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We obtained a value $X_{\\rm CO} =1.85 \\pm 0.45 \\times 10^{20} {\\rm H_2 cm^{-2}/(K~ km~ s^{-1})}$ as the average of least-$chi^2$ fitting results for R4 (0.7 keV) and R5 (0.8 keV) bands.\n  Full resolution pdf available at http://www.ioa.s.u-tokyo.ac.jp/~sofue/htdocs/2016Xco/"},"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":"1603.04302","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-03-14T15:14:25Z","cross_cats_sorted":[],"title_canon_sha256":"caa7c7ae4b264c9f0a6b2708f10e6b6051935974fefc7d2ad2d042949c3b7a0a","abstract_canon_sha256":"be798c98954de1aac781941a5de51ee411bc81800f857ac0bbf403aca605ef37"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:13.706348Z","signature_b64":"838s9DCYEuwnVsM2ZbmF4I9ky7oiriHS85SMjhNKXFriuP4M5t7M2L2aBXohhFylcvVWt6blF7Z2BhYCh1pLCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a7b8c4b850ce05ff74c55ac26388d4e80450227d397d1666c6fc90a4ed27a15b","last_reissued_at":"2026-05-18T01:15:13.705679Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:13.705679Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"CO-to-H_2 Conversion Factor of Molecular Clouds using X-Ray Shadows","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Jun Kataoka, Yoshiaki SOFUE","submitted_at":"2016-03-14T15:14:25Z","abstract_excerpt":"A new method to determine the CO-to-H$_2$ conversion factor $X_{\\rm CO}$ using absorption of diffuse X-ray emission by local molecular clouds was developed. 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