{"paper":{"title":"The mysterious $6565\\,\\AA$ absorption feature of the Galactic halo","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Biman B. Nath, Shiv K. Sethi, Yuri Shchekinov","submitted_at":"2017-11-01T18:00:06Z","abstract_excerpt":"We consider various possible scenarios to explain the recent observation of a claimed broad H$\\alpha$ absorption in our Galactic halo with peak optical depth $\\tau \\simeq 0.01$ and equivalent width $W \\simeq 0.17 \\, \\rm \\AA$. We show that the absorbed feature cannot arise from the circumgalactic and ISM H$\\alpha$ absorption. As the observed absorption feature is quite broad $\\Delta\\lambda \\simeq 30 \\, \\rm \\AA$, we also consider CNO lines that lie close to H$\\alpha$ as possible alternatives to explain the feature. We show such lines could also not account for the observed feature. Instead, we s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.00476","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"}