{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2009:LQAJWTS4HCQPX7XOKXNFWPLFC7","short_pith_number":"pith:LQAJWTS4","schema_version":"1.0","canonical_sha256":"5c009b4e5c38a0fbfeee55da5b3d6517ceb236918dd74826c694535a6c3c541d","source":{"kind":"arxiv","id":"0909.4900","version":1},"attestation_state":"computed","paper":{"title":"Hubble Space Telescope Survey of Interstellar High-Velocity Si III","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"(2) East Tennessee State University), Joseph A. Collins (1), Mark L. Giroux (2) ((1) University of Colorado, Michael Shull (1)","submitted_at":"2009-09-26T22:30:55Z","abstract_excerpt":"We describe an ultraviolet spectroscopic survey of interstellar high-velocity cloud (HVC) absorption in the strong 1206.500 Angstrom line of Si III using the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope. Because the Si III line is 4-5 times stronger than O VI 1031.926, it provides a sensitive probe of ionized gas down to column densities N(Si III) = 5x10^11 cm^-2 at Si III equivalent width 10 mA. We detect high-velocity Si III over (91+/-4)% of the sky (53 of 58 sight lines), and 59% of the HVCs show negative LSR velocities. Per sight line, the mean HVC column density"},"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":"0909.4900","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-09-26T22:30:55Z","cross_cats_sorted":[],"title_canon_sha256":"de484c2d8a9d3e2e76fcc878fe011c34ecb0026a2bb265760b201478671d5036","abstract_canon_sha256":"6167881b1d51daa77d6d6627076a1a8e61c76f696ca8ab45dd6ad6816b241c56"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:11:37.254524Z","signature_b64":"yMvb07uF7tZQ9mzfWloBvgpzur7nqxJKnogYKABOyRyfip1Pdf1/WqOUZ5PA8kg5sllSeiYYfaM4sARdHq4eCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5c009b4e5c38a0fbfeee55da5b3d6517ceb236918dd74826c694535a6c3c541d","last_reissued_at":"2026-05-18T02:11:37.253851Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:11:37.253851Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Hubble Space Telescope Survey of Interstellar High-Velocity Si III","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"(2) East Tennessee State University), Joseph A. Collins (1), Mark L. Giroux (2) ((1) University of Colorado, Michael Shull (1)","submitted_at":"2009-09-26T22:30:55Z","abstract_excerpt":"We describe an ultraviolet spectroscopic survey of interstellar high-velocity cloud (HVC) absorption in the strong 1206.500 Angstrom line of Si III using the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope. Because the Si III line is 4-5 times stronger than O VI 1031.926, it provides a sensitive probe of ionized gas down to column densities N(Si III) = 5x10^11 cm^-2 at Si III equivalent width 10 mA. We detect high-velocity Si III over (91+/-4)% of the sky (53 of 58 sight lines), and 59% of the HVCs show negative LSR velocities. Per sight line, the mean HVC column density"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.4900","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"0909.4900","created_at":"2026-05-18T02:11:37.253979+00:00"},{"alias_kind":"arxiv_version","alias_value":"0909.4900v1","created_at":"2026-05-18T02:11:37.253979+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.4900","created_at":"2026-05-18T02:11:37.253979+00:00"},{"alias_kind":"pith_short_12","alias_value":"LQAJWTS4HCQP","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_16","alias_value":"LQAJWTS4HCQPX7XO","created_at":"2026-05-18T12:26:00.592388+00:00"},{"alias_kind":"pith_short_8","alias_value":"LQAJWTS4","created_at":"2026-05-18T12:26:00.592388+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/LQAJWTS4HCQPX7XOKXNFWPLFC7","json":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7.json","graph_json":"https://pith.science/api/pith-number/LQAJWTS4HCQPX7XOKXNFWPLFC7/graph.json","events_json":"https://pith.science/api/pith-number/LQAJWTS4HCQPX7XOKXNFWPLFC7/events.json","paper":"https://pith.science/paper/LQAJWTS4"},"agent_actions":{"view_html":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7","download_json":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7.json","view_paper":"https://pith.science/paper/LQAJWTS4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=0909.4900&json=true","fetch_graph":"https://pith.science/api/pith-number/LQAJWTS4HCQPX7XOKXNFWPLFC7/graph.json","fetch_events":"https://pith.science/api/pith-number/LQAJWTS4HCQPX7XOKXNFWPLFC7/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7/action/storage_attestation","attest_author":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7/action/author_attestation","sign_citation":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7/action/citation_signature","submit_replication":"https://pith.science/pith/LQAJWTS4HCQPX7XOKXNFWPLFC7/action/replication_record"}},"created_at":"2026-05-18T02:11:37.253979+00:00","updated_at":"2026-05-18T02:11:37.253979+00:00"}