{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:BRUEV5NCJKLPB6V4MNEPIVXLSD","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":"59d395caa4d074cc3fee8fee0d6e6dc207ba26959386e85066abfbda17d126d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-05-09T13:18:43Z","title_canon_sha256":"c493247d75541e44891062d26b7c91e79cf6764639b90ff7b4d799d6fe3e4005"},"schema_version":"1.0","source":{"id":"1105.1665","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1105.1665","created_at":"2026-05-18T02:02:02Z"},{"alias_kind":"arxiv_version","alias_value":"1105.1665v1","created_at":"2026-05-18T02:02:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1105.1665","created_at":"2026-05-18T02:02:02Z"},{"alias_kind":"pith_short_12","alias_value":"BRUEV5NCJKLP","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"BRUEV5NCJKLPB6V4","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"BRUEV5NC","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:67e993bce719b708a473bd22a70ec7984b3de3045b69999cbcab3b7afb9e544e","target":"graph","created_at":"2026-05-18T02:02:02Z","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 long-slit spectroscopy and imaging data obtained with FORS2 on the Very Large Telescope of 13 optically selected type 2 quasars at z~0.3-0.6 from the original sample of Zakamska et al. (2003). The sample is likely to be affected by different selection biases. We investigate the evidence for: a) mergers/interactions b) star formation activity in the neighborhood of the quasars and c) extended emission line regions and their nature. Evidence for mergers/interactions is found in 5/13 objects. This is a lower limit for our sample, given the shallowness of most of our continuum images. A","authors_text":"A. Humphrey, A. Martinez-Sansigre, C. Tadhunter, M. Perez Torres, M. Villar-Martin, R. Fraga-Encinas, R. Gonzalez Delgado","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-05-09T13:18:43Z","title":"Interactions, star formation and extended nebulae in SDSS type 2 quasars at 0.3<~ z <~ 0.6"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1105.1665","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":"sha256:0270aaa4fe22e9b7c424a84906a7f4d6f0dea3f5db30f55e8dbc2ffae36f1d1b","target":"record","created_at":"2026-05-18T02:02:02Z","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":"59d395caa4d074cc3fee8fee0d6e6dc207ba26959386e85066abfbda17d126d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-05-09T13:18:43Z","title_canon_sha256":"c493247d75541e44891062d26b7c91e79cf6764639b90ff7b4d799d6fe3e4005"},"schema_version":"1.0","source":{"id":"1105.1665","kind":"arxiv","version":1}},"canonical_sha256":"0c684af5a24a96f0fabc6348f456eb90f6a9d0843b276bab0b47305209980cce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0c684af5a24a96f0fabc6348f456eb90f6a9d0843b276bab0b47305209980cce","first_computed_at":"2026-05-18T02:02:02.553180Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:02:02.553180Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2DXWbsWhuatc2ucAvuiFqwaa/qwDhMmKDCpJhpPyEWrehi3JRoI92qpg3lQWQ9va3C2MMaUv5Z2VghC2oIeFBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:02:02.553849Z","signed_message":"canonical_sha256_bytes"},"source_id":"1105.1665","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0270aaa4fe22e9b7c424a84906a7f4d6f0dea3f5db30f55e8dbc2ffae36f1d1b","sha256:67e993bce719b708a473bd22a70ec7984b3de3045b69999cbcab3b7afb9e544e"],"state_sha256":"6fef1b007795223b3dc3815b1149968eb4624a16eaf9c3bb3ef21c431291078d"}