{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:PDI4JGRVZSWYTUTLIBTZKUZNUU","short_pith_number":"pith:PDI4JGRV","canonical_record":{"source":{"id":"1803.00020","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-02-28T19:00:06Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"8c5c63c433dbebc75fe8b93d2ee7dbc39d47ff737855f859d82d2b65bed3f631","abstract_canon_sha256":"dd8de39a14d80ef26904ed77f8eec9802b0a9f6641b79eccb9c0f260317777c0"},"schema_version":"1.0"},"canonical_sha256":"78d1c49a35ccad89d26b406795532da5193f8be7faf61bc396f01e32db93181d","source":{"kind":"arxiv","id":"1803.00020","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.00020","created_at":"2026-05-18T00:17:38Z"},{"alias_kind":"arxiv_version","alias_value":"1803.00020v1","created_at":"2026-05-18T00:17:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.00020","created_at":"2026-05-18T00:17:38Z"},{"alias_kind":"pith_short_12","alias_value":"PDI4JGRVZSWY","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"PDI4JGRVZSWYTUTL","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"PDI4JGRV","created_at":"2026-05-18T12:32:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:PDI4JGRVZSWYTUTLIBTZKUZNUU","target":"record","payload":{"canonical_record":{"source":{"id":"1803.00020","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-02-28T19:00:06Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"8c5c63c433dbebc75fe8b93d2ee7dbc39d47ff737855f859d82d2b65bed3f631","abstract_canon_sha256":"dd8de39a14d80ef26904ed77f8eec9802b0a9f6641b79eccb9c0f260317777c0"},"schema_version":"1.0"},"canonical_sha256":"78d1c49a35ccad89d26b406795532da5193f8be7faf61bc396f01e32db93181d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:17:38.538817Z","signature_b64":"652e1cPobrb7U+ob+65OmcbANVdXp+HsdLSwe7J5Cghr5a8FVle55ph9PFJ3JbP2+MjQYX41XlqzzFj2UWFmAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"78d1c49a35ccad89d26b406795532da5193f8be7faf61bc396f01e32db93181d","last_reissued_at":"2026-05-18T00:17:38.538263Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:17:38.538263Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.00020","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":"2026-05-18T00:17:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K3eW494x287XsVTPu28ofGg6EBuQfggnSwwpCO5HqyLdUFT1yxixcLtaECEdBhYNs5grSJRqfHgnYzc0ur7VCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T08:04:11.153700Z"},"content_sha256":"f53d39c294fa5aaf3a999d50af3eaf31ef8a7f149b703bf5100a2133ecbcc3a8","schema_version":"1.0","event_id":"sha256:f53d39c294fa5aaf3a999d50af3eaf31ef8a7f149b703bf5100a2133ecbcc3a8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:PDI4JGRVZSWYTUTLIBTZKUZNUU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray scaling relations of early-type galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"A.C. Edge, A.N. Vantyghem, B.R. McNamara, F.A. Pulido, H.R. Russell, Iu.V. Babyk, M.T. Hogan, P.E.J. Nulsen","submitted_at":"2018-02-28T19:00:06Z","abstract_excerpt":"X-ray luminosity, temperature, gas mass, total mass, and their scaling relations are derived for 94 early-type galaxies using archival $Chandra$ X-ray Observatory observations. Consistent with earlier studies, the scaling relations, $L_X \\propto T^{4.5\\pm0.2}$, $M \\propto T^{2.4\\pm0.2}$, and $L_X \\propto M^{2.8\\pm0.3}$, are significantly steeper than expected from self similarity. This steepening indicates that their atmospheres are heated above the level expected from gravitational infall alone. Energetic feedback from nuclear black holes and supernova explosions are likely heating agents. Th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.00020","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":"2026-05-18T00:17:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ARZ7+VWKGVClStY6fum0FnCjar1anvwVJD68+R4HteVegbzWCCH4OHYGvuDrcOCS/y55+mptfkkrr5qrDH6CCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T08:04:11.154048Z"},"content_sha256":"7753681582504bd0041a07e62f69d9217a694afead7941a105bb21000a12b7a2","schema_version":"1.0","event_id":"sha256:7753681582504bd0041a07e62f69d9217a694afead7941a105bb21000a12b7a2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PDI4JGRVZSWYTUTLIBTZKUZNUU/bundle.json","state_url":"https://pith.science/pith/PDI4JGRVZSWYTUTLIBTZKUZNUU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PDI4JGRVZSWYTUTLIBTZKUZNUU/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":"2026-06-02T08:04:11Z","links":{"resolver":"https://pith.science/pith/PDI4JGRVZSWYTUTLIBTZKUZNUU","bundle":"https://pith.science/pith/PDI4JGRVZSWYTUTLIBTZKUZNUU/bundle.json","state":"https://pith.science/pith/PDI4JGRVZSWYTUTLIBTZKUZNUU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PDI4JGRVZSWYTUTLIBTZKUZNUU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:PDI4JGRVZSWYTUTLIBTZKUZNUU","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":"dd8de39a14d80ef26904ed77f8eec9802b0a9f6641b79eccb9c0f260317777c0","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-02-28T19:00:06Z","title_canon_sha256":"8c5c63c433dbebc75fe8b93d2ee7dbc39d47ff737855f859d82d2b65bed3f631"},"schema_version":"1.0","source":{"id":"1803.00020","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.00020","created_at":"2026-05-18T00:17:38Z"},{"alias_kind":"arxiv_version","alias_value":"1803.00020v1","created_at":"2026-05-18T00:17:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.00020","created_at":"2026-05-18T00:17:38Z"},{"alias_kind":"pith_short_12","alias_value":"PDI4JGRVZSWY","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"PDI4JGRVZSWYTUTL","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"PDI4JGRV","created_at":"2026-05-18T12:32:43Z"}],"graph_snapshots":[{"event_id":"sha256:7753681582504bd0041a07e62f69d9217a694afead7941a105bb21000a12b7a2","target":"graph","created_at":"2026-05-18T00:17:38Z","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":"X-ray luminosity, temperature, gas mass, total mass, and their scaling relations are derived for 94 early-type galaxies using archival $Chandra$ X-ray Observatory observations. Consistent with earlier studies, the scaling relations, $L_X \\propto T^{4.5\\pm0.2}$, $M \\propto T^{2.4\\pm0.2}$, and $L_X \\propto M^{2.8\\pm0.3}$, are significantly steeper than expected from self similarity. This steepening indicates that their atmospheres are heated above the level expected from gravitational infall alone. Energetic feedback from nuclear black holes and supernova explosions are likely heating agents. Th","authors_text":"A.C. Edge, A.N. Vantyghem, B.R. McNamara, F.A. Pulido, H.R. Russell, Iu.V. Babyk, M.T. Hogan, P.E.J. Nulsen","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-02-28T19:00:06Z","title":"X-ray scaling relations of early-type galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.00020","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:f53d39c294fa5aaf3a999d50af3eaf31ef8a7f149b703bf5100a2133ecbcc3a8","target":"record","created_at":"2026-05-18T00:17:38Z","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":"dd8de39a14d80ef26904ed77f8eec9802b0a9f6641b79eccb9c0f260317777c0","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-02-28T19:00:06Z","title_canon_sha256":"8c5c63c433dbebc75fe8b93d2ee7dbc39d47ff737855f859d82d2b65bed3f631"},"schema_version":"1.0","source":{"id":"1803.00020","kind":"arxiv","version":1}},"canonical_sha256":"78d1c49a35ccad89d26b406795532da5193f8be7faf61bc396f01e32db93181d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"78d1c49a35ccad89d26b406795532da5193f8be7faf61bc396f01e32db93181d","first_computed_at":"2026-05-18T00:17:38.538263Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:17:38.538263Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"652e1cPobrb7U+ob+65OmcbANVdXp+HsdLSwe7J5Cghr5a8FVle55ph9PFJ3JbP2+MjQYX41XlqzzFj2UWFmAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:17:38.538817Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.00020","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f53d39c294fa5aaf3a999d50af3eaf31ef8a7f149b703bf5100a2133ecbcc3a8","sha256:7753681582504bd0041a07e62f69d9217a694afead7941a105bb21000a12b7a2"],"state_sha256":"e7f14331a864963952c2b96f78cb72e9af5aed60de029d3acc87986a88df7c03"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"46Mn0qjUHLq1qABg0pLrYOuhg1Z4ULH4CLAPgDqMsXCbPF32wGifAMolhpjIr9y0cvanH7LtmH/Jq16BjFqSAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T08:04:11.156043Z","bundle_sha256":"5cf53150c742edb647339ac8dcba71caaeab699225900b6a7cfdeaab4ac00bba"}}