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Recently, Thornton and coworkers (2013) confirmed a class of millisecondradio bursts likely of extragalactic origin that is well-suited for estimatingdispersion measures (DMs). We calculate the probability distribution of DM(z)in different models for how the cosmic baryons are distributed (bothanalytically and with cosmological simulations). We show that the distributionof DM is quite sensitive to whether the "missing" baryons lie around the virialradius of 10^11-10^13 Msun halos or further out, which is not easilyconstrained with other observational techniques. The intrinsic contribution toDM from each source could complicate studies of the extragalactic contribution.This difficulty is avoided by stacking based on the impact parameter toforeground galaxies. We show that a stacking analysis using a sample of ~100 DMmeasurements from arcminute-localized, z >~ 0.5 sources would place interestingconstraints at 0.2-2 halo virial radii on the baryonic mass profile surroundingdifferent galaxy types. Conveniently for intergalactic studies, sightlines thatintersect intervening galactic disks should be easily identified owing toscattering. A detectable level of scattering may also result from turbulence inthe circumgalactic medium.

Locating the "missing" baryons with extragalactic dispersion measure estimates