Optical spectroscopy of young tidal objects around two interacting
  galaxy pairs
  We present Gemini Multi-Object Spectrograph (GMOS) spectra of HI-rich tidal
features located around the outskirts of two interacting galaxy pairs, NGC
3166/9 and NGC 4725/47. These follow-up observations are part of a
multi-wavelength campaign to study the properties and frequency of tidal dwarf
galaxies (TDGs) in group environments. Based on the calculated gas-phase
metallicity and redshift, in addition to the previously measured HI and stellar
properties, we have confirmed the tidal origins of TDG candidate AGC 208457,
which has emerged from the tidal debris of an interaction between the NGC
3166/9 galaxy pair. By comparing HI and optical recessional velocities, we have
also confirmed a physical association of the gaseous knots and star clusters
embedded in the metal-rich tidal tail of NGC 4747.
