{"paper":{"title":"ATLAS. II. Extremely High Incidence of Balmer Line Absorption with Predominant Blueshifts in LRDs: Statistical Insights through Comparison with Type 1 AGNs","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Hiroto Yanagisawa, Makoto Ando, Masami Ouchi, Minami Nakane, Tomokazu Kiyota, Yoshiaki Ono, Yuichi Harikane, Yui Takeda, Yuta Kageura","submitted_at":"2026-07-28T21:01:17Z","abstract_excerpt":"We present the statistical properties of H$\\alpha$ and H$\\beta$ line absorption in little red dots (LRDs) at $z\\simeq2.5$--7.2 using archival JWST/NIRSpec spectra from the DAWN JWST Archive and complementary NIRSpec/IFU observations. Among 40 LRDs with broad H$\\alpha$ and [O~{\\sc iii}] obtained with medium- or high-resolution gratings, 14 objects exhibit H$\\alpha$ absorption. We find that the incidence of Balmer line absorption is $\\sim35$\\% ($=14/40$), significantly higher than that in SDSS low-$z$ type 1 AGNs ($\\sim0.04$\\%), demonstrating that Balmer line absorption occurs approximately 850 "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.26269","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.26269/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}