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We present results from a narrow-band survey of the field around the highredshift radio galaxy MRC 2104-242. We have selected Halpha emitters in a7sq.arcmin field and compared the measured number density with that of a fieldsample at similar redshift. We find that MRC 2104-242 lies in an overdensity ofgalaxies that is 8.0 +/- 0.8 times the average density of a blank field,suggesting it resides in a large-scale structure that may eventually collapseto form a massive cluster. We find that there is more dust obscured starformation in the protocluster galaxies than in similarly selected control fieldgalaxies and there is tentative evidence of a higher fraction of starburstinggalaxies in the denser environment. However, on average we do not find adifference between the star formation rate (SFR)-mass relations of theprotocluster and field galaxies and so conclude that the SFR of these galaxiesat z~2.5 is governed predominantly by galaxy mass and not the host environment.We also find that the stellar mass distribution of the protocluster galaxies isskewed towards higher masses and there is a significant lack of galaxies at M <10^10Msun within our small field of view. Based on the level of overdensity weexpect to find ~22 star forming galaxies below 10^10Msun in the protoclusterand do not detect any. This lack of low mass galaxies affects the level ofoverdensity which we detect. If we only consider high mass (M > 10^10.5Msun)galaxies, the density of the protocluster field increases to ~55 times thecontrol field density.

A z=2.5 protocluster associated with the radio galaxy MRC 2104-242: star formation and differing mass functions in dense environments