{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:AYBSVY62VWZOVPAFUDBIYHZ47F","short_pith_number":"pith:AYBSVY62","schema_version":"1.0","canonical_sha256":"06032ae3daadb2eabc05a0c28c1f3cf97b4f331c35f03a78525cc5085156989e","source":{"kind":"arxiv","id":"2308.12993","version":2},"attestation_state":"computed","paper":{"title":"The MUSE Ultra Deep Field (MUDF). IV. A pair of X-ray weak quasars at the heart of two extended Ly{\\alpha} nebulae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"Celine Peroux, Elisabeta Lusso, Emanuele Nardini, Emma K. Lofthouse, Fabrizio Arrigoni Battaia, Francesco Haardt, Marc Rafelski, Matteo Fossati, Michele Fumagalli, Mitchell Revalski, Pratika Dayal, Stefano Cristiani, Valentina D'Odorico","submitted_at":"2023-08-24T18:00:03Z","abstract_excerpt":"We present the results obtained from follow-up observations of the MUSE Ultra Deep Field (MUDF) at X-ray energies with XMM-Newton. The MUDF is centred on a unique field with two bright, physically associated quasars at $z\\simeq3.23$, separated by $\\sim$500 kpc in projection. Both quasars are embedded within extended Ly$\\alpha$ nebulae ($\\gtrsim 100~\\rm kpc$ at a surface brightness flux level of $\\approx 6\\times 10^{-19} \\rm erg~s^{-1}~cm^{-2}~arcsec^{-2}$), whose elongated morphology is suggestive of an extended filament connecting the quasar haloes. The new X-ray observations presented here a"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2308.12993","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-08-24T18:00:03Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"a52155f711c6d13ee3ec4131ff48c4f5d37f17ea3a8f6cc0faf3d0daca36c98a","abstract_canon_sha256":"dba9c59293864d2f6cc0a32d3a8ded3cfb033fece5c41d14fffe50cfef5e39fb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:47:27.022492Z","signature_b64":"zvT5KFMQOwRKeVJbsQWTNeXEPIIxlyjkB2g6ONbIE1FJauVEY0aWhDNwHZNqQR2J0lOPk1mYQ/Nk7bfJVpMTBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"06032ae3daadb2eabc05a0c28c1f3cf97b4f331c35f03a78525cc5085156989e","last_reissued_at":"2026-07-05T06:47:27.021944Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:47:27.021944Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The MUSE Ultra Deep Field (MUDF). IV. A pair of X-ray weak quasars at the heart of two extended Ly{\\alpha} nebulae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"Celine Peroux, Elisabeta Lusso, Emanuele Nardini, Emma K. Lofthouse, Fabrizio Arrigoni Battaia, Francesco Haardt, Marc Rafelski, Matteo Fossati, Michele Fumagalli, Mitchell Revalski, Pratika Dayal, Stefano Cristiani, Valentina D'Odorico","submitted_at":"2023-08-24T18:00:03Z","abstract_excerpt":"We present the results obtained from follow-up observations of the MUSE Ultra Deep Field (MUDF) at X-ray energies with XMM-Newton. The MUDF is centred on a unique field with two bright, physically associated quasars at $z\\simeq3.23$, separated by $\\sim$500 kpc in projection. Both quasars are embedded within extended Ly$\\alpha$ nebulae ($\\gtrsim 100~\\rm kpc$ at a surface brightness flux level of $\\approx 6\\times 10^{-19} \\rm erg~s^{-1}~cm^{-2}~arcsec^{-2}$), whose elongated morphology is suggestive of an extended filament connecting the quasar haloes. The new X-ray observations presented here a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.12993","kind":"arxiv","version":2},"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/2308.12993/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2308.12993","created_at":"2026-07-05T06:47:27.022003+00:00"},{"alias_kind":"arxiv_version","alias_value":"2308.12993v2","created_at":"2026-07-05T06:47:27.022003+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.12993","created_at":"2026-07-05T06:47:27.022003+00:00"},{"alias_kind":"pith_short_12","alias_value":"AYBSVY62VWZO","created_at":"2026-07-05T06:47:27.022003+00:00"},{"alias_kind":"pith_short_16","alias_value":"AYBSVY62VWZOVPAF","created_at":"2026-07-05T06:47:27.022003+00:00"},{"alias_kind":"pith_short_8","alias_value":"AYBSVY62","created_at":"2026-07-05T06:47:27.022003+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F","json":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F.json","graph_json":"https://pith.science/api/pith-number/AYBSVY62VWZOVPAFUDBIYHZ47F/graph.json","events_json":"https://pith.science/api/pith-number/AYBSVY62VWZOVPAFUDBIYHZ47F/events.json","paper":"https://pith.science/paper/AYBSVY62"},"agent_actions":{"view_html":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F","download_json":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F.json","view_paper":"https://pith.science/paper/AYBSVY62","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2308.12993&json=true","fetch_graph":"https://pith.science/api/pith-number/AYBSVY62VWZOVPAFUDBIYHZ47F/graph.json","fetch_events":"https://pith.science/api/pith-number/AYBSVY62VWZOVPAFUDBIYHZ47F/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F/action/timestamp_anchor","attest_storage":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F/action/storage_attestation","attest_author":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F/action/author_attestation","sign_citation":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F/action/citation_signature","submit_replication":"https://pith.science/pith/AYBSVY62VWZOVPAFUDBIYHZ47F/action/replication_record"}},"created_at":"2026-07-05T06:47:27.022003+00:00","updated_at":"2026-07-05T06:47:27.022003+00:00"}