{"paper":{"title":"RIOJA. JWST and ALMA unveil the inhomogeneous and complex ISM structure in a star-forming galaxy at $z=6.81$","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Akio K. Inoue, Alejandro Crespo G\\'omez, Carmen Blanco-Prieto, Daniel Ceverino, Hiroshi Matsuo, Javier \\'Alvarez-M\\'arquez, Ken Mawatari, Luca Costantin, Luis Colina, Masato Hagimoto, Miguel Pereira-Santaella, Mitsutaka Usui, Naoki Yoshida, Rui Marques-Chaves, Santiago Arribas, Takeshi Hashigaya, Takuya Hashimoto, Tom J. L. C. Bakx, Wataru Osone, Yi W. Ren, Yoichi Tamura, Yoshinobu Fudamoto, Yuma Sugahara, Yurina Nakazato","submitted_at":"2025-07-02T18:00:08Z","abstract_excerpt":"We report the discovery of a complex, density-stratified interstellar medium (ISM) in the star-forming galaxy COS-2987 at $z = 6.81$, revealed by the unprecedented synergy between JWST/NIRSpec IFS and ALMA observations. These observations detect key emission lines, including \\oii~$\\lambda\\lambda$~3727, 3730, \\oiii~4364, \\oiii~$\\lambda\\lambda$~4960, 5008, \\oiii\\ 88 \\micron, as well as H$\\alpha$ and H$\\beta$. JWST spectroscopy alone indicates ISM properties that are typical for galaxies at $z\\sim7$. These include low dust extinction ($A_{\\rm V} \\approx 0.14$ mag), moderate electron density ($n_{"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.02054","kind":"arxiv","version":2},"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/2507.02054/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"}