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Tidal Dwarf Galaxies (TDGs), produced from material expelled in galacticinteractions, are well--suited to test the laws of star formation (SF) due totheir simple structure, high metallicity -- making CO a reliable tracer of themolecular gas content -- and recent SF. Here, we study the conditions for theonset of SF and for the rate at which SF proceeds once above a threshold in asmall sample of TDGs. We use data for the gas (atomic and molecular) surfacedensity and SF rate per area to test the laws of SF found for spiral and dwarfgalaxies in this more extreme environment. We find in general a good agreementwith the Schmidt law found for the total gas and for the molecular gas but notethat higher resolution CO observations are necessary to clarify some possiblediscrepancies. We find, down to a scale of $\sim$1 kpc, in general a goodagreement between the peaks of SF and of the molecular gas, but also find insome objects surprisingly large quantities of molecular gas at places where noSF is occuring. A high column density of molecular gas is therefore not asufficient condition for the onset of SF. We find that the kinematicalproperties of the gas are also relevant: in two objects our observations showedthat SF only occured in regions with a narrow line width.

Molecular gas in Tidal Dwarf Galaxies: Exploring the conditions for star formation