{"paper":{"title":"The X/gamma-ray spectral properties of NGC 7172","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Felix Ryde, Juri Poutanen, Roland Svensson, Shiro Ueno, Stefan Larsson","submitted_at":"1997-01-22T16:14:28Z","abstract_excerpt":"We present a combined, non-simultaneous, ASCA GIS and CGRO OSSE spectrum of the Seyfert 2 galaxy, NGC 7172, and make broad band spectral fits. The only Seyfert 2 galaxy previously studied over such a broad band is NGC 4945. We find that the most probable model for the data is a power law with an exponential cut-off being affected by a neutral absorber. The best fit parameters are found to be $\\Gamma = 1.47 \\pm 0.15$ and $\\NH = (7.8 \\pm 0.6) 10^{22}$ cm$^{-2}$. The spectral index of the underlying power law of NGC 7172 has therefore varied from 1.8 to 1.5 since the Ginga observations in 1989. F"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9701169","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"}