The Effect of Local Galaxy Surface Density on Star Formation for HI selected galaxies

We present the result of investigations into two theories to explain the star formation rate (SFR)–density relationship. For regions of high galaxy density, either there are fewer star-forming galaxies or galaxies capable of forming stars are present but some physical process is suppressing their star formation. We use H i Parkes All-Sky Survey's (HIPASS) H i detected galaxies and infrared and rad...