{"paper":{"title":"In Search of the First Stars: An Ultra-Compact and Very Low Metallicity Lyman-$\\alpha$ Emitter Deep Within the Epoch of Reionization","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Adam Muzzin, Anishya Harshan, Chris J. Willott, Gabe Brammer, Gael Noirot, Ghassan T. E. Sarrouh, Giordano Felicioni, Gregor Rihtarsic, Guillaume Desprez, Jacqueline Antwi-Danso, Jon Judez, Kartheik G. Iyer, Lamiya Mowla, Marcin Sawicki, Marusa Bradac, Nicholas S. Martis, Roberta Tripodi, Vladan Markov, Yoshihisa Asada","submitted_at":"2025-02-11T17:52:13Z","abstract_excerpt":"We present {\\it JWST} observations of a gravitationally-lensed, extremely metal-poor galaxy at redshift $z=8.203\\pm 0.001$ from the CANUCS survey. Based on the low oxygen to Balmer line ratios we infer a gas-phase metallicity of $12+{\\rm log(O/H)}=6.85$ (1.4\\% solar), making CANUCS-A370-z8-LAE one of the most metal-poor galaxies known at $z>7$. With a high H$\\beta$ equivalent width of $225\\pm50$\\,\\AA\\ and a half-light radius of only $r_{\\rm hl} = 38 ^{+3}_{-19} $\\,pc, the galaxy has a high star-formation-rate density of $50 - 100\\,M_{\\odot}$\\,yr$^{-1}$\\,kpc$^{-2}$. The galaxy shows high equiva"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.07733","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/2502.07733/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"}