{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:M4M6SACZ7JN2DZKMARORPBVQIK","short_pith_number":"pith:M4M6SACZ","canonical_record":{"source":{"id":"1412.4700","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-12-15T17:52:51Z","cross_cats_sorted":[],"title_canon_sha256":"61057454339a0b1cf1451248a36f91ce4e166a32cffaa467982411e591e79d46","abstract_canon_sha256":"a2c6dd8c61fa0904861b594d6c2ee4f05d9f1950beb7bfcc70b8b28027031d3d"},"schema_version":"1.0"},"canonical_sha256":"6719e90059fa5ba1e54c045d1786b042941025d03933366c8a772a1574dae066","source":{"kind":"arxiv","id":"1412.4700","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1412.4700","created_at":"2026-05-18T02:16:41Z"},{"alias_kind":"arxiv_version","alias_value":"1412.4700v2","created_at":"2026-05-18T02:16:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1412.4700","created_at":"2026-05-18T02:16:41Z"},{"alias_kind":"pith_short_12","alias_value":"M4M6SACZ7JN2","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"M4M6SACZ7JN2DZKM","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"M4M6SACZ","created_at":"2026-05-18T12:28:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:M4M6SACZ7JN2DZKMARORPBVQIK","target":"record","payload":{"canonical_record":{"source":{"id":"1412.4700","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-12-15T17:52:51Z","cross_cats_sorted":[],"title_canon_sha256":"61057454339a0b1cf1451248a36f91ce4e166a32cffaa467982411e591e79d46","abstract_canon_sha256":"a2c6dd8c61fa0904861b594d6c2ee4f05d9f1950beb7bfcc70b8b28027031d3d"},"schema_version":"1.0"},"canonical_sha256":"6719e90059fa5ba1e54c045d1786b042941025d03933366c8a772a1574dae066","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:16:41.048456Z","signature_b64":"6C+lakykkTIuZbFkqeUcg9j3YBH17V/3gHShDWUSaItHu9bMBF9Azyn1IPUqH3qSFAKH519+joqJBxeOhvsnAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6719e90059fa5ba1e54c045d1786b042941025d03933366c8a772a1574dae066","last_reissued_at":"2026-05-18T02:16:41.047775Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:16:41.047775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1412.4700","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:16:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o1pi+v81DgMj3ZNezsN6i4OceK5Xulxq8cGU0QZ6LXpBLBwsCf4kjw3wnlcM03mDNapxk8VFWTVmP2vhDEDKDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T04:11:22.702997Z"},"content_sha256":"5c85f4778248d40de15ae9bfeb241c7481e77724d4da810e8aab975bfbd71998","schema_version":"1.0","event_id":"sha256:5c85f4778248d40de15ae9bfeb241c7481e77724d4da810e8aab975bfbd71998"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:M4M6SACZ7JN2DZKMARORPBVQIK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cosmological performance of SKA HI galaxy surveys","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"B. Bassett, M. G. Santos, M. Silva, P. Bull, P. Okouma, R. Maartens, S. Yahya","submitted_at":"2014-12-15T17:52:51Z","abstract_excerpt":"The Square Kilometre Array (SKA) will conduct the biggest spectroscopic galaxy survey ever, by detecting the 21cm emission line of neutral hydrogen (HI) from around a billion galaxies over 3/4 of the sky, out to a redshift of z~2. This will allow the redshift-space matter power spectrum, and corresponding dark energy observables, to be measured with unprecedented precision. In this paper, we present an improved model of the HI galaxy number counts and bias from semi-analytic simulations, and use it to calculate the expected yield of HI galaxies from surveys with a variety of Phase 1 and 2 SKA "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.4700","kind":"arxiv","version":2},"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":"2026-05-18T02:16:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ExS5PhNtXcNWYHCjH2J4snEP0nyHYalJ4E1E5zcCcHKV8Xx6Lc/T14y7DCL8KpwjCucxvpAetXYPfzrQMzjrDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T04:11:22.703361Z"},"content_sha256":"f912ce68b3a00e8994e225ba66e5b643e2a10504445b7c05fe20fc8571f1eb1a","schema_version":"1.0","event_id":"sha256:f912ce68b3a00e8994e225ba66e5b643e2a10504445b7c05fe20fc8571f1eb1a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M4M6SACZ7JN2DZKMARORPBVQIK/bundle.json","state_url":"https://pith.science/pith/M4M6SACZ7JN2DZKMARORPBVQIK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M4M6SACZ7JN2DZKMARORPBVQIK/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":"2026-05-28T04:11:22Z","links":{"resolver":"https://pith.science/pith/M4M6SACZ7JN2DZKMARORPBVQIK","bundle":"https://pith.science/pith/M4M6SACZ7JN2DZKMARORPBVQIK/bundle.json","state":"https://pith.science/pith/M4M6SACZ7JN2DZKMARORPBVQIK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M4M6SACZ7JN2DZKMARORPBVQIK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:M4M6SACZ7JN2DZKMARORPBVQIK","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":"a2c6dd8c61fa0904861b594d6c2ee4f05d9f1950beb7bfcc70b8b28027031d3d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-12-15T17:52:51Z","title_canon_sha256":"61057454339a0b1cf1451248a36f91ce4e166a32cffaa467982411e591e79d46"},"schema_version":"1.0","source":{"id":"1412.4700","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1412.4700","created_at":"2026-05-18T02:16:41Z"},{"alias_kind":"arxiv_version","alias_value":"1412.4700v2","created_at":"2026-05-18T02:16:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1412.4700","created_at":"2026-05-18T02:16:41Z"},{"alias_kind":"pith_short_12","alias_value":"M4M6SACZ7JN2","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"M4M6SACZ7JN2DZKM","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"M4M6SACZ","created_at":"2026-05-18T12:28:38Z"}],"graph_snapshots":[{"event_id":"sha256:f912ce68b3a00e8994e225ba66e5b643e2a10504445b7c05fe20fc8571f1eb1a","target":"graph","created_at":"2026-05-18T02:16:41Z","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 Square Kilometre Array (SKA) will conduct the biggest spectroscopic galaxy survey ever, by detecting the 21cm emission line of neutral hydrogen (HI) from around a billion galaxies over 3/4 of the sky, out to a redshift of z~2. This will allow the redshift-space matter power spectrum, and corresponding dark energy observables, to be measured with unprecedented precision. In this paper, we present an improved model of the HI galaxy number counts and bias from semi-analytic simulations, and use it to calculate the expected yield of HI galaxies from surveys with a variety of Phase 1 and 2 SKA ","authors_text":"B. Bassett, M. G. Santos, M. Silva, P. Bull, P. Okouma, R. Maartens, S. Yahya","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-12-15T17:52:51Z","title":"Cosmological performance of SKA HI galaxy surveys"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.4700","kind":"arxiv","version":2},"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":"sha256:5c85f4778248d40de15ae9bfeb241c7481e77724d4da810e8aab975bfbd71998","target":"record","created_at":"2026-05-18T02:16:41Z","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":"a2c6dd8c61fa0904861b594d6c2ee4f05d9f1950beb7bfcc70b8b28027031d3d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-12-15T17:52:51Z","title_canon_sha256":"61057454339a0b1cf1451248a36f91ce4e166a32cffaa467982411e591e79d46"},"schema_version":"1.0","source":{"id":"1412.4700","kind":"arxiv","version":2}},"canonical_sha256":"6719e90059fa5ba1e54c045d1786b042941025d03933366c8a772a1574dae066","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6719e90059fa5ba1e54c045d1786b042941025d03933366c8a772a1574dae066","first_computed_at":"2026-05-18T02:16:41.047775Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:16:41.047775Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6C+lakykkTIuZbFkqeUcg9j3YBH17V/3gHShDWUSaItHu9bMBF9Azyn1IPUqH3qSFAKH519+joqJBxeOhvsnAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:16:41.048456Z","signed_message":"canonical_sha256_bytes"},"source_id":"1412.4700","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5c85f4778248d40de15ae9bfeb241c7481e77724d4da810e8aab975bfbd71998","sha256:f912ce68b3a00e8994e225ba66e5b643e2a10504445b7c05fe20fc8571f1eb1a"],"state_sha256":"78747b2e1874daa178b3be8bf03a71eb7f0cfdcfb406d372737f1ae0593b3805"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/o8LLkN7PT+ZZhIlyhqEbtw2+kKeahUFGdErDoKrMRViOr57D66HNvymIbrbvfRQBprEgWrvIZZOrgc/HYScCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T04:11:22.705431Z","bundle_sha256":"52af58426d30fe0f4ae87420d3821468feb20f2863a7c552d35a0469a3d581ca"}}