{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:SBD2MM3A6JDPV2N7TTFYP52PWB","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"2ddccff5b975133f4904d004aca2c0de51495225b1ddd574e432c24addcd97c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-10T07:52:53Z","title_canon_sha256":"26609f58fd1c0414d8ce4401c7bcf898e453ff1ee599510da19aa5858f933ce5"},"schema_version":"1.0","source":{"id":"1305.2273","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.2273","created_at":"2026-05-18T01:50:03Z"},{"alias_kind":"arxiv_version","alias_value":"1305.2273v2","created_at":"2026-05-18T01:50:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.2273","created_at":"2026-05-18T01:50:03Z"},{"alias_kind":"pith_short_12","alias_value":"SBD2MM3A6JDP","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_16","alias_value":"SBD2MM3A6JDPV2N7","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_8","alias_value":"SBD2MM3A","created_at":"2026-05-18T12:27:59Z"}],"graph_snapshots":[{"event_id":"sha256:eb0a3226259c652fd8596845c36cc44038097135a6e61c0583687a6a583ab7a5","target":"graph","created_at":"2026-05-18T01:50:03Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We perform a spectroscopic study to constrain the stellar Initial Mass Function (IMF) by using a large sample of 24,781 early-type galaxies from the SDSS-based SPIDER survey. Clear evidence is found of a trend between IMF and central velocity dispersion, sigma0, evolving from a standard Kroupa/Chabrier IMF at 100km/s towards a more bottom-heavy IMF with increasing sigma0, becoming steeper than the Salpeter function at sigma0>220km/s. We analyze a variety of spectral indices, corrected to solar scale by means of semi-empirical correlations, and fitted simultaneously with extended MILES (MIUSCAT","authors_text":"(2) MSSL-UCL, (3) IAC, 4), (4) DA-Universidad de La Laguna, (5) INPE-DAS, (6) DAA-Universitat de Valencia), A. Vazdekis (3, E. Ricciardelli (6) ((1) INAF-OAC, F. La Barbera (1), I. Ferreras (2), I. G. de la Rosa (3, J. Falc\\'on-Barroso (3, M. Trevisan (5), R. R. de Carvalho (5)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-10T07:52:53Z","title":"SPIDER VIII - Constraints on the Stellar Initial Mass Function of Early-type Galaxies from a Variety of Spectral Features"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.2273","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:6e00ca2e8d50cfa31284cd40fe59081eba80c358ee89f9a317ba5cc345630630","target":"record","created_at":"2026-05-18T01:50:03Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"2ddccff5b975133f4904d004aca2c0de51495225b1ddd574e432c24addcd97c5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-10T07:52:53Z","title_canon_sha256":"26609f58fd1c0414d8ce4401c7bcf898e453ff1ee599510da19aa5858f933ce5"},"schema_version":"1.0","source":{"id":"1305.2273","kind":"arxiv","version":2}},"canonical_sha256":"9047a63360f246fae9bf9ccb87f74fb04cde1da647975768bab21a970aae493e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9047a63360f246fae9bf9ccb87f74fb04cde1da647975768bab21a970aae493e","first_computed_at":"2026-05-18T01:50:03.831236Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:50:03.831236Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"avJeCufQzEJ4lKLnGXh3YkKRRjIj3er5t4OR+lPLXjzrTB6vdseJY4FIRu+8FbjSwiGzKbEetclF8Z/NWLXlAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:50:03.831792Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.2273","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6e00ca2e8d50cfa31284cd40fe59081eba80c358ee89f9a317ba5cc345630630","sha256:eb0a3226259c652fd8596845c36cc44038097135a6e61c0583687a6a583ab7a5"],"state_sha256":"3fece0c1c7e16ce592f636cada9b2423636dfdda7618bfa0bb4c080276c6c519"}