{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:4J646F4ZSZ4TISC4SDNCEVOH2J","short_pith_number":"pith:4J646F4Z","schema_version":"1.0","canonical_sha256":"e27dcf1799967934485c90da2255c7d26cf517b8929069759f2750d9fbf05684","source":{"kind":"arxiv","id":"1904.00486","version":1},"attestation_state":"computed","paper":{"title":"Galaxies and Supermassive Black Holes at z <= 0.1: The Velocity Dispersion Function","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alison Crocker, Farhanul Hasan","submitted_at":"2019-03-31T21:19:35Z","abstract_excerpt":"We study the distribution of central velocity dispersion, sigma, for >100000 galaxies in the SDSS at 0.01 <= z <= 0.1. We construct the velocity dispersion function (VDF) from samples complete for all sigma, where galaxies with sigma greater than the sigma-completeness limit of the SDSS spectroscopic survey are included. We compare two different sigma estimates; one based on SDSS spectroscopy (sigma_spec) and another on photometric estimates (sigma_mod). The sigma_spec for our sample is systematically higher than sigma_mod for all ranges of sigma, implying that rotational velocity may affect s"},"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":"1904.00486","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-31T21:19:35Z","cross_cats_sorted":[],"title_canon_sha256":"6180e1d99e8b0e775809dbda2184187d7fa316175c9702b099efda211e0d11c0","abstract_canon_sha256":"a1b9cc18f765083b9b6aad6961af3267902384a90dd93ee656a5b6f8af71830f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:48.306153Z","signature_b64":"Z79FfEe7I65Fxg0j2ZMtOQnyarg5Bhl8AyVR2IBvww7uYMt6qjyNWt3mPSgcieW8aFf7ktc4HTVxR1EmrTunCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e27dcf1799967934485c90da2255c7d26cf517b8929069759f2750d9fbf05684","last_reissued_at":"2026-05-17T23:49:48.305655Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:48.305655Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Galaxies and Supermassive Black Holes at z <= 0.1: The Velocity Dispersion Function","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Alison Crocker, Farhanul Hasan","submitted_at":"2019-03-31T21:19:35Z","abstract_excerpt":"We study the distribution of central velocity dispersion, sigma, for >100000 galaxies in the SDSS at 0.01 <= z <= 0.1. We construct the velocity dispersion function (VDF) from samples complete for all sigma, where galaxies with sigma greater than the sigma-completeness limit of the SDSS spectroscopic survey are included. We compare two different sigma estimates; one based on SDSS spectroscopy (sigma_spec) and another on photometric estimates (sigma_mod). The sigma_spec for our sample is systematically higher than sigma_mod for all ranges of sigma, implying that rotational velocity may affect s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.00486","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":"1904.00486","created_at":"2026-05-17T23:49:48.305732+00:00"},{"alias_kind":"arxiv_version","alias_value":"1904.00486v1","created_at":"2026-05-17T23:49:48.305732+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.00486","created_at":"2026-05-17T23:49:48.305732+00:00"},{"alias_kind":"pith_short_12","alias_value":"4J646F4ZSZ4T","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_16","alias_value":"4J646F4ZSZ4TISC4","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_8","alias_value":"4J646F4Z","created_at":"2026-05-18T12:33:10.108867+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/4J646F4ZSZ4TISC4SDNCEVOH2J","json":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J.json","graph_json":"https://pith.science/api/pith-number/4J646F4ZSZ4TISC4SDNCEVOH2J/graph.json","events_json":"https://pith.science/api/pith-number/4J646F4ZSZ4TISC4SDNCEVOH2J/events.json","paper":"https://pith.science/paper/4J646F4Z"},"agent_actions":{"view_html":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J","download_json":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J.json","view_paper":"https://pith.science/paper/4J646F4Z","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1904.00486&json=true","fetch_graph":"https://pith.science/api/pith-number/4J646F4ZSZ4TISC4SDNCEVOH2J/graph.json","fetch_events":"https://pith.science/api/pith-number/4J646F4ZSZ4TISC4SDNCEVOH2J/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J/action/timestamp_anchor","attest_storage":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J/action/storage_attestation","attest_author":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J/action/author_attestation","sign_citation":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J/action/citation_signature","submit_replication":"https://pith.science/pith/4J646F4ZSZ4TISC4SDNCEVOH2J/action/replication_record"}},"created_at":"2026-05-17T23:49:48.305732+00:00","updated_at":"2026-05-17T23:49:48.305732+00:00"}