{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:USE62G24AI2VAR7CLQLLEYIS6W","short_pith_number":"pith:USE62G24","schema_version":"1.0","canonical_sha256":"a489ed1b5c02355047e25c16b26112f59ec89c529a17448ae6d06f59ba912e84","source":{"kind":"arxiv","id":"1908.04246","version":3},"attestation_state":"computed","paper":{"title":"The shapes of spiral arms in the S$^4$G survey and their connection with stellar bars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Heikki Salo, Johan H. Knapen, Mart\\'in Herrera-Endoqui, Sim\\'on D\\'iaz-Garc\\'ia","submitted_at":"2019-08-12T16:53:49Z","abstract_excerpt":"Spiral galaxies are common in the local Universe, but their formation, evolution, and interplay with bars remain poorly understood. We use a sample of 391 nearby galaxies from the S$^4$G survey to characterise the winding angle and amplitude of spiral arms as a function of disc properties, such as bar strength, in all kinds of spirals (grand-design, multi-armed, and flocculent). We derive global pitch angles in 3.6 $\\mu$m de-projected images from i) average measurements of individual logarithmic spiral segments, and ii) for a subsample of 32 galaxies, from 2-D Fourier analyses. The strength of"},"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":"1908.04246","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-08-12T16:53:49Z","cross_cats_sorted":[],"title_canon_sha256":"0ea907afa8882239ab31597207d54981f8f5715cb711fc46a65c6059af723f6a","abstract_canon_sha256":"bb755ad85fd17cd101af38136d16ae27f810c7d812d77e819fd3325ddda7d21b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:15:39.823308Z","signature_b64":"gGwDunTMccf+b8VdM4yjCAKpkcM1adMw+tqfirLRfXXVWcaz5Mz5c7X0OnZVWOVLRg7B0zQ7uiaO/mPyEpeKDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a489ed1b5c02355047e25c16b26112f59ec89c529a17448ae6d06f59ba912e84","last_reissued_at":"2026-07-05T00:15:39.822777Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:15:39.822777Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The shapes of spiral arms in the S$^4$G survey and their connection with stellar bars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Heikki Salo, Johan H. Knapen, Mart\\'in Herrera-Endoqui, Sim\\'on D\\'iaz-Garc\\'ia","submitted_at":"2019-08-12T16:53:49Z","abstract_excerpt":"Spiral galaxies are common in the local Universe, but their formation, evolution, and interplay with bars remain poorly understood. We use a sample of 391 nearby galaxies from the S$^4$G survey to characterise the winding angle and amplitude of spiral arms as a function of disc properties, such as bar strength, in all kinds of spirals (grand-design, multi-armed, and flocculent). We derive global pitch angles in 3.6 $\\mu$m de-projected images from i) average measurements of individual logarithmic spiral segments, and ii) for a subsample of 32 galaxies, from 2-D Fourier analyses. The strength of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.04246","kind":"arxiv","version":3},"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/1908.04246/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1908.04246","created_at":"2026-07-05T00:15:39.822838+00:00"},{"alias_kind":"arxiv_version","alias_value":"1908.04246v3","created_at":"2026-07-05T00:15:39.822838+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.04246","created_at":"2026-07-05T00:15:39.822838+00:00"},{"alias_kind":"pith_short_12","alias_value":"USE62G24AI2V","created_at":"2026-07-05T00:15:39.822838+00:00"},{"alias_kind":"pith_short_16","alias_value":"USE62G24AI2VAR7C","created_at":"2026-07-05T00:15:39.822838+00:00"},{"alias_kind":"pith_short_8","alias_value":"USE62G24","created_at":"2026-07-05T00:15:39.822838+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W","json":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W.json","graph_json":"https://pith.science/api/pith-number/USE62G24AI2VAR7CLQLLEYIS6W/graph.json","events_json":"https://pith.science/api/pith-number/USE62G24AI2VAR7CLQLLEYIS6W/events.json","paper":"https://pith.science/paper/USE62G24"},"agent_actions":{"view_html":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W","download_json":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W.json","view_paper":"https://pith.science/paper/USE62G24","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1908.04246&json=true","fetch_graph":"https://pith.science/api/pith-number/USE62G24AI2VAR7CLQLLEYIS6W/graph.json","fetch_events":"https://pith.science/api/pith-number/USE62G24AI2VAR7CLQLLEYIS6W/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W/action/timestamp_anchor","attest_storage":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W/action/storage_attestation","attest_author":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W/action/author_attestation","sign_citation":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W/action/citation_signature","submit_replication":"https://pith.science/pith/USE62G24AI2VAR7CLQLLEYIS6W/action/replication_record"}},"created_at":"2026-07-05T00:15:39.822838+00:00","updated_at":"2026-07-05T00:15:39.822838+00:00"}