Studying the radio continuum from nuclear activity and star formation in
  Giant Low Surface Brightness Galaxies
  We present a multifrequency radio continuum study of seven giant low surface
brightness (GLSB) galaxies using the Giant Metrewave Radio Telescope (GMRT).
GLSB galaxies are optically faint, dark-matter dominated systems that are
poorly evolved and have large HI gas disks. Our sample consists of GLSB
galaxies that show signatures of nuclear activity in their optical spectra. We
detect radio emission from the nuclei of all the seven galaxies. Five galaxies
have nuclear spectral indices that range from 0.12 to -0.44 and appear to be
core-dominated; the two galaxies have a steeper spectrum. Two of the galaxies,
UGC 2936 and UGC 4422 show significant radio emission from their disks. In our
610 MHz observations of UGC 6614, we detect radio lobes associated with the
radio-loud active galactic nucleus (AGN). The lobes have a spectral index of
-1.06+/-0.12. The star formation rates estimated from the radio emission, for
the entire sample range from 0.15 to 3.6 M{solar} yr^{-1} . We compare the
radio images with the near-ultraviolet (NUV) images from GALEX and
near-infrared (NIR) images from 2MASS. The galaxies present a diversity of
relative NUV, NIR and radio emission, supporting an episodic star formation
scenario for these galaxies. Four galaxies are classified members of groups and
one is classified as isolated. Our multiwavlength study of this sample suggests
that the environment plays an important role in the evolution of these
galaxies.
