{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:M7AMAR4D7CCMSC77IECKDJVFRU","short_pith_number":"pith:M7AMAR4D","schema_version":"1.0","canonical_sha256":"67c0c04783f884c90bff4104a1a6a58d2f05f2ac406026e013ebfdda348f15ed","source":{"kind":"arxiv","id":"1606.01255","version":1},"attestation_state":"computed","paper":{"title":"Applications for edge detection techniques using Chandra and XMM-Newton data: galaxy clusters and beyond","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A. C. Fabian, J. S. Sanders, S. A. Walker","submitted_at":"2016-06-03T20:00:07Z","abstract_excerpt":"The unrivalled spatial resolution of the Chandra X-ray observatory has allowed many breakthroughs to be made in high energy astrophysics. Here we explore applications of Gaussian Gradient Magnitude (GGM) filtering to X-ray data, which dramatically improves the clarity of surface brightness edges in X-ray observations, and maps gradients in X-ray surface brightness over a range of spatial scales. In galaxy clusters, we find that this method is able to reveal remarkable substructure behind the cold fronts in Abell 2142 and Abell 496, possibly the result of Kelvin Helmholtz instabilities. In Abel"},"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":"1606.01255","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-06-03T20:00:07Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"bc1aceb0e30e2db7a6a7e684797b432960f95c74a942d5f6b824d409377f838d","abstract_canon_sha256":"258659fdab8d135743a5eac026e705df1d7955de149a5d2e877c41666ef1f43f"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:10:29.308997Z","signature_b64":"89NK/w6s3onRNmZe8sf1D+MeH/GhYeVIE0lejSpRNDxp0hSpRPk8/Rq1L9ROHv+JBY2VMYp2jUhgjoUOpfJtBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"67c0c04783f884c90bff4104a1a6a58d2f05f2ac406026e013ebfdda348f15ed","last_reissued_at":"2026-05-18T01:10:29.308596Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:10:29.308596Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Applications for edge detection techniques using Chandra and XMM-Newton data: galaxy clusters and beyond","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A. C. Fabian, J. S. Sanders, S. A. Walker","submitted_at":"2016-06-03T20:00:07Z","abstract_excerpt":"The unrivalled spatial resolution of the Chandra X-ray observatory has allowed many breakthroughs to be made in high energy astrophysics. Here we explore applications of Gaussian Gradient Magnitude (GGM) filtering to X-ray data, which dramatically improves the clarity of surface brightness edges in X-ray observations, and maps gradients in X-ray surface brightness over a range of spatial scales. In galaxy clusters, we find that this method is able to reveal remarkable substructure behind the cold fronts in Abell 2142 and Abell 496, possibly the result of Kelvin Helmholtz instabilities. In Abel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1606.01255","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":"1606.01255","created_at":"2026-05-18T01:10:29.308658+00:00"},{"alias_kind":"arxiv_version","alias_value":"1606.01255v1","created_at":"2026-05-18T01:10:29.308658+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1606.01255","created_at":"2026-05-18T01:10:29.308658+00:00"},{"alias_kind":"pith_short_12","alias_value":"M7AMAR4D7CCM","created_at":"2026-05-18T12:30:29.479603+00:00"},{"alias_kind":"pith_short_16","alias_value":"M7AMAR4D7CCMSC77","created_at":"2026-05-18T12:30:29.479603+00:00"},{"alias_kind":"pith_short_8","alias_value":"M7AMAR4D","created_at":"2026-05-18T12:30:29.479603+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/M7AMAR4D7CCMSC77IECKDJVFRU","json":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU.json","graph_json":"https://pith.science/api/pith-number/M7AMAR4D7CCMSC77IECKDJVFRU/graph.json","events_json":"https://pith.science/api/pith-number/M7AMAR4D7CCMSC77IECKDJVFRU/events.json","paper":"https://pith.science/paper/M7AMAR4D"},"agent_actions":{"view_html":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU","download_json":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU.json","view_paper":"https://pith.science/paper/M7AMAR4D","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1606.01255&json=true","fetch_graph":"https://pith.science/api/pith-number/M7AMAR4D7CCMSC77IECKDJVFRU/graph.json","fetch_events":"https://pith.science/api/pith-number/M7AMAR4D7CCMSC77IECKDJVFRU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU/action/storage_attestation","attest_author":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU/action/author_attestation","sign_citation":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU/action/citation_signature","submit_replication":"https://pith.science/pith/M7AMAR4D7CCMSC77IECKDJVFRU/action/replication_record"}},"created_at":"2026-05-18T01:10:29.308658+00:00","updated_at":"2026-05-18T01:10:29.308658+00:00"}