The HI Structure of the Local Volume Dwarf Galaxy Pisces A
  Dedicated HI surveys have recently led to a growing category of low-mass
galaxies found in the Local Volume. We present synthesis imaging of one such
galaxy, Pisces A, a low-mass dwarf originally confirmed via optical imaging and
spectroscopy of neutral hydrogen (HI) sources in the Galactic Arecibo L-band
Feed Array HI (GALFA-HI) survey. Using HI observations taken with the Karl G.
Jansky Very Large Array (JVLA), we characterize the kinematic structure of the
gas and connect it to the galaxy's environment and evolutionary history. While
the galaxy shows overall ordered rotation, a number of kinematic features
indicate a disturbed gas morphology. These features are suggestive of a
tumultuous recent history, and represent $\sim 3.5$% of the total baryonic
mass. We find a total baryon fraction $f_{\rm bary} = 0.13$ if we include these
features. We also quantify the cosmic environment of Pisces A, finding an
apparent alignment of the disturbed gas with nearby, large scale filamentary
structure at the edge of the Local Void. We consider several scenarios for the
origin of the disturbed gas, including gas stripping via ram pressure or
galaxy-galaxy interactions, as well as accretion and ram pressure compression.
Though we cannot rule out a past interaction with a companion, our observations
best support the suggestion that the neutral gas morphology and recent star
formation in Pisces A is a direct result of its interactions with the IGM.
