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The H I Mass Function: Open Questions

Characterizing the population of extragalactic H I sources by their H I mass is an important step toward understanding how galaxies have evolved. If there is one conclusion to draw from past attempts at defining the H I mass function (HIMF) and the longer history of defining the galaxy luminosity function, it is that we will not converge on a single answer anytime soon. Part of this is because there is almost certainly not a single universal HIMF, and one of the primary open questions for current and future surveys is how parameters such as local density affect it.