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We derive physical properties such as the optical depths and the column densities of $^{13}$CO and C$^{18}$O to investigate the relationship between the far ultraviolet (FUV) radiation and the abundance ratios between $^{13}$CO and C$^{18}$O.\n  Method. We have carried out wide-field (0.4 deg$^2$) observations with an angular resolution of 25.8 arcsec ($\\sim$ 0.05 pc) in $^{13}$CO ($J$=1--0) and C$^{18}$O ($J$=1--0) toward the Orion-A giant molecular cloud using the Nobeyama 45 m telescope in the on-the-fly mode.\n  Results. Overall distributions and velocity structures of the $^{13}$CO an"},"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":"1403.2930","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-03-12T13:44:20Z","cross_cats_sorted":[],"title_canon_sha256":"0380bce38c159fea07f0650269a2328b97560ed1e62c0eef27352e1bf420b0a6","abstract_canon_sha256":"e90ac90afbe4985fd04183436277dd967a7050a5e3f08d1a6a9c37bec74a193b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:52:25.436403Z","signature_b64":"O3l7qzUso9gZkY0/cQDI36aNIZUvltn4XRsAQsoF7E7WI0h1sECvLggzLl2yENptCGsAMEEDluSHPpoEOictBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dac3c62d9ff17e8bfcce04d62bb17de98cf0fc321272f2babf91561240e8f0c3","last_reissued_at":"2026-05-18T02:52:25.435627Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:52:25.435627Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"High abundance ratio of $^{13}$CO to C$^{18}$O toward photon-dominated regions in the Orion-A giant molecular cloud","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Akifumi Yamabi, Chihomi Hara, Fumitaka Nakamura, Hiroyuki Nishitani, Kazuhito Dobashi, Masao Saito, Munetake Momose, Ryohei Kawabe, Sho Katakura, Takashi Tsukagoshi, Tomohiro Tanaka, Tomomi Shimoikura, Yoshimi Kitamura, Yoshito Shimajiri","submitted_at":"2014-03-12T13:44:20Z","abstract_excerpt":"Aims. We derive physical properties such as the optical depths and the column densities of $^{13}$CO and C$^{18}$O to investigate the relationship between the far ultraviolet (FUV) radiation and the abundance ratios between $^{13}$CO and C$^{18}$O.\n  Method. We have carried out wide-field (0.4 deg$^2$) observations with an angular resolution of 25.8 arcsec ($\\sim$ 0.05 pc) in $^{13}$CO ($J$=1--0) and C$^{18}$O ($J$=1--0) toward the Orion-A giant molecular cloud using the Nobeyama 45 m telescope in the on-the-fly mode.\n  Results. 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