{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:WQ2476KCLYRYM7TP3Q6TT6TYE4","short_pith_number":"pith:WQ2476KC","canonical_record":{"source":{"id":"1511.05069","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-11-16T18:04:46Z","cross_cats_sorted":[],"title_canon_sha256":"5c804e98bc87019738c793a051b26ded1e027e3cccf92f1b9b2c764f1e74d89c","abstract_canon_sha256":"1abb998a368dfb4f6f44591bfe1923cc08c3d6785be0c600d1fc90032cae2790"},"schema_version":"1.0"},"canonical_sha256":"b435cff9425e23867e6fdc3d39fa7827299aaf7ff0314f8a6f6ea043e6ebfab4","source":{"kind":"arxiv","id":"1511.05069","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.05069","created_at":"2026-05-18T01:25:31Z"},{"alias_kind":"arxiv_version","alias_value":"1511.05069v1","created_at":"2026-05-18T01:25:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.05069","created_at":"2026-05-18T01:25:31Z"},{"alias_kind":"pith_short_12","alias_value":"WQ2476KCLYRY","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_16","alias_value":"WQ2476KCLYRYM7TP","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_8","alias_value":"WQ2476KC","created_at":"2026-05-18T12:29:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:WQ2476KCLYRYM7TP3Q6TT6TYE4","target":"record","payload":{"canonical_record":{"source":{"id":"1511.05069","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-11-16T18:04:46Z","cross_cats_sorted":[],"title_canon_sha256":"5c804e98bc87019738c793a051b26ded1e027e3cccf92f1b9b2c764f1e74d89c","abstract_canon_sha256":"1abb998a368dfb4f6f44591bfe1923cc08c3d6785be0c600d1fc90032cae2790"},"schema_version":"1.0"},"canonical_sha256":"b435cff9425e23867e6fdc3d39fa7827299aaf7ff0314f8a6f6ea043e6ebfab4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:31.101282Z","signature_b64":"Ubx45Ta4wpA8n3smeGWGmpntVcUvzAirRyPX/781t9Puu5HWcIgrHaPvfVwRiuNt1oyd6fFqTI3pItC6VF1rCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b435cff9425e23867e6fdc3d39fa7827299aaf7ff0314f8a6f6ea043e6ebfab4","last_reissued_at":"2026-05-18T01:25:31.100850Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:31.100850Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1511.05069","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":"2026-05-18T01:25:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b4XfGGSCky1eTI2U1l8fJ4ARN7SDGjs1msrlU6Tt173BnAgk4Bt0mD984afCSd5axzDjNkvyKpNRtvI9wKabAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T15:29:21.443183Z"},"content_sha256":"ef15f4c62ed29194971b9cca6bb5e2cd8b645c07cd03683888a16b47b11ac15b","schema_version":"1.0","event_id":"sha256:ef15f4c62ed29194971b9cca6bb5e2cd8b645c07cd03683888a16b47b11ac15b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:WQ2476KCLYRYM7TP3Q6TT6TYE4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Limits on the HI content of the dwarf galaxy Hydra II","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Andrew Janzen, A. Togi, Eve M. Klopf, Felix J. Lockman, Kurt Plarre, Mehrnoush Zomederis, Nau Raj Pokhrel, Robert J. Selina, Rodolfo Montez Jr","submitted_at":"2015-11-16T18:04:46Z","abstract_excerpt":"Sensitive 21cm HI observations have been made with the Green Bank Telescope toward the newly-discovered Local Group dwarf galaxy Hydra II, which may lie within the leading arm of the Magellanic Stream. No neutral hydrogen was detected. Our 5-sigma limit of MHI < 210 solar masses for a 15 km/s linewidth gives a gas-to-luminosity ratio MHI/L_V < 2.6 x 10^{-2} Mo / Lo. The limits on HI mass and MHI/L_V are typical of dwarf galaxies found within a few hundred kpc of the Milky Way. Whatever the origin of Hydra II, its neutral gas properties are not unusual."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.05069","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":"2026-05-18T01:25:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IElK1I0p3xUPJeW/DT0EG+cX5WmMYlOqsHIULkfyIqOIQJy/eN+AmCAB+w8p0sFn0ijhUSrHjjrOyx65a9hdBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T15:29:21.443796Z"},"content_sha256":"9b623cb689cc1f9ae7b322768956123436704e2a029591b4009cedda0bab4b6b","schema_version":"1.0","event_id":"sha256:9b623cb689cc1f9ae7b322768956123436704e2a029591b4009cedda0bab4b6b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WQ2476KCLYRYM7TP3Q6TT6TYE4/bundle.json","state_url":"https://pith.science/pith/WQ2476KCLYRYM7TP3Q6TT6TYE4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WQ2476KCLYRYM7TP3Q6TT6TYE4/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":"2026-05-31T15:29:21Z","links":{"resolver":"https://pith.science/pith/WQ2476KCLYRYM7TP3Q6TT6TYE4","bundle":"https://pith.science/pith/WQ2476KCLYRYM7TP3Q6TT6TYE4/bundle.json","state":"https://pith.science/pith/WQ2476KCLYRYM7TP3Q6TT6TYE4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WQ2476KCLYRYM7TP3Q6TT6TYE4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:WQ2476KCLYRYM7TP3Q6TT6TYE4","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":"1abb998a368dfb4f6f44591bfe1923cc08c3d6785be0c600d1fc90032cae2790","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-11-16T18:04:46Z","title_canon_sha256":"5c804e98bc87019738c793a051b26ded1e027e3cccf92f1b9b2c764f1e74d89c"},"schema_version":"1.0","source":{"id":"1511.05069","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1511.05069","created_at":"2026-05-18T01:25:31Z"},{"alias_kind":"arxiv_version","alias_value":"1511.05069v1","created_at":"2026-05-18T01:25:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1511.05069","created_at":"2026-05-18T01:25:31Z"},{"alias_kind":"pith_short_12","alias_value":"WQ2476KCLYRY","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_16","alias_value":"WQ2476KCLYRYM7TP","created_at":"2026-05-18T12:29:47Z"},{"alias_kind":"pith_short_8","alias_value":"WQ2476KC","created_at":"2026-05-18T12:29:47Z"}],"graph_snapshots":[{"event_id":"sha256:9b623cb689cc1f9ae7b322768956123436704e2a029591b4009cedda0bab4b6b","target":"graph","created_at":"2026-05-18T01:25:31Z","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":"Sensitive 21cm HI observations have been made with the Green Bank Telescope toward the newly-discovered Local Group dwarf galaxy Hydra II, which may lie within the leading arm of the Magellanic Stream. No neutral hydrogen was detected. Our 5-sigma limit of MHI < 210 solar masses for a 15 km/s linewidth gives a gas-to-luminosity ratio MHI/L_V < 2.6 x 10^{-2} Mo / Lo. The limits on HI mass and MHI/L_V are typical of dwarf galaxies found within a few hundred kpc of the Milky Way. Whatever the origin of Hydra II, its neutral gas properties are not unusual.","authors_text":"Andrew Janzen, A. Togi, Eve M. Klopf, Felix J. Lockman, Kurt Plarre, Mehrnoush Zomederis, Nau Raj Pokhrel, Robert J. Selina, Rodolfo Montez Jr","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-11-16T18:04:46Z","title":"Limits on the HI content of the dwarf galaxy Hydra II"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1511.05069","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:ef15f4c62ed29194971b9cca6bb5e2cd8b645c07cd03683888a16b47b11ac15b","target":"record","created_at":"2026-05-18T01:25:31Z","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":"1abb998a368dfb4f6f44591bfe1923cc08c3d6785be0c600d1fc90032cae2790","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-11-16T18:04:46Z","title_canon_sha256":"5c804e98bc87019738c793a051b26ded1e027e3cccf92f1b9b2c764f1e74d89c"},"schema_version":"1.0","source":{"id":"1511.05069","kind":"arxiv","version":1}},"canonical_sha256":"b435cff9425e23867e6fdc3d39fa7827299aaf7ff0314f8a6f6ea043e6ebfab4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b435cff9425e23867e6fdc3d39fa7827299aaf7ff0314f8a6f6ea043e6ebfab4","first_computed_at":"2026-05-18T01:25:31.100850Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:31.100850Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ubx45Ta4wpA8n3smeGWGmpntVcUvzAirRyPX/781t9Puu5HWcIgrHaPvfVwRiuNt1oyd6fFqTI3pItC6VF1rCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:31.101282Z","signed_message":"canonical_sha256_bytes"},"source_id":"1511.05069","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ef15f4c62ed29194971b9cca6bb5e2cd8b645c07cd03683888a16b47b11ac15b","sha256:9b623cb689cc1f9ae7b322768956123436704e2a029591b4009cedda0bab4b6b"],"state_sha256":"9989a81ed04fb3a50c05efb195076576dd12e2fc9a486de1414cc356fa46277e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EpHv26nKBc7DjRPzP1a8yQ2FvbxXfiYFHPfXwM+tHjLhOSKhStkpj4LQzvRlGPdQ4uEujMdxp5MGxNQ2glU2BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T15:29:21.448977Z","bundle_sha256":"5fe8f495a137802bb1dae5608af715cc0f9b46566b953ca32cbc2841991dc44c"}}