{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"fa38df8b28a15409a4c80eb2eac4c7176565f2a8ab9bd230bbffd32d1f8782da","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"2420ca6d35d81fc9b21c1fcd4e6097b80bf05a03cc69e0349edb0565c2b0a23f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"astro.accretion-jet-launching.bz-spin-jet-power","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Theory predicts that magnetic fields threading a spinning black hole extract its rotational energy into jets, so faster-spinning holes should have stronger jets.","posed_since":"1977","precise":"Test the Blandford-Znajek scaling $P_{\\mathrm{jet}} = (\\kappa/(4 \\pi c)) \\Phi_{\\mathrm{BH}}^2 \\Omega_H^2$ (Gaussian units; $\\Phi_{\\mathrm{BH}}$ the magnetic flux through the horizon, $\\Omega_H$ the horizon angular frequency, $\\kappa \\sim 0.05$) against measured spins and jet powers in X-ray binaries and AGN. Answer: a demonstrated correlation, or its absence, of jet power with spin at fixed flux and accretion rate, using spins from independent methods.","problem_ref":null,"references":"","settled_by":"A sample of black holes with spins measured by two independent methods and jet powers from calorimetry, showing or excluding the predicted $\\Omega_{\\mathrm{H}}^2$ dependence.","status_note":"Proposed spin-jet power correlations in X-ray binaries (2012) were disputed; Event Horizon Telescope polarimetric images of M87* (2021) favor magnetically arrested accretion consistent with spin-powered jets but do not measure spin.","title":"Is jet power set by black hole spin via 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