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The bridge effect of void filaments is a phrase coined by Park & Lee (2009b)to explain the correlations found in a numerical experiment between theluminosity of the void galaxies and the degree of the straightness of theirhost filaments. Their numerical finding implies that a straight void filamentprovides a narrow channel for the efficient transportation of gas and matterparticles from the surroundings into the void galaxies. Analyzing the Sloanvoid catalog constructed by Pan et al (2012), we identify the filamentarystructures in void regions and determine the specific size of each voidfilament as a measure of its straightness. To avoid possible spurious signalscaused by the Malmquist bias, we consider only those void filaments whoseredshifts are in the range of 0=< z <= 0.02 and find a clear tendency that thevoid galaxies located in the more straight filaments are on average moreluminous, which is in qualitative agreement with the numerical prediction. Itis also shown that the strength of correlation increases with the number of themember galaxies of the void filaments, which can be physically understood onthe grounds that the more stretched filaments can connect the densesurroundings even to the galaxies located deep in the central parts of thevoids. This observational evidence may provide a key clue to the puzzling issueof why the void galaxies have higher specific star formation rates and bluercolors than their wall counterparts.

An observational detection of the bridge effect of void filaments