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Two dwarf irregular galaxies DDO 187 and NGC 3738 exhibit a striking patternof star formation: intense star formation is taking place in a large regionoccupying roughly half of the inner part of the optical galaxy. We use data onthe HI distribution and kinematics and stellar images and colors to examine theproperties of the environment in the high star formation rate (HSF) halves ofthe galaxies in comparison with the low star formation rate (LSF) halves. Wefind that the pressure and gas density are higher on the HSF sides by 30-70%.In addition we find in both galaxies that the HI velocity fields exhibitsignificant deviations from ordered rotation and there are large regions ofhigh velocity dispersion and multiple velocity components in the gas beyond theinner regions of the galaxies. The conditions in the HSF regions are likely theresult of large-scale external processes affecting the internal environment ofthe galaxies and enabling the current star formation there.

A study of two dwarf irregular galaxies with asymmetrical star formation distributions