{"publication":"The Astrophysical Journal","date_updated":"2026-04-13T08:30:52Z","file_date_updated":"2026-04-13T08:20:16Z","scopus_import":"1","issue":"1","DOAJ_listed":"1","status":"public","PlanS_conform":"1","has_accepted_license":"1","citation":{"chicago":"Lee, Max E., Zoltán Haiman, Shivam Pandey, and Shy Genel. “The Effect of Intrinsic Alignments on Weak-Lensing Statistics in Hydrodynamical Simulations.” <i>The Astrophysical Journal</i>. IOP Publishing, 2025. <a href=\"https://doi.org/10.3847/1538-4357/ae1ca7\">https://doi.org/10.3847/1538-4357/ae1ca7</a>.","ista":"Lee ME, Haiman Z, Pandey S, Genel S. 2025. The effect of intrinsic alignments on weak-lensing statistics in hydrodynamical simulations. The Astrophysical Journal. 996(1), 36.","ama":"Lee ME, Haiman Z, Pandey S, Genel S. The effect of intrinsic alignments on weak-lensing statistics in hydrodynamical simulations. <i>The Astrophysical Journal</i>. 2025;996(1). doi:<a href=\"https://doi.org/10.3847/1538-4357/ae1ca7\">10.3847/1538-4357/ae1ca7</a>","apa":"Lee, M. E., Haiman, Z., Pandey, S., &#38; Genel, S. (2025). The effect of intrinsic alignments on weak-lensing statistics in hydrodynamical simulations. <i>The Astrophysical Journal</i>. IOP Publishing. <a href=\"https://doi.org/10.3847/1538-4357/ae1ca7\">https://doi.org/10.3847/1538-4357/ae1ca7</a>","short":"M.E. Lee, Z. Haiman, S. Pandey, S. Genel, The Astrophysical Journal 996 (2025).","ieee":"M. E. Lee, Z. Haiman, S. Pandey, and S. Genel, “The effect of intrinsic alignments on weak-lensing statistics in hydrodynamical simulations,” <i>The Astrophysical Journal</i>, vol. 996, no. 1. IOP Publishing, 2025.","mla":"Lee, Max E., et al. “The Effect of Intrinsic Alignments on Weak-Lensing Statistics in Hydrodynamical Simulations.” <i>The Astrophysical Journal</i>, vol. 996, no. 1, 36, IOP Publishing, 2025, doi:<a href=\"https://doi.org/10.3847/1538-4357/ae1ca7\">10.3847/1538-4357/ae1ca7</a>."},"day":"23","type":"journal_article","quality_controlled":"1","_id":"21724","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"The next generation of weak-gravitational-lensing surveys has the potential to place stringent constraints on cosmological parameters. However, their analysis is limited by systematics such as the intrinsic alignments of galaxies, which alter weak-lensing convergence and can lead to biases in cosmological parameter estimations. For the first time, in this work, we investigate the impact of intrinsic alignments on non-Gaussian statistics of the weak-lensing field using galaxy shapes derived from the IllustrisTNG hydrodynamical simulation. We create two catalogs of ray-traced convergence maps: one that includes the measured intrinsic shape of each galaxy and another where all galaxies are randomly rotated to eliminate intrinsic alignments. We compare a range of weak-lensing statistics between the two catalogs, including the shear–shear correlation function, the map-level angular power spectrum, one-point, peak count, and minimum distribution functions, and Minkowski functionals. For each statistic, we assess the level of statistical distinguishability between catalogs for a set of future survey angular areas. Our results reveal strong small-scale correlation in the alignment of galaxies and statistically significant boosts in weak-lensing convergence in both positive and negative directions for high-significance peaks and minima, respectively. We note that our analysis is at a fixed number density of  ˜ 5 arcmin^-2, drawn from a single realization of initial conditions, and does not include observational uncertainties or supersample covariance contributions. Weak-lensing analyses utilizing non-Gaussian statistics must account for intrinsic alignments to avoid significantly compromised cosmological inferences."}],"external_id":{"arxiv":["2504.12460"]},"date_published":"2025-12-23T00:00:00Z","OA_place":"publisher","year":"2025","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","ddc":["520"],"article_number":"36","intvolume":"       996","article_type":"original","department":[{"_id":"ZoHa"}],"month":"12","volume":996,"author":[{"last_name":"Lee","full_name":"Lee, Max E.","first_name":"Max E."},{"full_name":"Haiman, Zoltán","last_name":"Haiman","first_name":"Zoltán","id":"7c006e8c-cc0d-11ee-8322-cb904ef76f36","orcid":"0000-0003-3633-5403"},{"last_name":"Pandey","full_name":"Pandey, Shivam","first_name":"Shivam"},{"full_name":"Genel, Shy","last_name":"Genel","first_name":"Shy"}],"acknowledgement":"We thank Fulvio Ferlito, Ana Maria Delgado, and Ken Osato for helpful conversations during this work. M.E.L. is supported by NSF grant DGE-2036197. Z.H. acknowledges financial support from NASA ATP grant 80NSSC24K1093. The Flatiron Institute is supported by the Simons Foundation.","oa":1,"doi":"10.3847/1538-4357/ae1ca7","publisher":"IOP Publishing","tmp":{"short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"article_processing_charge":"Yes","file":[{"access_level":"open_access","success":1,"content_type":"application/pdf","file_size":4122087,"date_created":"2026-04-13T08:20:16Z","checksum":"0d8fa05617420230eac39944b36839e9","file_name":"2025_AstrophysicalJournal_Lee.pdf","date_updated":"2026-04-13T08:20:16Z","relation":"main_file","file_id":"21732","creator":"dernst"}],"publication_status":"published","oa_version":"Published Version","OA_type":"gold","date_created":"2026-04-12T22:01:52Z","title":"The effect of intrinsic alignments on weak-lensing statistics in hydrodynamical simulations","arxiv":1,"publication_identifier":{"eissn":["1538-4357"],"issn":["0004-637X"]}}