What perturbs NGC2188?

VLA HI observations of the dwarf irregular galaxy NGC2188 show that the gas and stars have spatial distributions which are substantially different. One end of the optical disk is strongly gas deficient, while neutral gas extends into the halo over distances of more than 2kpc from the midplane. This and the peculiar velocity field suggest that NGC2188 is a perturbed system, although it is not obviously an interacting galaxy. In addition, NGC2188 is remarkable for its interstellar disk-halo connection. An Hα image of NGC2188 shows the presence of spectacular features of ionized gas extending from a large star-forming complex up to 500pc into the halo. Also, peculiar HI filaments and at least one superbubble are present in NGC2188.