{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:ZN2PYD662LA2LNPQNYRC4OPNYV","short_pith_number":"pith:ZN2PYD66","schema_version":"1.0","canonical_sha256":"cb74fc0fded2c1a5b5f06e222e39edc544d529deabc5ac7d0c619273a97c22df","source":{"kind":"arxiv","id":"1907.09791","version":1},"attestation_state":"computed","paper":{"title":"A galaxy classification grid that better recognises early-type galaxy morphology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alister W. Graham","submitted_at":"2019-07-23T09:53:38Z","abstract_excerpt":"A modified galaxy classification scheme for local galaxies is presented. It builds upon the Aitken-Jeans nebula sequence, by expanding the Jeans-Hubble tuning fork diagram, which itself contained key ingredients from Curtis and Reynolds. The two-dimensional grid of galaxy morphological types presented here, with elements from de Vaucouleurs' three-dimensional classification volume, has an increased emphasis on the often overlooked bars and continua of disc sizes in early-type galaxies - features not fully captured by past tuning forks, tridents, or combs. The grid encompasses nuclear discs in "},"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":"1907.09791","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-07-23T09:53:38Z","cross_cats_sorted":[],"title_canon_sha256":"83eec21bc0e5c75bfb0b2abba268db9004abec0c7f74ecce511cf9698b033d1b","abstract_canon_sha256":"6280d984546c3be51312691d12c829b85bc78cc3b198d2f26f083ef2f6e9fa66"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:39:50.025233Z","signature_b64":"o8ncLfk7blsIEb+pRC+A3zmN8bLh2ZDLRX7EE5s9mf6HzRLS3wIbi7SQC27H3PL/PUmA0dZXIz1TBLKBeaIzAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cb74fc0fded2c1a5b5f06e222e39edc544d529deabc5ac7d0c619273a97c22df","last_reissued_at":"2026-05-17T23:39:50.024677Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:39:50.024677Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A galaxy classification grid that better recognises early-type galaxy morphology","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alister W. Graham","submitted_at":"2019-07-23T09:53:38Z","abstract_excerpt":"A modified galaxy classification scheme for local galaxies is presented. It builds upon the Aitken-Jeans nebula sequence, by expanding the Jeans-Hubble tuning fork diagram, which itself contained key ingredients from Curtis and Reynolds. The two-dimensional grid of galaxy morphological types presented here, with elements from de Vaucouleurs' three-dimensional classification volume, has an increased emphasis on the often overlooked bars and continua of disc sizes in early-type galaxies - features not fully captured by past tuning forks, tridents, or combs. The grid encompasses nuclear discs in "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.09791","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1907.09791","created_at":"2026-05-17T23:39:50.024771+00:00"},{"alias_kind":"arxiv_version","alias_value":"1907.09791v1","created_at":"2026-05-17T23:39:50.024771+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.09791","created_at":"2026-05-17T23:39:50.024771+00:00"},{"alias_kind":"pith_short_12","alias_value":"ZN2PYD662LA2","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_16","alias_value":"ZN2PYD662LA2LNPQ","created_at":"2026-05-18T12:33:33.725879+00:00"},{"alias_kind":"pith_short_8","alias_value":"ZN2PYD66","created_at":"2026-05-18T12:33:33.725879+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2606.05808","citing_title":"Galaxy morphology dependent (black hole mass)-(velocity dispersion) relations: implications for gravitational wave forecasts and cosmological simulations","ref_index":192,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV","json":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV.json","graph_json":"https://pith.science/api/pith-number/ZN2PYD662LA2LNPQNYRC4OPNYV/graph.json","events_json":"https://pith.science/api/pith-number/ZN2PYD662LA2LNPQNYRC4OPNYV/events.json","paper":"https://pith.science/paper/ZN2PYD66"},"agent_actions":{"view_html":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV","download_json":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV.json","view_paper":"https://pith.science/paper/ZN2PYD66","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1907.09791&json=true","fetch_graph":"https://pith.science/api/pith-number/ZN2PYD662LA2LNPQNYRC4OPNYV/graph.json","fetch_events":"https://pith.science/api/pith-number/ZN2PYD662LA2LNPQNYRC4OPNYV/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV/action/storage_attestation","attest_author":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV/action/author_attestation","sign_citation":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV/action/citation_signature","submit_replication":"https://pith.science/pith/ZN2PYD662LA2LNPQNYRC4OPNYV/action/replication_record"}},"created_at":"2026-05-17T23:39:50.024771+00:00","updated_at":"2026-05-17T23:39:50.024771+00:00"}