While major mergers and their tidal debris are well studied, equal mass
galaxy mergers are relatively rare compared to minor mergers (mass ratio
<0.3).
Minor mergers are less energetic than major mergers, but more common in the
observable universe, and thus likely played a pivotal role in the formation
of most large galaxies. Tidal debris regions have large amounts of neutral
gas but a lower gas density and may have higher turbulence. We use star
formation tracers such as young star cluster populations and H-alpha and
CII emission to determine the different factors that may influence star
formation in tidal debris. These tracers were compared to the reservoirs
of molecular and neutral gas available for star formation to estimate the
star formation efficiency (SFE). The SFR in tidal debris can reach up to
50% of the total star formation in the system. The SFE of tidal tails in
minor mergers can range over orders of magnitude on both local and global
scales. From the tidal debris environments in our study, this variance
appears to stem from the formation conditions of the debris. Current
surveys of the 2.12 micron line of molecular hydrogen, CO(1-0), and HI for
15 minor mergers, are providing a larger sample of environments to study
the threshold for star formation that can inform star formation models,
particularly at low densities.