{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"9b6cc17820c1098102f8bdfe14232e81428086c3ed9a4532c968b554a5c0a832","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"54f62b2d3ead51d9474c2b9889726ec482baca24293bcea86a44599162ad1f34","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.fast-radio-bursts.persistent-radio-sources","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"A few repeating FRB sources lie inside a compact, steady radio glow and very strongly magnetized gas, which could be a nebula inflated by a young magnetar or the outflow of an accreting black hole.","posed_since":"2017","precise":"FRB 20121102A and FRB 20190520B are co-located with compact persistent radio sources (spectral luminosity $\\sim 1e29\\,\\mathrm{erg}\\,\\mathrm{s}^{-1}\\,\\mathrm{Hz}^{-1}$, size below $\\sim 1\\,\\mathrm{pc}$) and show rotation measures up to $\\sim 1e5\\,\\mathrm{rad}\\,\\mathrm{m}^{-2}$ that change by tens of percent over years. Determine whether these sources are magnetar wind nebulae, nebulae inflated by hyper-accreting compact binaries, or accreting intermediate-mass or massive black holes, and test the predicted relation between persistent-source luminosity and $\\mid \\mathrm{RM} \\mid$. Answer: an identification whose predicted decline of persistent flux and RM over decades matches monitoring.","problem_ref":null,"references":"","settled_by":"Decade-long monitoring of persistent-source flux, size and RM for several repeaters, compared with the evolution predicted by each model.","status_note":"2024: a persistent radio source was reported for FRB 20201124A, a third repeater with this feature.","title":"What powers the persistent radio sources around some repeating 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