{"paper":{"title":"DeepDive: A deep dive into the physics of the first massive quiescent galaxies in the Universe","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Gallazzi, A. L. Faisst, C. K. Jespersen, D. Ceverino, F. Valentino, G. Brammer, G. Magdis, J. Antwi-Danso, J. R Weaver, K. E. Heintz, K. E. Whitaker, K. Ito, M. Farcy, M. Hirschmann, M. Kubo, M. Lee, M. L. Hamadouche, M. Onodera, M. Tanaka, P.-F. Wu, P. Zhu, R. Gottumukkala, R. Shimakawa, S. Fujimoto, S. Gillman, S. Toft, T. Kakimoto, V. Kokorev, W. M. Baker","submitted_at":"2025-06-27T21:13:30Z","abstract_excerpt":"We present the DeepDive program, in which we obtained deep ($1-3$ hours) JWST/NIRSpec G235M/F170LP spectra for 10 primary massive ($\\log{(M_\\star/M_\\odot)}=10.8-11.5$) quiescent galaxies at $z\\sim3-4$. A novel reduction procedure extends the nominal wavelength coverage of G235M beyond H$\\alpha$ and [NII] at $z\\sim4$, revealing weak, narrow H$\\alpha$ lines indicative of low star formation rates (${\\rm SFR}\\sim0-5\\, M_\\odot\\, {\\rm yr^{-1}}$). Two out of 10 primary targets have broad H$\\alpha$ lines, indicating the presence of AGNs. We also conduct an archival search of quiescent galaxies observe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.22642","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/2506.22642/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"}