{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:CKR5J2QPAH3HVTCGKHFVDY4RRS","short_pith_number":"pith:CKR5J2QP","canonical_record":{"source":{"id":"1409.7083","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-09-24T20:13:15Z","cross_cats_sorted":[],"title_canon_sha256":"63741c438449831456e67935fc198a36f08319020e81f994d08270f3b9dccf0c","abstract_canon_sha256":"4a7d2516077234c8749cc55f6c341bd08ff55bea58e0e80add3971ba286ea7e7"},"schema_version":"1.0"},"canonical_sha256":"12a3d4ea0f01f67acc4651cb51e3918c9106bf97451f02747787d7dcd7cb8f3b","source":{"kind":"arxiv","id":"1409.7083","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.7083","created_at":"2026-05-18T02:34:51Z"},{"alias_kind":"arxiv_version","alias_value":"1409.7083v1","created_at":"2026-05-18T02:34:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.7083","created_at":"2026-05-18T02:34:51Z"},{"alias_kind":"pith_short_12","alias_value":"CKR5J2QPAH3H","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"CKR5J2QPAH3HVTCG","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"CKR5J2QP","created_at":"2026-05-18T12:28:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:CKR5J2QPAH3HVTCGKHFVDY4RRS","target":"record","payload":{"canonical_record":{"source":{"id":"1409.7083","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-09-24T20:13:15Z","cross_cats_sorted":[],"title_canon_sha256":"63741c438449831456e67935fc198a36f08319020e81f994d08270f3b9dccf0c","abstract_canon_sha256":"4a7d2516077234c8749cc55f6c341bd08ff55bea58e0e80add3971ba286ea7e7"},"schema_version":"1.0"},"canonical_sha256":"12a3d4ea0f01f67acc4651cb51e3918c9106bf97451f02747787d7dcd7cb8f3b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:34:51.655141Z","signature_b64":"Pz18BdZbZT2YQB2naTStvlxMwXy86w0t3obgt726xWqVubr3Nxo4k1MkZubXGT0mozFXnmL8xPPKyTb0HmZ3BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"12a3d4ea0f01f67acc4651cb51e3918c9106bf97451f02747787d7dcd7cb8f3b","last_reissued_at":"2026-05-18T02:34:51.654768Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:34:51.654768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1409.7083","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":"2026-05-18T02:34:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7wXB1LXuObELVn2rWiMbpjzlFAkaGC14SQPeSTtxfqHewGYyI92NLudfHTa7g7CZFCTN8axsDZYHnnB2Cu++DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T13:32:08.336017Z"},"content_sha256":"2f87370ac5ca99cf6f917b33b7071740fc5f279535a399e6af2a0ce6f444a928","schema_version":"1.0","event_id":"sha256:2f87370ac5ca99cf6f917b33b7071740fc5f279535a399e6af2a0ce6f444a928"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:CKR5J2QPAH3HVTCGKHFVDY4RRS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A mass threshold in the number density of passive galaxies at z$\\sim$2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"(2) INAF - Osservatorio Astronomico di Trieste, (3) UEDIN, (4) Department of Astronomy, (5) Space Telescope Science Institute (6) kavli institute for particle astrophysics, A. Fontana (1), A. Galametz (1), A. Grazian (1), A. Lamastra (1), A. Merson (7), Amherst, Astronomy, cosmology (7) Department of Physics, D. Paris (1), H. Ferguson (4), J. S. Dunlop (3), L. Pentericci (1), MA, M. Castellano (1), M. Giavalisco (5), M. Nonino (2), N. Menci (1), P. Santini (1), R. J. McLure (3), R. Somerville (4), T. Targett (3) ((1) INAF-OARome, University College London), University of Massachusetts, USA, V. Sommariva (1), Y. Lu (6)","submitted_at":"2014-09-24T20:13:15Z","abstract_excerpt":"The process that quenched star formation in galaxies at intermediate and high redshift is still the subject of considerable debate. One way to investigate this puzzling issue is to study the number density of quiescent galaxies at z~2, and its dependence on mass. Here we present the results of a new study based on very deep Ks-band imaging (with the HAWK-I instrument on the VLT) of two HST CANDELS fields (the UKIDSS Ultra-deep survey (UDS) field and GOODS-South). The new HAWK-I data (taken as part of the HUGS VLT Large Program) reach detection limits of Ks>26 (AB mag). We select a sample of pa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.7083","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":"2026-05-18T02:34:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JwRKpoEi5ZzNDwJpvF0+X6KyXqd8k8aZpwyvgufmv3YMTDj9mTiiwiMJ6mRwvMszqwE6XML5a+kPmQU7eGQyCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T13:32:08.336383Z"},"content_sha256":"3caf478148bf176ad32bd5e6195a7348667fd4127b29a90b50b0e2f56ee01ba9","schema_version":"1.0","event_id":"sha256:3caf478148bf176ad32bd5e6195a7348667fd4127b29a90b50b0e2f56ee01ba9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CKR5J2QPAH3HVTCGKHFVDY4RRS/bundle.json","state_url":"https://pith.science/pith/CKR5J2QPAH3HVTCGKHFVDY4RRS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CKR5J2QPAH3HVTCGKHFVDY4RRS/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":"2026-06-24T13:32:08Z","links":{"resolver":"https://pith.science/pith/CKR5J2QPAH3HVTCGKHFVDY4RRS","bundle":"https://pith.science/pith/CKR5J2QPAH3HVTCGKHFVDY4RRS/bundle.json","state":"https://pith.science/pith/CKR5J2QPAH3HVTCGKHFVDY4RRS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CKR5J2QPAH3HVTCGKHFVDY4RRS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:CKR5J2QPAH3HVTCGKHFVDY4RRS","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":"4a7d2516077234c8749cc55f6c341bd08ff55bea58e0e80add3971ba286ea7e7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-09-24T20:13:15Z","title_canon_sha256":"63741c438449831456e67935fc198a36f08319020e81f994d08270f3b9dccf0c"},"schema_version":"1.0","source":{"id":"1409.7083","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.7083","created_at":"2026-05-18T02:34:51Z"},{"alias_kind":"arxiv_version","alias_value":"1409.7083v1","created_at":"2026-05-18T02:34:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.7083","created_at":"2026-05-18T02:34:51Z"},{"alias_kind":"pith_short_12","alias_value":"CKR5J2QPAH3H","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_16","alias_value":"CKR5J2QPAH3HVTCG","created_at":"2026-05-18T12:28:22Z"},{"alias_kind":"pith_short_8","alias_value":"CKR5J2QP","created_at":"2026-05-18T12:28:22Z"}],"graph_snapshots":[{"event_id":"sha256:3caf478148bf176ad32bd5e6195a7348667fd4127b29a90b50b0e2f56ee01ba9","target":"graph","created_at":"2026-05-18T02:34:51Z","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":"The process that quenched star formation in galaxies at intermediate and high redshift is still the subject of considerable debate. One way to investigate this puzzling issue is to study the number density of quiescent galaxies at z~2, and its dependence on mass. Here we present the results of a new study based on very deep Ks-band imaging (with the HAWK-I instrument on the VLT) of two HST CANDELS fields (the UKIDSS Ultra-deep survey (UDS) field and GOODS-South). The new HAWK-I data (taken as part of the HUGS VLT Large Program) reach detection limits of Ks>26 (AB mag). We select a sample of pa","authors_text":"(2) INAF - Osservatorio Astronomico di Trieste, (3) UEDIN, (4) Department of Astronomy, (5) Space Telescope Science Institute (6) kavli institute for particle astrophysics, A. Fontana (1), A. Galametz (1), A. Grazian (1), A. Lamastra (1), A. Merson (7), Amherst, Astronomy, cosmology (7) Department of Physics, D. Paris (1), H. Ferguson (4), J. S. Dunlop (3), L. Pentericci (1), MA, M. Castellano (1), M. Giavalisco (5), M. Nonino (2), N. Menci (1), P. Santini (1), R. J. McLure (3), R. Somerville (4), T. Targett (3) ((1) INAF-OARome, University College London), University of Massachusetts, USA, V. Sommariva (1), Y. Lu (6)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-09-24T20:13:15Z","title":"A mass threshold in the number density of passive galaxies at z$\\sim$2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.7083","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":"sha256:2f87370ac5ca99cf6f917b33b7071740fc5f279535a399e6af2a0ce6f444a928","target":"record","created_at":"2026-05-18T02:34:51Z","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":"4a7d2516077234c8749cc55f6c341bd08ff55bea58e0e80add3971ba286ea7e7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-09-24T20:13:15Z","title_canon_sha256":"63741c438449831456e67935fc198a36f08319020e81f994d08270f3b9dccf0c"},"schema_version":"1.0","source":{"id":"1409.7083","kind":"arxiv","version":1}},"canonical_sha256":"12a3d4ea0f01f67acc4651cb51e3918c9106bf97451f02747787d7dcd7cb8f3b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"12a3d4ea0f01f67acc4651cb51e3918c9106bf97451f02747787d7dcd7cb8f3b","first_computed_at":"2026-05-18T02:34:51.654768Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:34:51.654768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Pz18BdZbZT2YQB2naTStvlxMwXy86w0t3obgt726xWqVubr3Nxo4k1MkZubXGT0mozFXnmL8xPPKyTb0HmZ3BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:34:51.655141Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.7083","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2f87370ac5ca99cf6f917b33b7071740fc5f279535a399e6af2a0ce6f444a928","sha256:3caf478148bf176ad32bd5e6195a7348667fd4127b29a90b50b0e2f56ee01ba9"],"state_sha256":"609ded682e7fe1649357c602559899c2f072cf3dc31def69be78cdb032060c7e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"igl/or5oukkx043S7HMHWGfG9mLJM3Kox8kwBAlQRwfvEv1vULFxV/WaE/B8EF3gmkWfdX3OwfAVRStvW/goCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T13:32:08.338459Z","bundle_sha256":"25c84c5bd3eaf2c81ea5bf42bb75717f3851122979d39f890bbc29fc5f709d57"}}