{"paper":{"title":"Cosmic Dispersion Measure from Gamma-Ray Burst Afterglows: Probing the Reionization History and the Burst Environment","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Kunihito Ioka","submitted_at":"2003-09-06T10:04:00Z","abstract_excerpt":"We show a possible way to measure the column density of free electrons along the light path, the so-called Dispersion Measure (DM), from the early $[\\sim 415 (\\nu/1 {\\rm GHz})^{-2} ({\\rm DM}/10^{5} {\\rm pc} {\\rm cm}^{-3}) {\\rm s}]$ radio afterglows of the gamma-ray bursts. We find that the proposed Square Kilometer Array can detect bright radio afterglows around the time $\\sim 10^{3}(\\nu/160 {\\rm MHz})^{-2}$ s to measure the intergalactic DM ($\\simg 6000$ pc cm$^{-3}$ at redshift $z>6$) up to $z\\sim 30$, from which we can determine the reionization history of the universe and identify the miss"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0309200","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/astro-ph/0309200/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"}