{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:WQQY7IM2Y5L4MMIRU6JMQZHJ55","short_pith_number":"pith:WQQY7IM2","canonical_record":{"source":{"id":"2301.03115","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-01-08T22:11:28Z","cross_cats_sorted":[],"title_canon_sha256":"d7193fa5a4b1456c8e6577a5a8797ab1a23a175895911bbc3ef01e83d3bc6b59","abstract_canon_sha256":"a1bb4092e181d0ffb678ea1018b8928ce48dde31a84239a898276c0c20c27bf8"},"schema_version":"1.0"},"canonical_sha256":"b4218fa19ac757c63111a792c864e9ef4344caffc8fd66fd0649279fb4cb3542","source":{"kind":"arxiv","id":"2301.03115","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2301.03115","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"arxiv_version","alias_value":"2301.03115v1","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2301.03115","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"pith_short_12","alias_value":"WQQY7IM2Y5L4","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"pith_short_16","alias_value":"WQQY7IM2Y5L4MMIR","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"pith_short_8","alias_value":"WQQY7IM2","created_at":"2026-07-05T05:44:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:WQQY7IM2Y5L4MMIRU6JMQZHJ55","target":"record","payload":{"canonical_record":{"source":{"id":"2301.03115","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-01-08T22:11:28Z","cross_cats_sorted":[],"title_canon_sha256":"d7193fa5a4b1456c8e6577a5a8797ab1a23a175895911bbc3ef01e83d3bc6b59","abstract_canon_sha256":"a1bb4092e181d0ffb678ea1018b8928ce48dde31a84239a898276c0c20c27bf8"},"schema_version":"1.0"},"canonical_sha256":"b4218fa19ac757c63111a792c864e9ef4344caffc8fd66fd0649279fb4cb3542","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:44:11.879727Z","signature_b64":"SRhSEXoVOXlA5x8go9F/hxiOgylQ83YtjQbEr6WAiztSWyZUrK+vdZ8mJ0ubZPQwYO84XqNFdOIzkZn2NQFZBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b4218fa19ac757c63111a792c864e9ef4344caffc8fd66fd0649279fb4cb3542","last_reissued_at":"2026-07-05T05:44:11.879202Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:44:11.879202Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2301.03115","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":"2026-07-05T05:44:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XOHhYpeQL971DQqAAWw9kty7mcM3gJOk5oU3Om6BNXsfYTNR9ZeK9gdeYr1h8PJ/mwkysChINxqRP6XrY1+LAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T16:13:02.006550Z"},"content_sha256":"035a75cc177bc99586e5eaea70ebf11b722503d98564c4cd53cb064c89fc0e60","schema_version":"1.0","event_id":"sha256:035a75cc177bc99586e5eaea70ebf11b722503d98564c4cd53cb064c89fc0e60"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:WQQY7IM2Y5L4MMIRU6JMQZHJ55","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of Hydrogen Radio Recombination Lines at z=0.89 towards PKS 1830-211","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Abhisek Mohapatra, Emmanuel Momjian, Francoise Combes, Gyula I. G. Jozsa, Hans-Rainer Klockner, Jonah D. Wagenveld, Kimberly L. Emig, Neeraj Gupta, Partha P. Deka, Pasquier Noterdaeme, Patrick Petitjean, Pedro Salas, Preshanth Jagannathan, Raghunathan Srianand, Sebastien Muller, Sergei A. Balashev, Yiqing Song","submitted_at":"2023-01-08T22:11:28Z","abstract_excerpt":"We report the detection of stimulated hydrogen radio recombination line (RRL) emission from ionized gas in a $z=0.89$ galaxy using 580--1670 MHz observations from the MeerKAT Absorption Line Survey (MALS). The RRL emission originates in a galaxy that intercepts and strongly lenses the radio blazar PKS 1830-211 ($z=2.5$). This is the second detection of RRLs outside of the local universe and the first clearly associated with hydrogen. We detect effective H144$\\alpha$ (and H163$\\alpha$) transitions at observed frequencies of 1156 (798) MHz by stacking 17 (27) RRLs with 21$\\sigma$ (14$\\sigma$) si"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2301.03115","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2301.03115/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T05:44:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kDgWyetXSJrwoFzlojNTCbegt2SHr4ytmZlqpck0CQVAO0j8MbN/XyyK7HObFZ1G+eHpWFiRekG0gBZnfv7ECw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T16:13:02.007427Z"},"content_sha256":"ef78a6ed14a7123ef33b2e7de2178d377a86b0a74ba7350583d92e429529229b","schema_version":"1.0","event_id":"sha256:ef78a6ed14a7123ef33b2e7de2178d377a86b0a74ba7350583d92e429529229b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WQQY7IM2Y5L4MMIRU6JMQZHJ55/bundle.json","state_url":"https://pith.science/pith/WQQY7IM2Y5L4MMIRU6JMQZHJ55/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WQQY7IM2Y5L4MMIRU6JMQZHJ55/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":"2026-08-23T16:13:02Z","links":{"resolver":"https://pith.science/pith/WQQY7IM2Y5L4MMIRU6JMQZHJ55","bundle":"https://pith.science/pith/WQQY7IM2Y5L4MMIRU6JMQZHJ55/bundle.json","state":"https://pith.science/pith/WQQY7IM2Y5L4MMIRU6JMQZHJ55/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WQQY7IM2Y5L4MMIRU6JMQZHJ55/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:WQQY7IM2Y5L4MMIRU6JMQZHJ55","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":"a1bb4092e181d0ffb678ea1018b8928ce48dde31a84239a898276c0c20c27bf8","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-01-08T22:11:28Z","title_canon_sha256":"d7193fa5a4b1456c8e6577a5a8797ab1a23a175895911bbc3ef01e83d3bc6b59"},"schema_version":"1.0","source":{"id":"2301.03115","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2301.03115","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"arxiv_version","alias_value":"2301.03115v1","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2301.03115","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"pith_short_12","alias_value":"WQQY7IM2Y5L4","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"pith_short_16","alias_value":"WQQY7IM2Y5L4MMIR","created_at":"2026-07-05T05:44:11Z"},{"alias_kind":"pith_short_8","alias_value":"WQQY7IM2","created_at":"2026-07-05T05:44:11Z"}],"graph_snapshots":[{"event_id":"sha256:ef78a6ed14a7123ef33b2e7de2178d377a86b0a74ba7350583d92e429529229b","target":"graph","created_at":"2026-07-05T05:44:11Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2301.03115/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the detection of stimulated hydrogen radio recombination line (RRL) emission from ionized gas in a $z=0.89$ galaxy using 580--1670 MHz observations from the MeerKAT Absorption Line Survey (MALS). The RRL emission originates in a galaxy that intercepts and strongly lenses the radio blazar PKS 1830-211 ($z=2.5$). This is the second detection of RRLs outside of the local universe and the first clearly associated with hydrogen. We detect effective H144$\\alpha$ (and H163$\\alpha$) transitions at observed frequencies of 1156 (798) MHz by stacking 17 (27) RRLs with 21$\\sigma$ (14$\\sigma$) si","authors_text":"Abhisek Mohapatra, Emmanuel Momjian, Francoise Combes, Gyula I. G. Jozsa, Hans-Rainer Klockner, Jonah D. Wagenveld, Kimberly L. Emig, Neeraj Gupta, Partha P. Deka, Pasquier Noterdaeme, Patrick Petitjean, Pedro Salas, Preshanth Jagannathan, Raghunathan Srianand, Sebastien Muller, Sergei A. Balashev, Yiqing Song","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-01-08T22:11:28Z","title":"Discovery of Hydrogen Radio Recombination Lines at z=0.89 towards PKS 1830-211"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2301.03115","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":"sha256:035a75cc177bc99586e5eaea70ebf11b722503d98564c4cd53cb064c89fc0e60","target":"record","created_at":"2026-07-05T05:44:11Z","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":"a1bb4092e181d0ffb678ea1018b8928ce48dde31a84239a898276c0c20c27bf8","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-01-08T22:11:28Z","title_canon_sha256":"d7193fa5a4b1456c8e6577a5a8797ab1a23a175895911bbc3ef01e83d3bc6b59"},"schema_version":"1.0","source":{"id":"2301.03115","kind":"arxiv","version":1}},"canonical_sha256":"b4218fa19ac757c63111a792c864e9ef4344caffc8fd66fd0649279fb4cb3542","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4218fa19ac757c63111a792c864e9ef4344caffc8fd66fd0649279fb4cb3542","first_computed_at":"2026-07-05T05:44:11.879202Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:44:11.879202Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SRhSEXoVOXlA5x8go9F/hxiOgylQ83YtjQbEr6WAiztSWyZUrK+vdZ8mJ0ubZPQwYO84XqNFdOIzkZn2NQFZBA==","signature_status":"signed_v1","signed_at":"2026-07-05T05:44:11.879727Z","signed_message":"canonical_sha256_bytes"},"source_id":"2301.03115","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:035a75cc177bc99586e5eaea70ebf11b722503d98564c4cd53cb064c89fc0e60","sha256:ef78a6ed14a7123ef33b2e7de2178d377a86b0a74ba7350583d92e429529229b"],"state_sha256":"75c7c99c3343fac3a85dcf05a962c9d7c268a0123661a395e3986435096cbd4e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZntiSGzbcFkcD/fkROvevyj+DSojF49+m9MCJUW0zc2WmyN2FKeAo90Ywxx4tG98sf6qm2UDhZtBk/b7XrelCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T16:13:02.012743Z","bundle_sha256":"9b3cb7c43d496652a9cc1effb88b3e03a062b522632d84babe582af788fe8099"}}