There's so much we don't know about fast radio bursts and galactic halos. Combined, we get a unique window on the Universe.
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possesses, the probabilities of having a random association within one arc-second of another galaxy can be computed. Typical odds of such an association range between 0.25% and 0.40%, with the median value of 0.31%: about 1-in-300 odds. We've clearly gotten lucky, as humanity has not yet detected anywhere near 300 FRBs in total.With incredibly large distances for FRBs to traverse, each one risks passing through an intervening galaxy....
looking at absorption features from distant quasars, whose light either did or did not pass through the halo surrounding Andromeda. Where the halo is present, its gas absorbs some of the quasar light and darkens it across a very small wavelength range. By measuring the tiny dip in brightness at that specific range, scientists could tell how much gas is between us and each quasar. Doing this for more distant galaxies requires not only alternative techniques, but also serendipitous alignments.
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