{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:OWIHF4UABNPBYEHODLYOUXEDNQ","short_pith_number":"pith:OWIHF4UA","canonical_record":{"source":{"id":"1111.1215","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-11-04T19:11:34Z","cross_cats_sorted":[],"title_canon_sha256":"bed3d667eadcf9875e78f536f1fa1ac8ada6442301e3d621cca9fa4a77b3217d","abstract_canon_sha256":"6ab46d6d0946767b74bd104a6edeefe0205a48a1369a261acf24264329aa1c81"},"schema_version":"1.0"},"canonical_sha256":"759072f2800b5e1c10ee1af0ea5c836c08ca259e1c62ff225e800b21f6bda417","source":{"kind":"arxiv","id":"1111.1215","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.1215","created_at":"2026-05-18T01:59:45Z"},{"alias_kind":"arxiv_version","alias_value":"1111.1215v1","created_at":"2026-05-18T01:59:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.1215","created_at":"2026-05-18T01:59:45Z"},{"alias_kind":"pith_short_12","alias_value":"OWIHF4UABNPB","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"OWIHF4UABNPBYEHO","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"OWIHF4UA","created_at":"2026-05-18T12:26:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:OWIHF4UABNPBYEHODLYOUXEDNQ","target":"record","payload":{"canonical_record":{"source":{"id":"1111.1215","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-11-04T19:11:34Z","cross_cats_sorted":[],"title_canon_sha256":"bed3d667eadcf9875e78f536f1fa1ac8ada6442301e3d621cca9fa4a77b3217d","abstract_canon_sha256":"6ab46d6d0946767b74bd104a6edeefe0205a48a1369a261acf24264329aa1c81"},"schema_version":"1.0"},"canonical_sha256":"759072f2800b5e1c10ee1af0ea5c836c08ca259e1c62ff225e800b21f6bda417","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:59:45.314760Z","signature_b64":"vemW1H/WjLnDF47hhLhIPFzs4VXCZoAMvKeYLsUDg1xNNkXPx7DzHpeVUIAtmLPwpwQsRWDvN5jDl5ZX0TL1Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"759072f2800b5e1c10ee1af0ea5c836c08ca259e1c62ff225e800b21f6bda417","last_reissued_at":"2026-05-18T01:59:45.313896Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:59:45.313896Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1111.1215","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:59:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zajf3jVTaN8sxTYn5Ckip+7EE3tZt8J8fg9BCvm32OiS6OKOKJJtfiWb4M6aPzML8jMClXozWjMbdEiQk1byBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:27:51.413917Z"},"content_sha256":"158531cb7f7bce6e235866397848611ede163c8ebe5890092076e39c4878e85d","schema_version":"1.0","event_id":"sha256:158531cb7f7bce6e235866397848611ede163c8ebe5890092076e39c4878e85d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:OWIHF4UABNPBYEHODLYOUXEDNQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A High Resolution Atlas of Composite SDSS Galaxy Spectra","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Alexander S. Szalay, Ching-Wa Yip, Istv\\'an Csabai, L\\'aszl\\'o Dobos, Tam\\'as Budav\\'ari, Vivienne Wild","submitted_at":"2011-11-04T19:11:34Z","abstract_excerpt":"In this work we present an atlas of composite spectra of galaxies based on the data of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Galaxies are classified by colour, nuclear activity and star-formation activity to calculate average spectra of high signal-to-noise ratio and resolution (S/N = 132 - 4760 at {Dlambda = 1 A), using an algorithm that is robust against outliers. Besides composite spectra, we also compute the first five principal components of the distributions in each galaxy class to characterize the nature of variations of individual spectra around the averages. The cont"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.1215","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:59:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"84WvLOznGyK65HNyGTAWkxsJD0rSXJWIc2IYRZj1I6HWVpQdaKh7wrfDmjDsewLCW8VcFiqIJZgTGM78kG9wAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:27:51.414575Z"},"content_sha256":"fe0e9712f0e40a5a21d9f6707c0edbce422e8091bbf2a90ef182b536495125fe","schema_version":"1.0","event_id":"sha256:fe0e9712f0e40a5a21d9f6707c0edbce422e8091bbf2a90ef182b536495125fe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OWIHF4UABNPBYEHODLYOUXEDNQ/bundle.json","state_url":"https://pith.science/pith/OWIHF4UABNPBYEHODLYOUXEDNQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OWIHF4UABNPBYEHODLYOUXEDNQ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T00:27:51Z","links":{"resolver":"https://pith.science/pith/OWIHF4UABNPBYEHODLYOUXEDNQ","bundle":"https://pith.science/pith/OWIHF4UABNPBYEHODLYOUXEDNQ/bundle.json","state":"https://pith.science/pith/OWIHF4UABNPBYEHODLYOUXEDNQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OWIHF4UABNPBYEHODLYOUXEDNQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:OWIHF4UABNPBYEHODLYOUXEDNQ","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":"6ab46d6d0946767b74bd104a6edeefe0205a48a1369a261acf24264329aa1c81","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-11-04T19:11:34Z","title_canon_sha256":"bed3d667eadcf9875e78f536f1fa1ac8ada6442301e3d621cca9fa4a77b3217d"},"schema_version":"1.0","source":{"id":"1111.1215","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.1215","created_at":"2026-05-18T01:59:45Z"},{"alias_kind":"arxiv_version","alias_value":"1111.1215v1","created_at":"2026-05-18T01:59:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.1215","created_at":"2026-05-18T01:59:45Z"},{"alias_kind":"pith_short_12","alias_value":"OWIHF4UABNPB","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_16","alias_value":"OWIHF4UABNPBYEHO","created_at":"2026-05-18T12:26:37Z"},{"alias_kind":"pith_short_8","alias_value":"OWIHF4UA","created_at":"2026-05-18T12:26:37Z"}],"graph_snapshots":[{"event_id":"sha256:fe0e9712f0e40a5a21d9f6707c0edbce422e8091bbf2a90ef182b536495125fe","target":"graph","created_at":"2026-05-18T01:59:45Z","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":"In this work we present an atlas of composite spectra of galaxies based on the data of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Galaxies are classified by colour, nuclear activity and star-formation activity to calculate average spectra of high signal-to-noise ratio and resolution (S/N = 132 - 4760 at {Dlambda = 1 A), using an algorithm that is robust against outliers. Besides composite spectra, we also compute the first five principal components of the distributions in each galaxy class to characterize the nature of variations of individual spectra around the averages. The cont","authors_text":"Alexander S. Szalay, Ching-Wa Yip, Istv\\'an Csabai, L\\'aszl\\'o Dobos, Tam\\'as Budav\\'ari, Vivienne Wild","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-11-04T19:11:34Z","title":"A High Resolution Atlas of Composite SDSS Galaxy Spectra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.1215","kind":"arxiv","version":1},"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":"sha256:158531cb7f7bce6e235866397848611ede163c8ebe5890092076e39c4878e85d","target":"record","created_at":"2026-05-18T01:59:45Z","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":"6ab46d6d0946767b74bd104a6edeefe0205a48a1369a261acf24264329aa1c81","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-11-04T19:11:34Z","title_canon_sha256":"bed3d667eadcf9875e78f536f1fa1ac8ada6442301e3d621cca9fa4a77b3217d"},"schema_version":"1.0","source":{"id":"1111.1215","kind":"arxiv","version":1}},"canonical_sha256":"759072f2800b5e1c10ee1af0ea5c836c08ca259e1c62ff225e800b21f6bda417","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"759072f2800b5e1c10ee1af0ea5c836c08ca259e1c62ff225e800b21f6bda417","first_computed_at":"2026-05-18T01:59:45.313896Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:59:45.313896Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vemW1H/WjLnDF47hhLhIPFzs4VXCZoAMvKeYLsUDg1xNNkXPx7DzHpeVUIAtmLPwpwQsRWDvN5jDl5ZX0TL1Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T01:59:45.314760Z","signed_message":"canonical_sha256_bytes"},"source_id":"1111.1215","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:158531cb7f7bce6e235866397848611ede163c8ebe5890092076e39c4878e85d","sha256:fe0e9712f0e40a5a21d9f6707c0edbce422e8091bbf2a90ef182b536495125fe"],"state_sha256":"86059bd80d027cf80b77df6a3fb84fed10ed4586be38c49dfcf68e484b3d8bec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"odFs96WWjr32i4/PhtkPDwVLM8Ibfq4EbnfSRrFVbUA1+nA9b5RbqOxI+wTpNmMV9BqHS5Iuw84eC/XTDEsHCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T00:27:51.417795Z","bundle_sha256":"66ce0bbe38398a59d239c3f24e139f32ad621c23d17c059c9ebf9266ae3859e2"}}