{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:PU5OCWFEBKOEB6DQVZ37KPPOXM","short_pith_number":"pith:PU5OCWFE","schema_version":"1.0","canonical_sha256":"7d3ae158a40a9c40f870ae77f53deebb333abf508deaea6f85521dbbaf7159f5","source":{"kind":"arxiv","id":"0903.2479","version":2},"attestation_state":"computed","paper":{"title":"Compact High-Redshift Galaxies Are the Cores of the Most Massive Present-Day Spheroids","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"(2) CITA, (3) NOAO), Chung-Pei Ma (1) ((1) Berkeley, Eliot Quataert (1), Kevin Bundy (1), Norman Murray (2), Philip F. Hopkins (1), Tod Lauer (3)","submitted_at":"2009-03-13T20:03:55Z","abstract_excerpt":"Observations suggest that effective radii of high-z massive spheroids are as much as a factor ~6 smaller than low-z galaxies of comparable mass. Given the apparent absence of low-z counterparts, this has often been interpreted as indicating that the high density, compact red galaxies must be 'puffed up' by some mechanism. We compare the ensemble of high-z observations with large samples of well-observed low-z ellipticals. At the same physical radii, the stellar surface mass densities of low and high-z systems are comparable. Moreover, the abundance of high surface density material at low redsh"},"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":"0903.2479","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-03-13T20:03:55Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"287a65b73a776f3683ff426e516489604f369e78c733b95f348d191dd6d4d1d0","abstract_canon_sha256":"d3b4831d93ab54fa7983cf5f1c3a0fe602524d64efcbec14d8cc7ec2bc0e3ebc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:28.323237Z","signature_b64":"UN5kWLGFuJydYOIwLjIhQjWmLAI/ltnSD9qSjFS25aGEAUJvqcRWL6Vg0PgiJIC0CTrXX1N05qk21tU2B/gcCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7d3ae158a40a9c40f870ae77f53deebb333abf508deaea6f85521dbbaf7159f5","last_reissued_at":"2026-05-18T02:14:28.322644Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:28.322644Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Compact High-Redshift Galaxies Are the Cores of the Most Massive Present-Day Spheroids","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"(2) CITA, (3) NOAO), Chung-Pei Ma (1) ((1) Berkeley, Eliot Quataert (1), Kevin Bundy (1), Norman Murray (2), Philip F. Hopkins (1), Tod Lauer (3)","submitted_at":"2009-03-13T20:03:55Z","abstract_excerpt":"Observations suggest that effective radii of high-z massive spheroids are as much as a factor ~6 smaller than low-z galaxies of comparable mass. Given the apparent absence of low-z counterparts, this has often been interpreted as indicating that the high density, compact red galaxies must be 'puffed up' by some mechanism. We compare the ensemble of high-z observations with large samples of well-observed low-z ellipticals. At the same physical radii, the stellar surface mass densities of low and high-z systems are comparable. Moreover, the abundance of high surface density material at low redsh"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.2479","kind":"arxiv","version":2},"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":"0903.2479","created_at":"2026-05-18T02:14:28.322707+00:00"},{"alias_kind":"arxiv_version","alias_value":"0903.2479v2","created_at":"2026-05-18T02:14:28.322707+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.2479","created_at":"2026-05-18T02:14:28.322707+00:00"},{"alias_kind":"pith_short_12","alias_value":"PU5OCWFEBKOE","created_at":"2026-05-18T12:26:01.383474+00:00"},{"alias_kind":"pith_short_16","alias_value":"PU5OCWFEBKOEB6DQ","created_at":"2026-05-18T12:26:01.383474+00:00"},{"alias_kind":"pith_short_8","alias_value":"PU5OCWFE","created_at":"2026-05-18T12:26:01.383474+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/PU5OCWFEBKOEB6DQVZ37KPPOXM","json":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM.json","graph_json":"https://pith.science/api/pith-number/PU5OCWFEBKOEB6DQVZ37KPPOXM/graph.json","events_json":"https://pith.science/api/pith-number/PU5OCWFEBKOEB6DQVZ37KPPOXM/events.json","paper":"https://pith.science/paper/PU5OCWFE"},"agent_actions":{"view_html":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM","download_json":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM.json","view_paper":"https://pith.science/paper/PU5OCWFE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0903.2479&json=true","fetch_graph":"https://pith.science/api/pith-number/PU5OCWFEBKOEB6DQVZ37KPPOXM/graph.json","fetch_events":"https://pith.science/api/pith-number/PU5OCWFEBKOEB6DQVZ37KPPOXM/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM/action/storage_attestation","attest_author":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM/action/author_attestation","sign_citation":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM/action/citation_signature","submit_replication":"https://pith.science/pith/PU5OCWFEBKOEB6DQVZ37KPPOXM/action/replication_record"}},"created_at":"2026-05-18T02:14:28.322707+00:00","updated_at":"2026-05-18T02:14:28.322707+00:00"}