{"paper":{"title":"X-ray Polarization of the High-Synchrotron-Peaked BL Lac H 1426+428","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Hai-Ming Zhang (GXU), Jia-Xuan Li (BIT), Jin Zhang (BIT), Ji-Shun Lian (BIT), Wei Deng (GXU), Xin-Ke Hu (BIT), Yu-Wei Yu (BIT)","submitted_at":"2025-04-21T05:38:20Z","abstract_excerpt":"We report the X-ray polarization properties of the high-synchrotron-peaked BL Lac H 1426+428, based on two-epoch observational data from the Imaging X-ray Polarimetry Explorer (IXPE). For the first observation, only an upper limit of polarization degree ($\\Pi_{\\rm X}$), $\\Pi_{\\rm X}<19.5\\%$, at the $99\\%$ confidence level (C.L.) is determined. In contrast, for the second observation, we derive $\\Pi_{\\rm X}=20.6\\%\\pm2.9\\%$ with a polarization angle ($\\psi_{\\rm X}$) of $\\psi_{\\rm X}=116.1^{\\circ}\\pm4.1^{\\circ}$ at a C.L. of 7.1 $\\sigma$. The time-resolved and energy-resolved polarization analysi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.14869","kind":"arxiv","version":2},"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/2504.14869/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"}