{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:YJ6L2M7B67HBXXSV4OD7ON5JWS","short_pith_number":"pith:YJ6L2M7B","canonical_record":{"source":{"id":"0910.4814","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-10-26T07:03:03Z","cross_cats_sorted":[],"title_canon_sha256":"765dae3f92d2f0dc6b5341fb68419ec327492f1e45d0a374d9f6ff8fead0db80","abstract_canon_sha256":"b6279ddad9dfa0d09b02dfcd97e2ff63015f9c2da8f1a823f77609d3e3ff34f7"},"schema_version":"1.0"},"canonical_sha256":"c27cbd33e1f7ce1bde55e387f737a9b4a65fa06ae9ee0b60ee9d29c081f56e6c","source":{"kind":"arxiv","id":"0910.4814","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.4814","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"arxiv_version","alias_value":"0910.4814v1","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.4814","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"pith_short_12","alias_value":"YJ6L2M7B67HB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"YJ6L2M7B67HBXXSV","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"YJ6L2M7B","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:YJ6L2M7B67HBXXSV4OD7ON5JWS","target":"record","payload":{"canonical_record":{"source":{"id":"0910.4814","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-10-26T07:03:03Z","cross_cats_sorted":[],"title_canon_sha256":"765dae3f92d2f0dc6b5341fb68419ec327492f1e45d0a374d9f6ff8fead0db80","abstract_canon_sha256":"b6279ddad9dfa0d09b02dfcd97e2ff63015f9c2da8f1a823f77609d3e3ff34f7"},"schema_version":"1.0"},"canonical_sha256":"c27cbd33e1f7ce1bde55e387f737a9b4a65fa06ae9ee0b60ee9d29c081f56e6c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:11.523475Z","signature_b64":"QFzglBna+98LFkXCT6dbL/wgEFbuc1a1ML0LHbpajKBBbDwFun6K8Vwr0nlebJP5knBt8mfIFg4jr7wenk5nBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c27cbd33e1f7ce1bde55e387f737a9b4a65fa06ae9ee0b60ee9d29c081f56e6c","last_reissued_at":"2026-05-18T02:11:11.522708Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:11.522708Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0910.4814","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":"2026-05-18T02:11:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vC0r/fxSqso77JLOiQ64EeQH//e6fACl2QaTe8TWEe0lMKW6G9cG3QidXh8vUDnKqFnwZzCJKgzcCVujUFvQAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T22:41:26.397463Z"},"content_sha256":"a91d0859668908c2527674b5913397725bc8809f0c5f769e40e3c12d8a12ca7e","schema_version":"1.0","event_id":"sha256:a91d0859668908c2527674b5913397725bc8809f0c5f769e40e3c12d8a12ca7e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:YJ6L2M7B67HBXXSV4OD7ON5JWS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectral classification of emission-line galaxies from the Sloan Digital Sky Survey. I. An improved classification for high redshift galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Fabrice Lamareille (LATT)","submitted_at":"2009-10-26T07:03:03Z","abstract_excerpt":"We study the spectral classification of emission-line galaxies as star-forming galaxies or Active Galactic Nuclei (AGNs). From the Sloan Digital Sky Survey (SDSS) high quality data, we define an improved classification to be used for high redshift galaxies. We classify emission-line galaxies of the SDSS according to the latest standard recipe using [Oiii]5007, [Nii]6584, [Sii]6717+6731, H, and H emission lines. We obtain four classes: star-forming galaxies, Seyfert 2, LINERs, and composites. We then examine where these galaxies fall in the blue diagram used at high redshift (i.e. log([Oiii]500"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.4814","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":"2026-05-18T02:11:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zDjOAajz/DH/6+GubhEscg1uMLXWpsLscnVFVoON1JZ9eAOiw6BDwKEX76VoDm0CzRTIadb/Ez3RVj8AdfmhAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T22:41:26.398161Z"},"content_sha256":"eba28127116a8e99c0f25b564bebf8b0e46da4bd02a52999eca84c1d44fbdce8","schema_version":"1.0","event_id":"sha256:eba28127116a8e99c0f25b564bebf8b0e46da4bd02a52999eca84c1d44fbdce8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YJ6L2M7B67HBXXSV4OD7ON5JWS/bundle.json","state_url":"https://pith.science/pith/YJ6L2M7B67HBXXSV4OD7ON5JWS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YJ6L2M7B67HBXXSV4OD7ON5JWS/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":"2026-06-05T22:41:26Z","links":{"resolver":"https://pith.science/pith/YJ6L2M7B67HBXXSV4OD7ON5JWS","bundle":"https://pith.science/pith/YJ6L2M7B67HBXXSV4OD7ON5JWS/bundle.json","state":"https://pith.science/pith/YJ6L2M7B67HBXXSV4OD7ON5JWS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YJ6L2M7B67HBXXSV4OD7ON5JWS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:YJ6L2M7B67HBXXSV4OD7ON5JWS","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":"b6279ddad9dfa0d09b02dfcd97e2ff63015f9c2da8f1a823f77609d3e3ff34f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-10-26T07:03:03Z","title_canon_sha256":"765dae3f92d2f0dc6b5341fb68419ec327492f1e45d0a374d9f6ff8fead0db80"},"schema_version":"1.0","source":{"id":"0910.4814","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.4814","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"arxiv_version","alias_value":"0910.4814v1","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.4814","created_at":"2026-05-18T02:11:11Z"},{"alias_kind":"pith_short_12","alias_value":"YJ6L2M7B67HB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"YJ6L2M7B67HBXXSV","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"YJ6L2M7B","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:eba28127116a8e99c0f25b564bebf8b0e46da4bd02a52999eca84c1d44fbdce8","target":"graph","created_at":"2026-05-18T02:11:11Z","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 study the spectral classification of emission-line galaxies as star-forming galaxies or Active Galactic Nuclei (AGNs). From the Sloan Digital Sky Survey (SDSS) high quality data, we define an improved classification to be used for high redshift galaxies. We classify emission-line galaxies of the SDSS according to the latest standard recipe using [Oiii]5007, [Nii]6584, [Sii]6717+6731, H, and H emission lines. We obtain four classes: star-forming galaxies, Seyfert 2, LINERs, and composites. We then examine where these galaxies fall in the blue diagram used at high redshift (i.e. log([Oiii]500","authors_text":"Fabrice Lamareille (LATT)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-10-26T07:03:03Z","title":"Spectral classification of emission-line galaxies from the Sloan Digital Sky Survey. I. An improved classification for high redshift galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.4814","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:a91d0859668908c2527674b5913397725bc8809f0c5f769e40e3c12d8a12ca7e","target":"record","created_at":"2026-05-18T02:11:11Z","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":"b6279ddad9dfa0d09b02dfcd97e2ff63015f9c2da8f1a823f77609d3e3ff34f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-10-26T07:03:03Z","title_canon_sha256":"765dae3f92d2f0dc6b5341fb68419ec327492f1e45d0a374d9f6ff8fead0db80"},"schema_version":"1.0","source":{"id":"0910.4814","kind":"arxiv","version":1}},"canonical_sha256":"c27cbd33e1f7ce1bde55e387f737a9b4a65fa06ae9ee0b60ee9d29c081f56e6c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c27cbd33e1f7ce1bde55e387f737a9b4a65fa06ae9ee0b60ee9d29c081f56e6c","first_computed_at":"2026-05-18T02:11:11.522708Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:11:11.522708Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QFzglBna+98LFkXCT6dbL/wgEFbuc1a1ML0LHbpajKBBbDwFun6K8Vwr0nlebJP5knBt8mfIFg4jr7wenk5nBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:11:11.523475Z","signed_message":"canonical_sha256_bytes"},"source_id":"0910.4814","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a91d0859668908c2527674b5913397725bc8809f0c5f769e40e3c12d8a12ca7e","sha256:eba28127116a8e99c0f25b564bebf8b0e46da4bd02a52999eca84c1d44fbdce8"],"state_sha256":"f78432358fe0593d6b2ed6babbf321ec85690c4a153f4edd52a51ba77d973c6c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W5tMR9Hb84XOhg44OgmtqYmp6K/eoYN8u7VMEQn0CoCYDpTUtoci7oPZbqxDhUpiRznD4yg9f2+f7E62rAttBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T22:41:26.402617Z","bundle_sha256":"db93392d86b7bf4d444f554b0ce4f1fb2f5c36136d72628aea9e1b156509c53e"}}