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The X-ray image and temperature map show a cool 2-3 keV subcluster with a ram pressure stripped tail of gas just exiting the disrupted 6-7 keV primary cluster.  From the sharp jump in the temperature and density of the gas, we determine that the subcluster is preceded by a bow shock with a Mach number M=2.2+/-0.8, corresponding to a velocity v=2200^{+1000}_{-900} km/s relative to th"},"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":"1004.1559","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-04-09T14:11:47Z","cross_cats_sorted":[],"title_canon_sha256":"359059ed65bbb95b4aea834c30e639869d236c3b2ef306a7b0d7a0b1b5c6cc6d","abstract_canon_sha256":"69a8b5092b9ac50f7fb2ab18ea1cc60cb49b863036999a1de46ccd1025f3534d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:42:02.541834Z","signature_b64":"6cTpm9IViV0WTP5HWNrrjuRiIwYzVXTE0DVFPiZzCDRd2RjlO9h9uUWWWdBpScC7+rFA4jS5Q3TTSHlOUVkyAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"58ba7c60c1e38c1fa6d4062a04a94c172d6131b0b883806773ceb8c72ab40169","last_reissued_at":"2026-05-18T04:42:02.541350Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:42:02.541350Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Chandra observation of two shock fronts in the merging galaxy cluster Abell 2146","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A.C. 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