{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:H2WJDPS2U4H7XKWLHYPTE6JXGN","short_pith_number":"pith:H2WJDPS2","canonical_record":{"source":{"id":"0911.1954","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-10T20:59:58Z","cross_cats_sorted":[],"title_canon_sha256":"e35a1ce7118dedf4a0b3f5519b4e132af729e142ce116bfc534f548d32a8ff2a","abstract_canon_sha256":"5aeb9dd101d3a1bc3508ac51a74036df39d1526b2512da54760b7c5533b97d6c"},"schema_version":"1.0"},"canonical_sha256":"3eac91be5aa70ffbaacb3e1f3279373361ac8daa65900411f144ebbdf7ee3dfc","source":{"kind":"arxiv","id":"0911.1954","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.1954","created_at":"2026-05-18T02:10:48Z"},{"alias_kind":"arxiv_version","alias_value":"0911.1954v1","created_at":"2026-05-18T02:10:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.1954","created_at":"2026-05-18T02:10:48Z"},{"alias_kind":"pith_short_12","alias_value":"H2WJDPS2U4H7","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"H2WJDPS2U4H7XKWL","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"H2WJDPS2","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:H2WJDPS2U4H7XKWLHYPTE6JXGN","target":"record","payload":{"canonical_record":{"source":{"id":"0911.1954","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-10T20:59:58Z","cross_cats_sorted":[],"title_canon_sha256":"e35a1ce7118dedf4a0b3f5519b4e132af729e142ce116bfc534f548d32a8ff2a","abstract_canon_sha256":"5aeb9dd101d3a1bc3508ac51a74036df39d1526b2512da54760b7c5533b97d6c"},"schema_version":"1.0"},"canonical_sha256":"3eac91be5aa70ffbaacb3e1f3279373361ac8daa65900411f144ebbdf7ee3dfc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:10:48.997569Z","signature_b64":"gfknLZjQn2eBJsl1GSv19hF44C9kYNjuwwyHxRmG4Pr07yfcK6Qfjr/UKZAAJAhWsxq6aiUcz/WSYJaJIIcSCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3eac91be5aa70ffbaacb3e1f3279373361ac8daa65900411f144ebbdf7ee3dfc","last_reissued_at":"2026-05-18T02:10:48.996577Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:10:48.996577Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0911.1954","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":"2026-05-18T02:10:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m62dGoP6kBGFaCJzrG0krOQxZiuShEZSo13zoQ1JZIkCoNoTuI72M0qLNbvaTTHzY6jrA6Vi2N5bqL4BK5TcCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:59:38.716391Z"},"content_sha256":"63dd2e58341e29e3e3bdc6b6fce65afe0f6a7d3fe62c3af3914f370e62d3cf82","schema_version":"1.0","event_id":"sha256:63dd2e58341e29e3e3bdc6b6fce65afe0f6a7d3fe62c3af3914f370e62d3cf82"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:H2WJDPS2U4H7XKWLHYPTE6JXGN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deep multi-frequency radio imaging in the Lockman Hole using the GMRT and VLA: II. The spectral index of submillimetre galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. Pope, Edinburgh), Edo Ibar (UK ATC, Ian Smail, J.S. Dunlop, K. Coppin, P.N. Best, R.J. Ivison","submitted_at":"2009-11-10T20:59:58Z","abstract_excerpt":"We have employed the GMRT and the VLA to map the Lockman Hole. At 610 and 1,400 MHz, we reach noise levels of 15 and 6 uJy/beam, respectively, with well-matched resolutions (~5\"). At this depth we obtained reliable detections for about half of the known submm galaxies (SMGs) in the field. For radio-identified SMGs, which are typically at z ~ 2, we measure a mean radio spectral index of alpha = -0.75 +/- 0.06 and standard deviation of 0.29, between rest-frame ~1.8 and ~4.2 GHz. The slope of their continuum emission is indistinguishable from that of local star-forming galaxies and suggests that "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.1954","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":"2026-05-18T02:10:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2svVNCbOhrlfOTzxbrc4h92XL5nRQI7O0nHyX1ygBUeI/9TdUxVaF3Ui3jUInSg5Iu3SsIpL30Zsnygnd7/7Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:59:38.717034Z"},"content_sha256":"8144141d4773e29a05cfc253638a2a48cc918c6332496f07b4bd5e6dc6ffb061","schema_version":"1.0","event_id":"sha256:8144141d4773e29a05cfc253638a2a48cc918c6332496f07b4bd5e6dc6ffb061"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H2WJDPS2U4H7XKWLHYPTE6JXGN/bundle.json","state_url":"https://pith.science/pith/H2WJDPS2U4H7XKWLHYPTE6JXGN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H2WJDPS2U4H7XKWLHYPTE6JXGN/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":"2026-05-28T20:59:38Z","links":{"resolver":"https://pith.science/pith/H2WJDPS2U4H7XKWLHYPTE6JXGN","bundle":"https://pith.science/pith/H2WJDPS2U4H7XKWLHYPTE6JXGN/bundle.json","state":"https://pith.science/pith/H2WJDPS2U4H7XKWLHYPTE6JXGN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H2WJDPS2U4H7XKWLHYPTE6JXGN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:H2WJDPS2U4H7XKWLHYPTE6JXGN","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":"5aeb9dd101d3a1bc3508ac51a74036df39d1526b2512da54760b7c5533b97d6c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-10T20:59:58Z","title_canon_sha256":"e35a1ce7118dedf4a0b3f5519b4e132af729e142ce116bfc534f548d32a8ff2a"},"schema_version":"1.0","source":{"id":"0911.1954","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.1954","created_at":"2026-05-18T02:10:48Z"},{"alias_kind":"arxiv_version","alias_value":"0911.1954v1","created_at":"2026-05-18T02:10:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.1954","created_at":"2026-05-18T02:10:48Z"},{"alias_kind":"pith_short_12","alias_value":"H2WJDPS2U4H7","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"H2WJDPS2U4H7XKWL","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"H2WJDPS2","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:8144141d4773e29a05cfc253638a2a48cc918c6332496f07b4bd5e6dc6ffb061","target":"graph","created_at":"2026-05-18T02:10:48Z","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 have employed the GMRT and the VLA to map the Lockman Hole. At 610 and 1,400 MHz, we reach noise levels of 15 and 6 uJy/beam, respectively, with well-matched resolutions (~5\"). At this depth we obtained reliable detections for about half of the known submm galaxies (SMGs) in the field. For radio-identified SMGs, which are typically at z ~ 2, we measure a mean radio spectral index of alpha = -0.75 +/- 0.06 and standard deviation of 0.29, between rest-frame ~1.8 and ~4.2 GHz. The slope of their continuum emission is indistinguishable from that of local star-forming galaxies and suggests that ","authors_text":"A. Pope, Edinburgh), Edo Ibar (UK ATC, Ian Smail, J.S. Dunlop, K. Coppin, P.N. Best, R.J. Ivison","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-10T20:59:58Z","title":"Deep multi-frequency radio imaging in the Lockman Hole using the GMRT and VLA: II. The spectral index of submillimetre galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.1954","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":"sha256:63dd2e58341e29e3e3bdc6b6fce65afe0f6a7d3fe62c3af3914f370e62d3cf82","target":"record","created_at":"2026-05-18T02:10:48Z","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":"5aeb9dd101d3a1bc3508ac51a74036df39d1526b2512da54760b7c5533b97d6c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-11-10T20:59:58Z","title_canon_sha256":"e35a1ce7118dedf4a0b3f5519b4e132af729e142ce116bfc534f548d32a8ff2a"},"schema_version":"1.0","source":{"id":"0911.1954","kind":"arxiv","version":1}},"canonical_sha256":"3eac91be5aa70ffbaacb3e1f3279373361ac8daa65900411f144ebbdf7ee3dfc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3eac91be5aa70ffbaacb3e1f3279373361ac8daa65900411f144ebbdf7ee3dfc","first_computed_at":"2026-05-18T02:10:48.996577Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:48.996577Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gfknLZjQn2eBJsl1GSv19hF44C9kYNjuwwyHxRmG4Pr07yfcK6Qfjr/UKZAAJAhWsxq6aiUcz/WSYJaJIIcSCA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:48.997569Z","signed_message":"canonical_sha256_bytes"},"source_id":"0911.1954","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:63dd2e58341e29e3e3bdc6b6fce65afe0f6a7d3fe62c3af3914f370e62d3cf82","sha256:8144141d4773e29a05cfc253638a2a48cc918c6332496f07b4bd5e6dc6ffb061"],"state_sha256":"5704867d50496ce5cbfe992e82b8f2296ffb33af94e1d264e9966fdd9c5155c2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Oo46tVd6o4ymqGR2v1LQJ3RtRPhXvPQsha+kP4jDZR+YDFFMrpI5HhvhqxcV4fq8v3VREDdtMqoJSndZChvEBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T20:59:38.720150Z","bundle_sha256":"bbae201d1adcee42b234b2b98f26cba72eb84342230c3ab81e79771882ea7e14"}}