ fits the data well, with an intrinsic scatter of $\sim 0.13 \pm 0.01$
dex. We revisit the relation between the atomic gas fraction, $f_{atm}$, and
the integrated atomic stability parameter $q$ (the $f_{atm} - q$ relation),
originally introduced by Obreschkow et al., and probe this parameter space by
populating it with galaxies from different environments, in order to study the
influence of the environment on their $j_b$, $f_{atm}$ and $q$ values. We find
evidence that galaxies with close neighbours show a larger intrinsic scatter
about the $f_{atm} - q$ relation compared to galaxies without close-neighbours.
We also find enhanced SFR among the deviating galaxies with close neighbours.
In addition, we use the bulge-to-total (B/T) ratio as a morphology proxy, and
find a general trend of decreasing B/T values with increasing disc stability
and HI fraction in the $f_{atm} - q$ plane, indicating a fundamental link
between mass, specific angular momentum, gas fraction and morphology of
galaxies.
