{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:KVLXKYTPTGFNBRUR3COYGQPTL2","short_pith_number":"pith:KVLXKYTP","canonical_record":{"source":{"id":"1401.5467","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-21T21:00:05Z","cross_cats_sorted":["astro-ph.CO","astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"03d1f1e4a41fc15f3280a3324ddc9e1033a152e18c7ea075b6fd3e64ba56b1c9","abstract_canon_sha256":"99baa72e7dea035a6a1fc11334f9be5b36e6fc1a51a5d5c937cd6a33ee27ac0c"},"schema_version":"1.0"},"canonical_sha256":"555775626f998ad0c691d89d8341f35e8d172d4ee735106ee73835e9bfc60621","source":{"kind":"arxiv","id":"1401.5467","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.5467","created_at":"2026-05-18T01:45:18Z"},{"alias_kind":"arxiv_version","alias_value":"1401.5467v1","created_at":"2026-05-18T01:45:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.5467","created_at":"2026-05-18T01:45:18Z"},{"alias_kind":"pith_short_12","alias_value":"KVLXKYTPTGFN","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_16","alias_value":"KVLXKYTPTGFNBRUR","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_8","alias_value":"KVLXKYTP","created_at":"2026-05-18T12:28:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:KVLXKYTPTGFNBRUR3COYGQPTL2","target":"record","payload":{"canonical_record":{"source":{"id":"1401.5467","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-21T21:00:05Z","cross_cats_sorted":["astro-ph.CO","astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"03d1f1e4a41fc15f3280a3324ddc9e1033a152e18c7ea075b6fd3e64ba56b1c9","abstract_canon_sha256":"99baa72e7dea035a6a1fc11334f9be5b36e6fc1a51a5d5c937cd6a33ee27ac0c"},"schema_version":"1.0"},"canonical_sha256":"555775626f998ad0c691d89d8341f35e8d172d4ee735106ee73835e9bfc60621","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:45:18.272662Z","signature_b64":"tW0sWiZA38xNo89xHfEseev23wcdbWu1N/p5uLMrJWwrv6710FJgmnXCm27sPn/NkVNHLXailVQEs3i6BX6KCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"555775626f998ad0c691d89d8341f35e8d172d4ee735106ee73835e9bfc60621","last_reissued_at":"2026-05-18T01:45:18.272170Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:45:18.272170Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.5467","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":"2026-05-18T01:45:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ojEwgmbhDDsjrsHHQFC2OwJSOOVVPbnHS9fADAa3+R/sTQ8/+sotPja11EU80j2OGu6NFGsDTcAGQ+QNwfFbBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:50:15.508983Z"},"content_sha256":"4da7deb0d8cc703eebf872cf2b46acd3cd58735a692168599642a8f9829e9f19","schema_version":"1.0","event_id":"sha256:4da7deb0d8cc703eebf872cf2b46acd3cd58735a692168599642a8f9829e9f19"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:KVLXKYTPTGFNBRUR3COYGQPTL2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First results from the Dragonfly Telephoto Array: the apparent lack of a stellar halo in the massive spiral galaxy M101","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.IM","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"Allison Merritt, Pieter van Dokkum, Roberto Abraham","submitted_at":"2014-01-21T21:00:05Z","abstract_excerpt":"We use a new telescope concept, the Dragonfly Telephoto Array, to study the low surface brightness outskirts of the spiral galaxy M101. The radial surface brightness profile is measured down to mu_g ~ 32 mag/arcsec^2, a depth that approaches the sensitivity of star count studies in the Local Group. We convert surface brightness to surface mass density using the radial g-r color profile. The mass density profile shows no significant upturn at large radius and is well-approximated by a simple bulge + disk model out to R = 70 kpc, corresponding to 18 disk scale lengths. Fitting a bulge + disk + h"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.5467","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":"2026-05-18T01:45:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fw1AB0S2k3y+H7XVTNhMMCeiFgY+ATl5/SpPuMC7StNvzUuzMpTc0ZPNkgaqlZuV4eQyy22QANIdWCkJbbIACw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:50:15.509349Z"},"content_sha256":"bf083f6274e57e83c1f2ba016aa5f995b00bdcf4a7ce4c14ed8c41a4c0e0643c","schema_version":"1.0","event_id":"sha256:bf083f6274e57e83c1f2ba016aa5f995b00bdcf4a7ce4c14ed8c41a4c0e0643c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KVLXKYTPTGFNBRUR3COYGQPTL2/bundle.json","state_url":"https://pith.science/pith/KVLXKYTPTGFNBRUR3COYGQPTL2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KVLXKYTPTGFNBRUR3COYGQPTL2/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":"2026-05-26T23:50:15Z","links":{"resolver":"https://pith.science/pith/KVLXKYTPTGFNBRUR3COYGQPTL2","bundle":"https://pith.science/pith/KVLXKYTPTGFNBRUR3COYGQPTL2/bundle.json","state":"https://pith.science/pith/KVLXKYTPTGFNBRUR3COYGQPTL2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KVLXKYTPTGFNBRUR3COYGQPTL2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:KVLXKYTPTGFNBRUR3COYGQPTL2","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":"99baa72e7dea035a6a1fc11334f9be5b36e6fc1a51a5d5c937cd6a33ee27ac0c","cross_cats_sorted":["astro-ph.CO","astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-21T21:00:05Z","title_canon_sha256":"03d1f1e4a41fc15f3280a3324ddc9e1033a152e18c7ea075b6fd3e64ba56b1c9"},"schema_version":"1.0","source":{"id":"1401.5467","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.5467","created_at":"2026-05-18T01:45:18Z"},{"alias_kind":"arxiv_version","alias_value":"1401.5467v1","created_at":"2026-05-18T01:45:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.5467","created_at":"2026-05-18T01:45:18Z"},{"alias_kind":"pith_short_12","alias_value":"KVLXKYTPTGFN","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_16","alias_value":"KVLXKYTPTGFNBRUR","created_at":"2026-05-18T12:28:35Z"},{"alias_kind":"pith_short_8","alias_value":"KVLXKYTP","created_at":"2026-05-18T12:28:35Z"}],"graph_snapshots":[{"event_id":"sha256:bf083f6274e57e83c1f2ba016aa5f995b00bdcf4a7ce4c14ed8c41a4c0e0643c","target":"graph","created_at":"2026-05-18T01:45:18Z","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 use a new telescope concept, the Dragonfly Telephoto Array, to study the low surface brightness outskirts of the spiral galaxy M101. The radial surface brightness profile is measured down to mu_g ~ 32 mag/arcsec^2, a depth that approaches the sensitivity of star count studies in the Local Group. We convert surface brightness to surface mass density using the radial g-r color profile. The mass density profile shows no significant upturn at large radius and is well-approximated by a simple bulge + disk model out to R = 70 kpc, corresponding to 18 disk scale lengths. Fitting a bulge + disk + h","authors_text":"Allison Merritt, Pieter van Dokkum, Roberto Abraham","cross_cats":["astro-ph.CO","astro-ph.IM","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-21T21:00:05Z","title":"First results from the Dragonfly Telephoto Array: the apparent lack of a stellar halo in the massive spiral galaxy M101"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.5467","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":"sha256:4da7deb0d8cc703eebf872cf2b46acd3cd58735a692168599642a8f9829e9f19","target":"record","created_at":"2026-05-18T01:45:18Z","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":"99baa72e7dea035a6a1fc11334f9be5b36e6fc1a51a5d5c937cd6a33ee27ac0c","cross_cats_sorted":["astro-ph.CO","astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-01-21T21:00:05Z","title_canon_sha256":"03d1f1e4a41fc15f3280a3324ddc9e1033a152e18c7ea075b6fd3e64ba56b1c9"},"schema_version":"1.0","source":{"id":"1401.5467","kind":"arxiv","version":1}},"canonical_sha256":"555775626f998ad0c691d89d8341f35e8d172d4ee735106ee73835e9bfc60621","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"555775626f998ad0c691d89d8341f35e8d172d4ee735106ee73835e9bfc60621","first_computed_at":"2026-05-18T01:45:18.272170Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:45:18.272170Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tW0sWiZA38xNo89xHfEseev23wcdbWu1N/p5uLMrJWwrv6710FJgmnXCm27sPn/NkVNHLXailVQEs3i6BX6KCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:45:18.272662Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.5467","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4da7deb0d8cc703eebf872cf2b46acd3cd58735a692168599642a8f9829e9f19","sha256:bf083f6274e57e83c1f2ba016aa5f995b00bdcf4a7ce4c14ed8c41a4c0e0643c"],"state_sha256":"1d158eb125950d53119bcf8a73e4817b6ebec31014db7fa7a652817acb0b3d34"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O6fLubbMHszMUWXEheaveXQfnSo0lBcVTW79ZveyVoTOvRMUm3YG0rwACtmamrqHdlHaabhNrBLBj11n1+paAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T23:50:15.516287Z","bundle_sha256":"9f8d9fb7b529049ee5d3fd4dac79d99588c5595959b35d2e715e57b06ae34457"}}