{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:ABSJICLD6WAFZTNQYU6FV3YCFL","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":"cf73bcb95124c0e23816ab66e040e66842efa13741d22da75a85dc76f046423c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-07T14:50:55Z","title_canon_sha256":"a9aeab2bb93d89f3769167d02a50353bf8a337a759c544387240646d2101c418"},"schema_version":"1.0","source":{"id":"1407.1732","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.1732","created_at":"2026-05-18T02:45:21Z"},{"alias_kind":"arxiv_version","alias_value":"1407.1732v1","created_at":"2026-05-18T02:45:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.1732","created_at":"2026-05-18T02:45:21Z"},{"alias_kind":"pith_short_12","alias_value":"ABSJICLD6WAF","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_16","alias_value":"ABSJICLD6WAFZTNQ","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_8","alias_value":"ABSJICLD","created_at":"2026-05-18T12:28:19Z"}],"graph_snapshots":[{"event_id":"sha256:8627871514ef5d48834820712d5bef6a0756f88c0d593e55b097d885bdd77b7e","target":"graph","created_at":"2026-05-18T02:45:21Z","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 present GMRT HI observations and deep CFHT MegaCam optical images of the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877 (hereafter NGC 871/6/7). Our high-resolution data sets provide a census of the HI and stellar properties of the detected gas-rich group members. In addition to a handful of spiral, irregular and dwarf galaxies, this group harbours an intriguing HI feature, AGC 749170, that has a gas mass of ~10^9.3 M_sol, a dynamical-to-gas mass ratio of ~1 (assuming the cloud is rotating and in dynamical equilibrium) and no optical counterpart in previous imaging. Our observati","authors_text":"J. Cannon, J.-C. Cuillandre, J. Sick, K. Lee-Waddell, K. Spekkens, M. P. Haynes, N. Patra, P. Chandra, R. Giovanelli, S. Stierwalt","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-07T14:50:55Z","title":"An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1732","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":"sha256:3706788b2f1ff4348c2cd60f413a9300d7ee1238581b5d185306c89c449f1150","target":"record","created_at":"2026-05-18T02:45:21Z","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":"cf73bcb95124c0e23816ab66e040e66842efa13741d22da75a85dc76f046423c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-07-07T14:50:55Z","title_canon_sha256":"a9aeab2bb93d89f3769167d02a50353bf8a337a759c544387240646d2101c418"},"schema_version":"1.0","source":{"id":"1407.1732","kind":"arxiv","version":1}},"canonical_sha256":"0064940963f5805ccdb0c53c5aef022ae7427f201a8f6f3690d8fffb6b8a666b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0064940963f5805ccdb0c53c5aef022ae7427f201a8f6f3690d8fffb6b8a666b","first_computed_at":"2026-05-18T02:45:21.279105Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:45:21.279105Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ui0jid5BeSWh4qimvtIfQNB3WCSNVISEuaqXDv7HKuvplakM4KmwCADJvg5CCSha8lDZiB1MIqgzc6PjSzrSDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:45:21.279568Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.1732","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3706788b2f1ff4348c2cd60f413a9300d7ee1238581b5d185306c89c449f1150","sha256:8627871514ef5d48834820712d5bef6a0756f88c0d593e55b097d885bdd77b7e"],"state_sha256":"1a8abb039e4c9ec8d819c9794f3da91e5bf82d558e01a690f64fa72bf6acbf56"}