{"OA_place":"publisher","DOAJ_listed":"1","year":"2026","publisher":"IOP Publishing","language":[{"iso":"eng"}],"volume":997,"project":[{"name":"Young galaxies as tracers and agents of cosmic reionization","_id":"bd9b2118-d553-11ed-ba76-db24564edfea","grant_number":"101076224"}],"fulldoi":"https://doi.org/10.3847/1538-4357/ae2799","file":[{"access_level":"open_access","date_created":"2026-10-14T08:09:31Z","success":1,"file_name":"2026_AstrophysicalJour_Kashino.pdf","date_updated":"2026-10-14T08:09:31Z","file_size":11393255,"checksum":"c33405da323cac352c0d751f0fe6f021","relation":"main_file","creator":"dernst","content_type":"application/pdf","file_id":"23138"}],"citation":{"apa":"Kashino, D., Lilly, S. J., Matthee, J. J., Mackenzie, R., Eilers, A.-C., Bordoloi, R., … Liu, B. (2026). EIGER. VII. The evolving relationship between galaxies and the intergalactic medium in the final stages of reionization. <i>The Astrophysical Journal</i>. IOP Publishing. <a href=\"https://doi.org/10.3847/1538-4357/ae2799\">https://doi.org/10.3847/1538-4357/ae2799</a>","mla":"Kashino, Daichi, et al. “EIGER. VII. The Evolving Relationship between Galaxies and the Intergalactic Medium in the Final Stages of Reionization.” <i>The Astrophysical Journal</i>, vol. 997, no. 2, 280, IOP Publishing, 2026, doi:<a href=\"https://doi.org/10.3847/1538-4357/ae2799\">10.3847/1538-4357/ae2799</a>.","short":"D. Kashino, S.J. Lilly, J.J. Matthee, R. Mackenzie, A.-C. Eilers, R. Bordoloi, R.A. Simcoe, R.P. Naidu, M. Yue, B. Liu, The Astrophysical Journal 997 (2026).","ieee":"D. Kashino <i>et al.</i>, “EIGER. VII. The evolving relationship between galaxies and the intergalactic medium in the final stages of reionization,” <i>The Astrophysical Journal</i>, vol. 997, no. 2. IOP Publishing, 2026.","ista":"Kashino D, Lilly SJ, Matthee JJ, Mackenzie R, Eilers A-C, Bordoloi R, Simcoe RA, Naidu RP, Yue M, Liu B. 2026. EIGER. VII. The evolving relationship between galaxies and the intergalactic medium in the final stages of reionization. The Astrophysical Journal. 997(2), 280.","ama":"Kashino D, Lilly SJ, Matthee JJ, et al. EIGER. VII. The evolving relationship between galaxies and the intergalactic medium in the final stages of reionization. <i>The Astrophysical Journal</i>. 2026;997(2). doi:<a href=\"https://doi.org/10.3847/1538-4357/ae2799\">10.3847/1538-4357/ae2799</a>","chicago":"Kashino, Daichi, Simon J. Lilly, Jorryt J Matthee, Ruari Mackenzie, Anna-Christina Eilers, Rongmon Bordoloi, Robert A. Simcoe, Rohan P. Naidu, Minghao Yue, and Bin Liu. “EIGER. VII. The Evolving Relationship between Galaxies and the Intergalactic Medium in the Final Stages of Reionization.” <i>The Astrophysical Journal</i>. IOP Publishing, 2026. <a href=\"https://doi.org/10.3847/1538-4357/ae2799\">https://doi.org/10.3847/1538-4357/ae2799</a>."},"scopus_import":"1","oa_version":"Published Version","department":[{"_id":"JoMa"}],"arxiv":1,"doi":"10.3847/1538-4357/ae2799","ddc":["520"],"has_accepted_license":"1","license":"https://creativecommons.org/licenses/by/4.0/","publication_status":"published","das_tickbox":"0","title":"EIGER. VII. The evolving relationship between galaxies and the intergalactic medium in the final stages of reionization","external_id":{"arxiv":["2506.03121"]},"publication":"The Astrophysical Journal","publication_identifier":{"issn":["0004-637X"],"eissn":["1538-4357"]},"article_number":"280","type":"journal_article","issue":"2","article_type":"original","author":[{"first_name":"Daichi","full_name":"Kashino, Daichi","last_name":"Kashino"},{"first_name":"Simon J.","full_name":"Lilly, Simon J.","last_name":"Lilly"},{"id":"7439a258-f3c0-11ec-9501-9df22fe06720","first_name":"Jorryt J","last_name":"Matthee","orcid":"0000-0003-2871-127X","full_name":"Matthee, Jorryt J"},{"full_name":"Mackenzie, Ruari","last_name":"Mackenzie","first_name":"Ruari"},{"first_name":"Anna-Christina","last_name":"Eilers","full_name":"Eilers, Anna-Christina"},{"last_name":"Bordoloi","full_name":"Bordoloi, Rongmon","first_name":"Rongmon"},{"first_name":"Robert A.","last_name":"Simcoe","full_name":"Simcoe, Robert A."},{"first_name":"Rohan P.","last_name":"Naidu","full_name":"Naidu, Rohan P."},{"first_name":"Minghao","full_name":"Yue, Minghao","last_name":"Yue"},{"first_name":"Bin","last_name":"Liu","full_name":"Liu, Bin"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_created":"2026-10-12T12:17:25Z","_id":"23117","status":"public","article_processing_charge":"Yes","supplementarymaterial":"yes","date_published":"2026-01-28T00:00:00Z","day":"28","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","short":"CC BY (4.0)","image":"/images/cc_by.png"},"quality_controlled":"1","oa":1,"PlanS_conform":"1","month":"01","date_updated":"2026-10-14T08:12:05Z","researchdata_availability":"no","OA_type":"gold","acknowledgement":"We thank Enrico Garaldi, Rahul Kannan, Aaron Smith, and the THESAN team for providing us with their simulation data, and Norbert Pirzkal for helpful advice on our NIRCam observing program.\r\n\r\nThis work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations were taken under GTO program No. 1243. The specific observations analyzed can be accessed via doi:10.17909/6grb-j154.\r\n\r\nThe participation of S.J.L. as an Interdisciplinary Scientist in the JWST Flight Science Working Group 2002-2022 has been supported by the European Space Agency. His earlier involvement in the development of the JWST 1996–2001 was supported by the Canadian Space Agency.\r\n\r\nThis work is partially based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 084.A-0360(A), 084.A-0390(A), 086.A-0162(A), 086.A-0574(A), 087.A-0607(A), 089.A-0814(A), 093.A-0707(A), 098.B-0537(A), and 286.A-5025(A). Some of the data presented herein were obtained at Keck Observatory, which is a private 501(c)3 nonprofit organization operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.\r\n\r\nThis work has been supported by JSPS KAKENHI grant No. JP21K13956 (D.K.). J.M. is supported by the European Union (ERC, AGENTS, 101076224).\r\n\r\nFacilities: JWST - James Webb Space Telescope (NIRCam), VLT:Kueyen - Very Large Telescope (Kueyen) (X-Shooter), Magellan:Baade - Magellan I Walter Baade Telescope (FIRE), Keck:I - KECK I Telescope (MOSFIRE), Keck:II - KECK II Telescope (ESI).\r\n\r\nSoftware: Python, numpy (C. R. Harris et al. 2020), scipy (P. Virtanen et al. 2020), Astropy (Astropy Collaboration et al. 2013), Matplotlib (J. D. Hunter 2007), PypeIt (J. X. Prochaska et al. 2019).","intvolume":"       997","abstract":[{"lang":"eng","text":"We present a comprehensive analysis of the relationship between galaxies and the intergalactic medium (IGM) during the late stages of cosmic reionization, based on the complete JWST EIGER dataset. Using deep NIRCam 3.5 μm slitless spectroscopy, we construct a sample of 948 [O iii]λ5008-emitting galaxies with −21.4 ≲ MUV ≲ −17.2 spanning 5.33 < z < 6.97 along six quasar sight lines. We correlate these galaxies with Lyα and Lyβ transmission measured from high-resolution quasar spectra across multiple redshift intervals. We find clear redshift evolution in the correlation between galaxy density and transmission: it is suppressed in overdense regions at z < 5.50, while enhanced at 5.70 < z < 6.15. The intermediate range exhibits a transitional behavior. Cross-correlation measurements further reveal excess absorption within ∼8 cMpc of galaxies at low redshifts, and enhanced transmission at intermediate scales (∼5–20 cMpc) at z > 5.70. Statistical tests using mock catalogs with realistic galaxy clustering but no correlation with the transmission field confirm that the observed correlations are unlikely to arise by chance. The evolving signals can be explained by stronger absorption in overdense regions, combined with the competing influences of local radiation fields and the rising background radiation. While local radiation dominates ionization of the surrounding IGM at earlier times, the background becomes increasingly important, eventually surpassing the impact of nearby galaxies. These results support an inside-out progression of reionization, with ionized regions originating around clustered, star-forming galaxies and gradually extending into underdense regions."}],"file_date_updated":"2026-10-14T08:09:31Z"}