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Faraday rotation measures (RMs) of fast radio bursts (FRBs) offer theprospect of directly measuring extragalactic magnetic fields. We present ananalysis of the RMs of ten as yet non-repeating FRBs detected and localized tohost galaxies by the 110-antenna Deep Synoptic Array (DSA-110). We combine thissample with published RMs of 15 localized FRBs, nine of which are repeatingsources. For each FRB in the combined sample, we estimate the host-galaxydispersion measure (DM) contributions and extragalactic RM. We find compellingevidence that the extragalactic components of FRB RMs are often dominated bycontributions from the host-galaxy interstellar medium (ISM). Specifically, wefind that both repeating and as yet non-repeating FRBs show a correlationbetween the host-DM and host-RM in the rest frame, and we find ananti-correlation between extragalactic RM (in the observer frame) and redshiftfor non-repeaters, as expected if the magnetized plasma is in the host galaxy.Important exceptions to the ISM origin include a dense, magnetized circum-burstmedium in some repeating FRBs, and the intra-cluster medium (ICM) of host orintervening galaxy clusters. We find that the estimated ISM magnetic-fieldstrengths, $\bar{B}_{||}$, are characteristically larger than those inferredfrom Galactic radio pulsars. This suggests either increased ISM magnetizationin FRB hosts in comparison with the Milky Way, or that FRBs preferentiallyreside in regions of increased magnetic-field strength within their hosts.

Deep Synoptic Array Science: Implications of Faraday Rotation Measures of Localized Fast Radio Bursts