HI asymmetries in the isolated galaxy CIG 292
  We present Expanded Very Large Array (EVLA) D-array observations in the 21-cm
line of neutral hydrogen (HI) of CIG 292, an isolated SA(s)b galaxy at a
distance of ~ 24.3Mpc. From previous HI single dish observations the galaxy was
known to have a mildly asymmetric HI profile (A_flux =1.23 {\pm}0.3). Our EVLA
observations show there is ~ 12% more HI projected South of the optical centre
(approaching velocities) than in the North (receding velocities), despite the
HI extending ~ 16% further to the North than the South. The HI projected within
the optical disk must have been perturbed within the HI relaxation time (~ 10^8
yr) which implies that this can not have been caused by any of the three
nearest companions, as their distance (~ 0.5Mpc) is too large. Neither HI-rich
companions nor tidal tails were found within our field of view and velocity
range covered. Our kinematical data suggest that the inner part harbors an oval
distortion whereas the outer regions show signs of a modest warp. The mild
asymmetry in the HI global profile thus actually masks stronger asymmetries in
the two-dimensional distributions of gas and star forming regions in this
galaxy. Since the galaxy is isolated, this must predominantly be due to
processes related to its formation and secular evolution.
