{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:FOE336GIPCOY2QFOOUDHFGPC55","short_pith_number":"pith:FOE336GI","canonical_record":{"source":{"id":"2507.01362","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-07-02T05:00:59Z","cross_cats_sorted":[],"title_canon_sha256":"5de148ed2f66ce4e9412965f41973e130abe545d8fe7b963168b47258bb9a498","abstract_canon_sha256":"9a4e8e2f826394435ebf75b99f3e69ef2753574e6b6d3227f06c3650b7793a64"},"schema_version":"1.0"},"canonical_sha256":"2b89bdf8c8789d8d40ae75067299e2ef4c8b6293c74b13a917115b519c622f33","source":{"kind":"arxiv","id":"2507.01362","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.01362","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"arxiv_version","alias_value":"2507.01362v1","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.01362","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"pith_short_12","alias_value":"FOE336GIPCOY","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"pith_short_16","alias_value":"FOE336GIPCOY2QFO","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"pith_short_8","alias_value":"FOE336GI","created_at":"2026-07-05T11:56:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:FOE336GIPCOY2QFOOUDHFGPC55","target":"record","payload":{"canonical_record":{"source":{"id":"2507.01362","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-07-02T05:00:59Z","cross_cats_sorted":[],"title_canon_sha256":"5de148ed2f66ce4e9412965f41973e130abe545d8fe7b963168b47258bb9a498","abstract_canon_sha256":"9a4e8e2f826394435ebf75b99f3e69ef2753574e6b6d3227f06c3650b7793a64"},"schema_version":"1.0"},"canonical_sha256":"2b89bdf8c8789d8d40ae75067299e2ef4c8b6293c74b13a917115b519c622f33","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:56:05.086127Z","signature_b64":"5qsKD10yiqDticc/xt5UpYDJGf94yoto1J+F1Z2Nev5q04SK/dMaQPIN4Rxvw02PrL6RRZBLiKH9pzwPG/ozDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2b89bdf8c8789d8d40ae75067299e2ef4c8b6293c74b13a917115b519c622f33","last_reissued_at":"2026-07-05T11:56:05.085689Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:56:05.085689Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.01362","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":"2026-07-05T11:56:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2ZrSmdxD9E+vZ/vHuW0VTnNVk71AGRwEocvX0DD4c9kXWrq0jI3Hs2xBKcfaXkFcMJlNvr9Ie5jkqsmDdzuvCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T22:23:39.178512Z"},"content_sha256":"1d6a4553fe8215cb178a7d720c68cc2d070b99827ebfdb8932f0ecb8600e33c6","schema_version":"1.0","event_id":"sha256:1d6a4553fe8215cb178a7d720c68cc2d070b99827ebfdb8932f0ecb8600e33c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:FOE336GIPCOY2QFOOUDHFGPC55","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Radial velocities and stellar populations for a sample of MATLAS survey dwarfs","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aaron J. Romanowsky, Arsen Levitskiy, Duncan A. Forbes, Jean P. Brodie, Jonah S. Gannon, Kate Southon, Maria Luisa Buzzo","submitted_at":"2025-07-02T05:00:59Z","abstract_excerpt":"Spectroscopic observations are essential for confirming associations, measuring kinematics, and determining stellar populations in dwarf galaxies. Here, we present Keck Cosmic Web Imager (KCWI) spectra for 12 MATLAS survey dwarfs. For 9, we confirm recession velocities consistent with their literature-assumed host galaxies. We propose revisions of the host galaxy associations for MATLAS-631, 1494, and 1938. For MATLAS-1494, our measured redshift reclassifies it from an ultra-diffuse galaxy candidate to a dwarf galaxy that is of smaller physical size and places it in the field. It also appears "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.01362","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/2507.01362/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":"2026-07-05T11:56:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KEqI/y9xkaSDTQ4oTQKTRWY1VFK6s052BT/Tnr51+BdoP+rs0ct4JKYZ36vMptCM+1KZxwgaKi//7jSCFs6oBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T22:23:39.187330Z"},"content_sha256":"3fcfe28c7d103e4511a41091e443823e597dc4521a6f4a6e1bf7c14d5cbef017","schema_version":"1.0","event_id":"sha256:3fcfe28c7d103e4511a41091e443823e597dc4521a6f4a6e1bf7c14d5cbef017"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FOE336GIPCOY2QFOOUDHFGPC55/bundle.json","state_url":"https://pith.science/pith/FOE336GIPCOY2QFOOUDHFGPC55/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FOE336GIPCOY2QFOOUDHFGPC55/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":"2026-08-17T22:23:39Z","links":{"resolver":"https://pith.science/pith/FOE336GIPCOY2QFOOUDHFGPC55","bundle":"https://pith.science/pith/FOE336GIPCOY2QFOOUDHFGPC55/bundle.json","state":"https://pith.science/pith/FOE336GIPCOY2QFOOUDHFGPC55/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FOE336GIPCOY2QFOOUDHFGPC55/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:FOE336GIPCOY2QFOOUDHFGPC55","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":"9a4e8e2f826394435ebf75b99f3e69ef2753574e6b6d3227f06c3650b7793a64","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-07-02T05:00:59Z","title_canon_sha256":"5de148ed2f66ce4e9412965f41973e130abe545d8fe7b963168b47258bb9a498"},"schema_version":"1.0","source":{"id":"2507.01362","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.01362","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"arxiv_version","alias_value":"2507.01362v1","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.01362","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"pith_short_12","alias_value":"FOE336GIPCOY","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"pith_short_16","alias_value":"FOE336GIPCOY2QFO","created_at":"2026-07-05T11:56:05Z"},{"alias_kind":"pith_short_8","alias_value":"FOE336GI","created_at":"2026-07-05T11:56:05Z"}],"graph_snapshots":[{"event_id":"sha256:3fcfe28c7d103e4511a41091e443823e597dc4521a6f4a6e1bf7c14d5cbef017","target":"graph","created_at":"2026-07-05T11:56:05Z","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/2507.01362/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Spectroscopic observations are essential for confirming associations, measuring kinematics, and determining stellar populations in dwarf galaxies. Here, we present Keck Cosmic Web Imager (KCWI) spectra for 12 MATLAS survey dwarfs. For 9, we confirm recession velocities consistent with their literature-assumed host galaxies. We propose revisions of the host galaxy associations for MATLAS-631, 1494, and 1938. For MATLAS-1494, our measured redshift reclassifies it from an ultra-diffuse galaxy candidate to a dwarf galaxy that is of smaller physical size and places it in the field. It also appears ","authors_text":"Aaron J. Romanowsky, Arsen Levitskiy, Duncan A. Forbes, Jean P. Brodie, Jonah S. Gannon, Kate Southon, Maria Luisa Buzzo","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-07-02T05:00:59Z","title":"Radial velocities and stellar populations for a sample of MATLAS survey dwarfs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.01362","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":"sha256:1d6a4553fe8215cb178a7d720c68cc2d070b99827ebfdb8932f0ecb8600e33c6","target":"record","created_at":"2026-07-05T11:56:05Z","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":"9a4e8e2f826394435ebf75b99f3e69ef2753574e6b6d3227f06c3650b7793a64","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-07-02T05:00:59Z","title_canon_sha256":"5de148ed2f66ce4e9412965f41973e130abe545d8fe7b963168b47258bb9a498"},"schema_version":"1.0","source":{"id":"2507.01362","kind":"arxiv","version":1}},"canonical_sha256":"2b89bdf8c8789d8d40ae75067299e2ef4c8b6293c74b13a917115b519c622f33","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2b89bdf8c8789d8d40ae75067299e2ef4c8b6293c74b13a917115b519c622f33","first_computed_at":"2026-07-05T11:56:05.085689Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:56:05.085689Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5qsKD10yiqDticc/xt5UpYDJGf94yoto1J+F1Z2Nev5q04SK/dMaQPIN4Rxvw02PrL6RRZBLiKH9pzwPG/ozDw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:56:05.086127Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.01362","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d6a4553fe8215cb178a7d720c68cc2d070b99827ebfdb8932f0ecb8600e33c6","sha256:3fcfe28c7d103e4511a41091e443823e597dc4521a6f4a6e1bf7c14d5cbef017"],"state_sha256":"2849a4bf433189dbc48ad2371eb24411fc14a88bbb48f59a3c5d5b1c7f9486ec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"16IHGvDUqaIh8c6Yg33SJsAR8JnBGZ61lXOjamyXjP2uhWolstO7gEIPBQBzOXR9Bm4q0HW7Uk/I5yfcoTmwCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T22:23:39.198379Z","bundle_sha256":"bd0072e9b893c907818e731b13c0498a9acfa2225bed1d9ad1c5095c2c88bef4"}}