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The spectra present a very deep silicate absorption at 9.7\\,$\\mu$m, and [S{\\sc\\,iv]}\\,10.5\\,$\\mu$m and [Ne{\\sc\\,ii]}\\,12.7\\,$\\mu$m ionic lines, but no evidence of PAH emission. We find that the nuclear optical extinction is in the range 24 $\\leq$ A$_{V}$ $\\leq$ 83\\,mag. A temperature T = 300\\,K was found for the black-body dust continuum component of the unresolved 65\\,pc nucleus and at 130\\,pc SE, while the regio"},"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":"1106.5731","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-06-28T17:24:44Z","cross_cats_sorted":[],"title_canon_sha256":"4427410d38e2d2e040d689c43450658bc22ed693cd85660c4d1bfbffe07e38d6","abstract_canon_sha256":"9ef4dd07e3ebd0f6641c99095efdf57c6ee2700f37c1671ec48f3fee73e810cb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:01:29.776802Z","signature_b64":"qcbP0Xu1xHzDYDWuMSuZWT8KFf7RCUFJX0xClQrCG9BjCo8bza4EvyZ11cGC52QnqHAmoHt3UyDpu/xg+kNQAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3aed624d1b22d04e05d582089fde26e36838aa255e8d593008b5f792c2a5a82f","last_reissued_at":"2026-05-18T02:01:29.776301Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:01:29.776301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Compton-Thick Seyfert 2 Nucleus of NGC3281: Torus Constraints from the 9.7$\\mu$m Silicate Absorption","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"A. C. Carciofi, A. Rodriguez-Ardila, C. Winge, Dinalva A. Sales, M. G. Pastoriza, R. Riffel","submitted_at":"2011-06-28T17:24:44Z","abstract_excerpt":"We present mid infrared (Mid-IR) spectra of the Compton-thick Seyfert 2 galaxy NGC\\,3281, obtained with the Thermal-Region Camera Spectrograph (T-ReCS) at the Gemini South telescope. The spectra present a very deep silicate absorption at 9.7\\,$\\mu$m, and [S{\\sc\\,iv]}\\,10.5\\,$\\mu$m and [Ne{\\sc\\,ii]}\\,12.7\\,$\\mu$m ionic lines, but no evidence of PAH emission. We find that the nuclear optical extinction is in the range 24 $\\leq$ A$_{V}$ $\\leq$ 83\\,mag. 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