{"paper":{"title":"X-ray and optical polarization aligned with the radio jet ejecta in GX 339-4","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"A. Ambrifi, A. Manca, A. Marino, A. W. Shaw, B. De Marco, C. Miceli, D. M. Russell, E. Kara, E. V. Lai, F. Capitanio, F. Carotenuto, F. M. Vincentelli, G. Illiano, G. Lodato, G. Mastroserio, I. Mariani, J. Svoboda, J. Wang, K. Alabarta, M. C. Baglio, M. Del Santo, M. Dovciak, P. Casella, P. Saikia, S. Campana, S. Covino, S. Fabiani, S. Motta, T.D. Russell, Y. Cavecchi","submitted_at":"2024-08-09T18:00:02Z","abstract_excerpt":"We present the first X-ray polarization measurements of GX 339-4. IXPE observed this source twice during its 2023-2024 outburst, once in the soft-intermediate state and again during a soft state. The observation taken during the intermediate state shows significant ($4\\sigma$) polarization degree P = $1.3\\% \\pm 0.3\\%$ and polarization angle $\\theta$ = -74\\degree $\\pm$ 7\\degree only in the 3 - 8 keV band. FORS2 at VLT observed the source simultaneously detecting optical polarization in the B, V, R, I bands (between $0.1%$ and $0.7\\%$), all roughly aligned with the X-ray polarization. We also de"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.06856","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2408.06856/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}