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Post-starburst galaxies, or E+A galaxies, are characterized by opticalspectra showing strong Balmer absorption lines, indicating a young stellarpopulation, and little or no emission lines, implying no active star formation.These galaxies are interpreted as a transitional population betweenstar-forming, disk-dominated galaxies and spheroidal quiescent, non-starforming galaxies. Here, we present single dish HI 21-cm emission linemeasurements of a sample of eleven of these galaxies at redshifts z<0.05. Wedetect H I emission in six of the E+A galaxies. In combination with earlierstudies, the total number of E+A galaxies with measured cold gas components isnow eleven. Roughly half of the E+As studied so far have detectable HI. The gasfractions of these galaxies, measured with respect to their stellar mass, arebetween 1 and 10 percent and are at the high end of the gas fractions measuredin gas-bearing early type galaxies and typically lower than seen in late-typegalaxies with comparable stellar masses. This finding is consistent with theidea that E+As are currently evolving from the blue cloud to the red sequence.However, the question of why the star formation has ceased in these galaxieswhile a significant gas reservoir is still present can only be answered byhigher spatial resolution observations of the cold gas.

The cold gas content of post-starburst galaxies