Dorado and its member galaxies II. A UVIT picture of the NGC 1533
  substructure
  Dorado is a nearby (17.69 Mpc) strongly evolving galaxy group in the Southern
Hemisphere. We are investigating the star formation in this group. This paper
provides a FUV imaging of NGC 1533, IC 2038 and IC 2039, which form a
substructure, south west of the Dorado group barycentre. FUV CaF2-1
UVIT-Astrosat images enrich our knowledge of the system provided by GALEX. In
conjunction with deep optical wide-field, narrow-band Halpha and 21-cm radio
images we search for signatures of the interaction mechanisms looking in the
FUV morphologies and derive the star formation rate. The shape of the FUV
luminosity profile suggests the presence of a disk in all three galaxies. FUV
emission is detected out to the optical size for IC 2038, and in compact
structures corresponding to Halpha and HII bright features in NGC 1533. A faint
FUV emission, without an optical counterpart, reminiscent of the HI structure
that surrounds the outskirts of NGC 1533 and extends up to IC 2038/2039, is
revealed above the local background noise.
