Infrared dust bubble CS51 and its interaction with the surrounding
  interstellar medium
  A multiwavelength investigation of the southern infrared dust bubble CS51 is
presented in this paper. We probe the associated ionized, cold dust, molecular
and stellar components. Radio continuum emission mapped at 610 and 1300 MHz,
using the Giant Metrewave Radio Telescope, India, reveal the presence of three
compact emission components (A, B, and C) apart from large-scale diffuse
emission within the bubble interior. Radio spectral index map show the
coexistence of thermal and non-thermal emission components. Modified blackbody
fits to the thermal dust emission using Herschel PACS and SPIRE data is
performed to generate dust temperature and column density maps. We identify
five dust clumps associated with CS51 with masses and radius in the range 810 -
4600 M{\sun} and 1.0 - 1.9 pc, respectively. We further construct the column
density probability distribution functions of the surrounding cold dust which
display the impact of ionization feedback from high-mass stars. The estimated
dynamical and fragmentation timescales indicate the possibility of collect and
collapse mechanism in play at the bubble border. Molecular line emission from
the MALT90 survey is used to understand the nature of two clumps which show
signatures of expansion of CS51.
