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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"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1308.1411","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-08-06T20:08:48Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"9c035f8dfbdf60aa96e1de25c06ad28b523cf975e947d72b1048da25962bd17c","abstract_canon_sha256":"65387b1b91e82b89f1f102eb22a0d3559b22df255584081a05d362c49808b620"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:22.952564Z","signature_b64":"Lr5FipqBD7Dvs1vGOs5SfjjrBK3fKGKJMIqDfXEWv06tbdPvWBESeVJnJIIh1dXbzjsLpKF1+/282Mnl9bSHCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7cf5ae430b74d1092f9942ae44f0a0cc44aeedee53b0b8012775e78b226c4628","last_reissued_at":"2026-05-18T01:48:22.951924Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:22.951924Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"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. 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