{"paper":{"title":"Mid-Infrared IRS Spectroscopy of NGC 7331: A First Look at the SINGS Legacy","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Li, B.T. Draine, C. Leitherer, C.W. Engelbracht, D.A. Dale, D. Calzetti, D.J. Hollenbach, E.J. Murphy, F. Walter, G. Helou, G.H. Rieke, G.J. Bendo, H. Roussel, J.D.T. Smith, Jr., K.D. Gordon, L. Armus, L. Kewley, M.D. Thornley, M.G. Wolfire, M.J. Meyer, M.J. Rieke, M.W. Regan, R.C. Kennicutt, S. Malhotra, T.H. Jarrett","submitted_at":"2004-06-14T21:32:38Z","abstract_excerpt":"The nearby spiral galaxy NGC 7331 was spectrally mapped from 5-38um using all modules of Spitzer's IRS spectrograph. A strong new dust emission feature, presumed due to PAHs, was discovered at 17.1um. The feature's intensity is nearly half that of the ubiquitous 11.3um band. The 7-14um spectral maps revealed significant variation in the 7.7 and 11.3um PAH features between the stellar ring and nucleus. Weak [OIV] 25.9um line emission was found to be centrally concentrated in the nucleus, with an observed strength over 10% of the combined neon line flux, indicating an AGN or unusually active mas"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0406332","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"}