{"paper":{"title":"First rest-frame infrared spectrum of a z>7 quasar: JWST/MRS observations of J1120+0641","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Almudena Alonso-Herrero, Alvaro Labiano, Andreas Eckart, Arjan Bik, Bart Vandenbussche, Danial Langeroodi, Edoardo Iani, Ewine F. van Dishoeck, Fabian Walter, Florian Pei{\\ss}ker, Gillian Wright, G\\\"oran \\\"Ostlin, Iris Jermann, Javier \\'Alvarez-M\\'arquez, Jens Hjorth, Karina I. Caputi, Leindert Boogaard, Luca Costantin, Luis Colina, Macarena Garc\\'ia-Mar\\'in, Manuel G\\\"udel, Martin J. Ward, Martin Topinka, Olivier Ilbert, Paul van der Werf, Pierluigi Rinaldi, Pierre-Olivier Lagage, Sarah E. I. Bosman, Steven Gillman, Thomas Henning, Thomas R. Greve, Tom P. Ray","submitted_at":"2023-07-26T18:00:01Z","abstract_excerpt":"We present a JWST/MRS spectrum of the quasar J1120+0641 at z=7.0848, the first spectroscopic observation of a reionisation-era quasar in the rest-frame infrared ($0.6<\\lambda<3.4\\mu$m). In the context of the mysterious fast assembly of the first supermassive black holes at z>7, our observations enable for the first time the detection of hot torus dust, the H$\\alpha$ emission line, and the Paschen-series broad emission lines in a quasar at z>7. Hot torus dust is clearly detected as an upturn in the continuum emission at $\\lambda_{\\text{rest}}\\simeq1.3\\mu$m, leading to a black-body temperature o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2307.14414","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/2307.14414/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"}