{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:EMDDWOEDG4WNJNDTUCXZOUDE3X","short_pith_number":"pith:EMDDWOED","canonical_record":{"source":{"id":"1209.2003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T14:13:27Z","cross_cats_sorted":[],"title_canon_sha256":"10a24b3b86197f80ded62b07344e3dd9f53939412b0917cb7d62e07803bafed1","abstract_canon_sha256":"997e4d59045a0c90aa6a7bcd7a38bd3f77b2ba7c3f1446736c23ada241363317"},"schema_version":"1.0"},"canonical_sha256":"23063b3883372cd4b473a0af975064ddeb010e3f8dff83b232a0949ef822c466","source":{"kind":"arxiv","id":"1209.2003","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2003","created_at":"2026-05-18T01:54:37Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2003v1","created_at":"2026-05-18T01:54:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2003","created_at":"2026-05-18T01:54:37Z"},{"alias_kind":"pith_short_12","alias_value":"EMDDWOEDG4WN","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"EMDDWOEDG4WNJNDT","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"EMDDWOED","created_at":"2026-05-18T12:27:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:EMDDWOEDG4WNJNDTUCXZOUDE3X","target":"record","payload":{"canonical_record":{"source":{"id":"1209.2003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T14:13:27Z","cross_cats_sorted":[],"title_canon_sha256":"10a24b3b86197f80ded62b07344e3dd9f53939412b0917cb7d62e07803bafed1","abstract_canon_sha256":"997e4d59045a0c90aa6a7bcd7a38bd3f77b2ba7c3f1446736c23ada241363317"},"schema_version":"1.0"},"canonical_sha256":"23063b3883372cd4b473a0af975064ddeb010e3f8dff83b232a0949ef822c466","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:37.645040Z","signature_b64":"f7Gi/+R0jv+ZbswX88BjUFqmsg5upo4lLaUVNl2HfyMyiw2ylU7P4bfshTb4rSiWMyn2DbMhxjziYbioA1czCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"23063b3883372cd4b473a0af975064ddeb010e3f8dff83b232a0949ef822c466","last_reissued_at":"2026-05-18T01:54:37.644351Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:37.644351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.2003","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":"2026-05-18T01:54:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ctorkU2oQ2zkVAvDBwZBPvNoAvhgIjPJZ8d+kVNKxFFLhEOEJU7cdpJVlIU8+bqLG+UqKr1mbFc0hJIB11Y4AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:13:32.075118Z"},"content_sha256":"7abec24d89c84e316c8e6b7a596de186391631dce977afeb517528020cf799cf","schema_version":"1.0","event_id":"sha256:7abec24d89c84e316c8e6b7a596de186391631dce977afeb517528020cf799cf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:EMDDWOEDG4WNJNDTUCXZOUDE3X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ALFALFA HI Data Stacking III. Comparison of environmental trends in HI gas mass fraction and specific star formation rate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Barbara Catinella, Cheng Li, Guinevere Kauffmann, Martha P. Haynes, Riccardo Giovanelli, Silvia Fabello","submitted_at":"2012-09-10T14:13:27Z","abstract_excerpt":"It is well known that both the star formation rate and the cold gas content of a galaxy depend on the local density out to distances of a few Megaparsecs. In this paper, we compare the environmental density dependence of the atomic gas mass fractions of nearby galaxies with the density dependence of their central and global specific star formation rates. We stack HI line spectra extracted from the Arecibo Legacy Fast ALFA survey centered on galaxies with UV imaging from GALEX and optical imaging/spectroscopy from SDSS. We use these stacked spectra to evaluate the mean atomic gas mass fraction "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2003","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":"2026-05-18T01:54:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r/7sYd9vIu4dRDsZMZeQTSIDkiVfKoychfeHSZClKo44mmymsTQbzh7nQX+Ols7KuWSP5DIaoU2IXnmsAlGGAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T08:13:32.075485Z"},"content_sha256":"1bdffac642f06c6fa133ea55437795ce3fe50df05f6365c576a519a9bf4b6adc","schema_version":"1.0","event_id":"sha256:1bdffac642f06c6fa133ea55437795ce3fe50df05f6365c576a519a9bf4b6adc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EMDDWOEDG4WNJNDTUCXZOUDE3X/bundle.json","state_url":"https://pith.science/pith/EMDDWOEDG4WNJNDTUCXZOUDE3X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EMDDWOEDG4WNJNDTUCXZOUDE3X/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":"2026-05-28T08:13:32Z","links":{"resolver":"https://pith.science/pith/EMDDWOEDG4WNJNDTUCXZOUDE3X","bundle":"https://pith.science/pith/EMDDWOEDG4WNJNDTUCXZOUDE3X/bundle.json","state":"https://pith.science/pith/EMDDWOEDG4WNJNDTUCXZOUDE3X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EMDDWOEDG4WNJNDTUCXZOUDE3X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:EMDDWOEDG4WNJNDTUCXZOUDE3X","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":"997e4d59045a0c90aa6a7bcd7a38bd3f77b2ba7c3f1446736c23ada241363317","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T14:13:27Z","title_canon_sha256":"10a24b3b86197f80ded62b07344e3dd9f53939412b0917cb7d62e07803bafed1"},"schema_version":"1.0","source":{"id":"1209.2003","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2003","created_at":"2026-05-18T01:54:37Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2003v1","created_at":"2026-05-18T01:54:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2003","created_at":"2026-05-18T01:54:37Z"},{"alias_kind":"pith_short_12","alias_value":"EMDDWOEDG4WN","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"EMDDWOEDG4WNJNDT","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"EMDDWOED","created_at":"2026-05-18T12:27:04Z"}],"graph_snapshots":[{"event_id":"sha256:1bdffac642f06c6fa133ea55437795ce3fe50df05f6365c576a519a9bf4b6adc","target":"graph","created_at":"2026-05-18T01:54:37Z","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":"It is well known that both the star formation rate and the cold gas content of a galaxy depend on the local density out to distances of a few Megaparsecs. In this paper, we compare the environmental density dependence of the atomic gas mass fractions of nearby galaxies with the density dependence of their central and global specific star formation rates. We stack HI line spectra extracted from the Arecibo Legacy Fast ALFA survey centered on galaxies with UV imaging from GALEX and optical imaging/spectroscopy from SDSS. We use these stacked spectra to evaluate the mean atomic gas mass fraction ","authors_text":"Barbara Catinella, Cheng Li, Guinevere Kauffmann, Martha P. Haynes, Riccardo Giovanelli, Silvia Fabello","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T14:13:27Z","title":"ALFALFA HI Data Stacking III. Comparison of environmental trends in HI gas mass fraction and specific star formation rate"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2003","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":"sha256:7abec24d89c84e316c8e6b7a596de186391631dce977afeb517528020cf799cf","target":"record","created_at":"2026-05-18T01:54:37Z","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":"997e4d59045a0c90aa6a7bcd7a38bd3f77b2ba7c3f1446736c23ada241363317","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-09-10T14:13:27Z","title_canon_sha256":"10a24b3b86197f80ded62b07344e3dd9f53939412b0917cb7d62e07803bafed1"},"schema_version":"1.0","source":{"id":"1209.2003","kind":"arxiv","version":1}},"canonical_sha256":"23063b3883372cd4b473a0af975064ddeb010e3f8dff83b232a0949ef822c466","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"23063b3883372cd4b473a0af975064ddeb010e3f8dff83b232a0949ef822c466","first_computed_at":"2026-05-18T01:54:37.644351Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:37.644351Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"f7Gi/+R0jv+ZbswX88BjUFqmsg5upo4lLaUVNl2HfyMyiw2ylU7P4bfshTb4rSiWMyn2DbMhxjziYbioA1czCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:37.645040Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.2003","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7abec24d89c84e316c8e6b7a596de186391631dce977afeb517528020cf799cf","sha256:1bdffac642f06c6fa133ea55437795ce3fe50df05f6365c576a519a9bf4b6adc"],"state_sha256":"1212361a9432bee2d9b282707e214d454b2dcd8babdc137c9a84e0b47f198499"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xHL933TQr96onvueTylu0lmPg3Rk3t4Yf5UrRLEuGoXphwey5e2oet8cMVBaSF2b29QfQ+0jA70TxiT+WlgICw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T08:13:32.077436Z","bundle_sha256":"e40d58e895e484325bd58c68528534ccd7040bc87a77050e99cdc539803d9fe4"}}