{"paper":{"title":"The first identification of Lyman $\\alpha$ Changing-look Quasars at high-redshift in DESI","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Aaron Meisner, Adam Myers, Andrea Mu\\~noz-Guti\\'errez, Andrew Lambert, Axel de la Macorra, Benjamin Alan Weaver, Claire Poppett, David Brooks, Davide Bianchi, David Sprayberry, Enrique Gazta\\~naga, Eusebio Sanchez, Francisco Prada, Graziano Rossi, Gregory Tarl\\'e, Hee-Jong Seo, Hu Zou, Jaime E. Forero-Romero, Jessica Nicole Aguilar, John Moustakas, Joseph Harry Silber, Jundan Nie, Kevin Fanning, Klaus Honscheid, Kyle Dawson, Laurent Le Guillou, Ma{\\l}gorzata Siudek, Marc Manera, Martin Landriau, Mehdi Rezaie, Michael Schubnelll, Nathalie Palanque-Delabrouille, Peter Doel, Robert Kehoe, Satya Gontcho A Gontcho, Steven Ahlen, Theodore Kisner, Todd Claybaugh, Wei-Jian Guo, Zhimin Zhou, Zhiwei Pan","submitted_at":"2024-11-04T10:21:28Z","abstract_excerpt":"We present two cases of Ly$\\alpha$ changing-look (CL) quasars (J1306 and J1512) along with two additional candidates (J1511 and J1602), all discovered serendipitously at $z >2$ through the Dark Energy Spectroscopic Instrument (DESI) and the Sloan Digital Sky Survey (SDSS). It is the first time to capture CL events in Ly$\\alpha$ at high redshift, which is crucial for understanding underlying mechanisms driving the CL phenomenon and the evolution of high-redshift quasars and galaxies. The variability of all four sources is confirmed by the significant change of amplitude in the $r$ band ($|r_{\\r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2411.01949","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/2411.01949/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"}