Cosmic radio pulses probe hidden matter around galaxies Caltech NatureAstronomy
thanks Masoud Rafiei-Ravandi and the other, anonymous, reviewer for their contribution to the peer review of this work.Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.Extended Data Fig. 1 A simulation of CHIME/FRB DMs to compare the statistical power and appropriateness of three tests: Student’s one-sided t-test, our jackknife test, and the Kolmogorov-Smirnov test.
We simulate 474 FRB DMs with a similar distribution to the CHIME/FRB sources. In the top row, we have not added any excess DM to the galaxy-intersecting sources. In the bottom row, excess DM has been added to the 25 simulated FRBs that intersect a foreground galaxy, with a normal distribution of mean 150 pc cm. From the top row, we see that none of the tests produces spurious low p-values and their p-values are uniform as expected.
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