{"paper":{"title":"Detection of the Galactic Warm Neutral Medium in HI 21cm absorption","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"(2) Indian Institute of Science, India, India], Jayaram N. Chengalur (1), Narendra Nath Patra (1), Nirupam Roy (2) [(1) National Centre for Radio Astrophysics, Nissim Kanekar (1)","submitted_at":"2018-05-24T18:53:14Z","abstract_excerpt":"We report a deep Giant Metrewave Radio Telescope (GMRT) search for Galactic H{\\sc i} 21cm absorption towards the quasar B0438$-$436, yielding the detection of wide, weak H{\\sc i} 21cm absorption, with a velocity-integrated H{\\sc i} 21cm optical depth of $0.0188 \\pm 0.0036$~km~s$^{-1}$. Comparing this with the H{\\sc i} column density measured in the Parkes Galactic All-Sky Survey gives a column density-weighted harmonic mean spin temperature of $3760 \\pm 365$~K, one of the highest measured in the Galaxy. This is consistent with most of the H{\\sc i} along the sightline arising in the stable warm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.09851","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"}