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We have observed 10 interacting galaxy pairs using the Fabry-Perotinterferometer GH$\alpha$FaS (Galaxy H$\alpha$ Fabry-Perot system) on the$4.2\rm{m}$ William Herschel Telescope (WHT) at the Observatorio del Roque delos Muchachos, La Palma. We present here the H$\alpha$ surface brightness,velocity and velocity dispersion maps for the 10 systems we have not previouslyobserved using this technique, as well as the physical properties (sizes,H$\alpha$ luminosities and velocity dispersion) of 1259 HII regions from thefull sample. We also derive the physical properties of 1054 HII regions in asample of 28 isolated galaxies observed with the same instrument in order tocompare the two populations of HII regions. We find a population of thebrightest HII regions for which the scaling relations, for example the relationbetween the H$\alpha$ luminosity and the radius, are clearly distinct from therelations for the regions of lower luminosity. The regions in this brightpopulation are more frequent in the interacting galaxies. We find that theturbulence, and also the star formation rate, are enhanced in the HII regionsin the interacting galaxies. We have also extracted the H$\alpha$ equivalentwidths for the HII regions of both samples, and we have found that thedistribution of HII region ages coincides for the two samples of galaxies. Wesuggest that the SFR enhancement is brought about by gas flows induced by theinteractions, which give rise to gravitationally bound gas clouds which growfurther by accretion from the flowing gas, producing conditions favourable tostar formation.

Comparative internal kinematics of the HII regions in interacting and isolated galaxies: implications for massive star formation modes