{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:YWOAHNMIQK2Z4GUTZH7X45M7AN","short_pith_number":"pith:YWOAHNMI","canonical_record":{"source":{"id":"0909.5651","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-30T16:06:05Z","cross_cats_sorted":[],"title_canon_sha256":"ecd1aa3841d43bc40bdc37211aabbec09c0e750700812f78dd96036d9feb6ad7","abstract_canon_sha256":"f60cd2dd84bab571288207869345dd4d8b5b9e8b94793c89fdad576e4ef95c6d"},"schema_version":"1.0"},"canonical_sha256":"c59c03b58882b59e1a93c9ff7e759f035b9abdbb6d4a7b106020ce9734bc1a09","source":{"kind":"arxiv","id":"0909.5651","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.5651","created_at":"2026-05-18T02:11:35Z"},{"alias_kind":"arxiv_version","alias_value":"0909.5651v1","created_at":"2026-05-18T02:11:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.5651","created_at":"2026-05-18T02:11:35Z"},{"alias_kind":"pith_short_12","alias_value":"YWOAHNMIQK2Z","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"YWOAHNMIQK2Z4GUT","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"YWOAHNMI","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:YWOAHNMIQK2Z4GUTZH7X45M7AN","target":"record","payload":{"canonical_record":{"source":{"id":"0909.5651","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-30T16:06:05Z","cross_cats_sorted":[],"title_canon_sha256":"ecd1aa3841d43bc40bdc37211aabbec09c0e750700812f78dd96036d9feb6ad7","abstract_canon_sha256":"f60cd2dd84bab571288207869345dd4d8b5b9e8b94793c89fdad576e4ef95c6d"},"schema_version":"1.0"},"canonical_sha256":"c59c03b58882b59e1a93c9ff7e759f035b9abdbb6d4a7b106020ce9734bc1a09","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:35.851952Z","signature_b64":"qLk1JzNx//Bi2GYOeiZZ3aDpHj79VyM5X/uVlnOBbx12XxvntLOqEjCVvpsBcD46e4pOgI9KvlJjQPhG1vxxDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c59c03b58882b59e1a93c9ff7e759f035b9abdbb6d4a7b106020ce9734bc1a09","last_reissued_at":"2026-05-18T02:11:35.851161Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:35.851161Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0909.5651","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":"2026-05-18T02:11:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uPsg5q6jOgL5ua4TAcGQuUZnHqZWZhlmdYgCqRFBEJSzvqwGkz1UQ9sKG5d9l+BtTysJmioq2/enlVjvare2DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:00:28.960854Z"},"content_sha256":"daf27a1570c2ef5cec03cd43518720d2e6132433e06e5e3edec363c44ae9d0d1","schema_version":"1.0","event_id":"sha256:daf27a1570c2ef5cec03cd43518720d2e6132433e06e5e3edec363c44ae9d0d1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:YWOAHNMIQK2Z4GUTZH7X45M7AN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HI Observations of the Ca II absorbing galaxies Mrk 1456 and SDSS J211701.26-002633.7","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Brian Cherinka, Jessica Rosenberg, Regina Schulte-Ladbeck","submitted_at":"2009-09-30T16:06:05Z","abstract_excerpt":"In an effort to study Damped Lyman Alpha galaxies at low redshift, we have been using the Sloan Digital Sky Survey to identify galaxies projected onto QSO sightlines and to characterize their optical properties. For low redshift galaxies, the HI 21cm emission line can be used as an alternate tool for identifying possible DLA galaxies, since HI emitting galaxies typically exhibit HI columns that are larger than the classical DLA limit. Here we report on follow-up HI 21 cm emission line observations of two DLA candidates that are both low-redshift spiral galaxies, Mrk 1456 and SDSS J211701.26-00"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.5651","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":"2026-05-18T02:11:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"y1ak6ucXoCfxKsphDEEw91j5bVrK4/D7KEOtLW/UolCk5iqxCv+OpTp+HBpvQxfpDs8+hx6UKiVa1nA7cjMZBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T15:00:28.961203Z"},"content_sha256":"88d2aa5f39dd94fa5ada19820590e2c3d25c532761276a825e67021aca8a6493","schema_version":"1.0","event_id":"sha256:88d2aa5f39dd94fa5ada19820590e2c3d25c532761276a825e67021aca8a6493"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YWOAHNMIQK2Z4GUTZH7X45M7AN/bundle.json","state_url":"https://pith.science/pith/YWOAHNMIQK2Z4GUTZH7X45M7AN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YWOAHNMIQK2Z4GUTZH7X45M7AN/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":"2026-05-29T15:00:28Z","links":{"resolver":"https://pith.science/pith/YWOAHNMIQK2Z4GUTZH7X45M7AN","bundle":"https://pith.science/pith/YWOAHNMIQK2Z4GUTZH7X45M7AN/bundle.json","state":"https://pith.science/pith/YWOAHNMIQK2Z4GUTZH7X45M7AN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YWOAHNMIQK2Z4GUTZH7X45M7AN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:YWOAHNMIQK2Z4GUTZH7X45M7AN","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":"f60cd2dd84bab571288207869345dd4d8b5b9e8b94793c89fdad576e4ef95c6d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-30T16:06:05Z","title_canon_sha256":"ecd1aa3841d43bc40bdc37211aabbec09c0e750700812f78dd96036d9feb6ad7"},"schema_version":"1.0","source":{"id":"0909.5651","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.5651","created_at":"2026-05-18T02:11:35Z"},{"alias_kind":"arxiv_version","alias_value":"0909.5651v1","created_at":"2026-05-18T02:11:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.5651","created_at":"2026-05-18T02:11:35Z"},{"alias_kind":"pith_short_12","alias_value":"YWOAHNMIQK2Z","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"YWOAHNMIQK2Z4GUT","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"YWOAHNMI","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:88d2aa5f39dd94fa5ada19820590e2c3d25c532761276a825e67021aca8a6493","target":"graph","created_at":"2026-05-18T02:11:35Z","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":"In an effort to study Damped Lyman Alpha galaxies at low redshift, we have been using the Sloan Digital Sky Survey to identify galaxies projected onto QSO sightlines and to characterize their optical properties. For low redshift galaxies, the HI 21cm emission line can be used as an alternate tool for identifying possible DLA galaxies, since HI emitting galaxies typically exhibit HI columns that are larger than the classical DLA limit. Here we report on follow-up HI 21 cm emission line observations of two DLA candidates that are both low-redshift spiral galaxies, Mrk 1456 and SDSS J211701.26-00","authors_text":"Brian Cherinka, Jessica Rosenberg, Regina Schulte-Ladbeck","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-30T16:06:05Z","title":"HI Observations of the Ca II absorbing galaxies Mrk 1456 and SDSS J211701.26-002633.7"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.5651","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:daf27a1570c2ef5cec03cd43518720d2e6132433e06e5e3edec363c44ae9d0d1","target":"record","created_at":"2026-05-18T02:11:35Z","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":"f60cd2dd84bab571288207869345dd4d8b5b9e8b94793c89fdad576e4ef95c6d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-30T16:06:05Z","title_canon_sha256":"ecd1aa3841d43bc40bdc37211aabbec09c0e750700812f78dd96036d9feb6ad7"},"schema_version":"1.0","source":{"id":"0909.5651","kind":"arxiv","version":1}},"canonical_sha256":"c59c03b58882b59e1a93c9ff7e759f035b9abdbb6d4a7b106020ce9734bc1a09","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c59c03b58882b59e1a93c9ff7e759f035b9abdbb6d4a7b106020ce9734bc1a09","first_computed_at":"2026-05-18T02:11:35.851161Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:11:35.851161Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qLk1JzNx//Bi2GYOeiZZ3aDpHj79VyM5X/uVlnOBbx12XxvntLOqEjCVvpsBcD46e4pOgI9KvlJjQPhG1vxxDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:11:35.851952Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.5651","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:daf27a1570c2ef5cec03cd43518720d2e6132433e06e5e3edec363c44ae9d0d1","sha256:88d2aa5f39dd94fa5ada19820590e2c3d25c532761276a825e67021aca8a6493"],"state_sha256":"a0242faa647f3cb293fe9a4928559f5edb7942427a559362d57df51d5dba9ebb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7MYlr9vTcFEHgvimno9bZLwUPlbtXdcilseF7JgJKD4+AEWjlAVOezdeKGXptJDisrSo9JKfzz8tEWXT3HGlBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T15:00:28.963273Z","bundle_sha256":"a030122f87b108e00bc93b6edb54fa5485c6d4a877b0a04282e63022799a3b7a"}}