{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"70efb1e4b29dd9861d6e4c06a57552ecb03d725abe77296ccf2ae31732395464","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","ede50e876fd5635cf02e228e1c2a93b861c5df0b3ad8b77629bd310e93b7b956"],"salt":"d1af0891616b091be55476e403d836a2fa377b48c5b3eca62cd158b10d6727d5","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":"2","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 $\\sim 10^{29}\\,\\mathrm{erg}\\,\\mathrm{s}^{-1}\\,\\mathrm{Hz}^{-1}$, size below $\\sim 1\\,\\mathrm{pc}$) and show rotation measures up to $\\sim 10^{5}\\,\\mathrm{rad}\\,\\mathrm{m}^{-2}$ 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":"ede50e876fd5635cf02e228e1c2a93b861c5df0b3ad8b77629bd310e93b7b956","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 FRBs?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"6e2855583ccad78540985043b7b7108b8539e7ac5955f68febf1a2672a941a6f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"81c31d0a03054ea76eb13c899e88f22c87001a35caf538adfd496a8ccbec3bc7","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"j7KTjggsF16MAaUluN-aJ2wR4gy8DuVCPGbv6hqdz0N0T-4PiFsPXqIMelNxRQep7M_oqhcfoHMNUKcJj6CKCg"},"schema":"pubphys.envelope/1"},"record_hash":"6e2855583ccad78540985043b7b7108b8539e7ac5955f68febf1a2672a941a6f","leaf_index":2348}