{"paper":{"title":"Innermost collimation structure of the M87 jet down to ~ten Schwarzschild radii","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.CO","authors_text":"Akihiro Doi, Gabriele Giovannini, Hiroshi Nagai, Kazuhiro Hada, Marcello Giroletti, Mareki Honma, Motoki Kino, Noriyuki Kawaguchi, Yoshiaki Hagiwara","submitted_at":"2013-08-06T20:08:48Z","abstract_excerpt":"We investigated the detailed inner jet structure of M87 using the Very Long Baseline Array data at 2, 5, 8.4, 15, 23.8, 43, and 86 GHz, especially focusing on the multi-frequency properties of the radio core at the jet base. First, we measured a size of the core region transverse to the jet axis, defined as $W_{\\rm c}$, at each frequency \\nu, and found a relation between $W_{\\rm c}$ and $\\nu$ as $W_{\\rm c}(\\nu) \\propto \\nu^{-0.71\\pm0.05}$. Then, by combining $W_{\\rm c}(\\nu)$ and the frequency dependence of the core position $r_{\\rm c}(\\nu)$, which was obtained by our previous study, we have co"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.1411","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":""},"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"}