Baryon Pasting the Uchuu Light-cone Simulation

Baryon Pasting the Uchuu Light-cone Simulation. Lau, E. T., Nagai, D., Farahi, A., Ishiyama, T., Miyatake, H., Osato, K., & Shirasaki, M. The Astrophysical Journal, 980(1):122, February, 2025.

Paper doi abstract bibtex

We present the Baryon Pasted (BP) X-ray and thermal Sunyaev–Zel’dovich (tSZ) maps derived from the half-sky Uchuu light-cone simulation. These BP-Uchuu maps are constructed using more than 75 million dark matter halos with masses M500c 1013 Me within the redshift range 0 z 2. A distinctive feature of our BP-Uchuu light-cone maps is their capability to assess the inﬂuence of both extrinsic and intrinsic scatter caused by triaxial gaseous halos and internal gas characteristics, respectively, at the map level. We show that triaxial gas drives substantial scatter in X-ray luminosities of clusters and groups, accounting for nearly half of the total scatter in core-excised measurements. Additionally, scatter in the thermal pressure and gas density proﬁles of halos enhances the X-ray and SZ power spectra, leading to biases in cosmological parameter estimates. These ﬁndings are statistically robust due to the extensive sky coverage and large halo sample in the BP-Uchuu maps. The BP-Uchuu maps are publicly available online via Globus (https://app.globus.org/ﬁle-manager?origin_id=cf8dadb7-b6e9-4e2c-abc1-0813877efc13).

@article{lau_baryon_2025,
	title = {Baryon {Pasting} the {Uchuu} {Light}-cone {Simulation}},
	volume = {980},
	issn = {0004-637X, 1538-4357},
	url = {https://iopscience.iop.org/article/10.3847/1538-4357/ada940},
	doi = {10.3847/1538-4357/ada940},
	abstract = {We present the Baryon Pasted (BP) X-ray and thermal Sunyaev–Zel’dovich (tSZ) maps derived from the half-sky Uchuu light-cone simulation. These BP-Uchuu maps are constructed using more than 75 million dark matter halos with masses M500c 1013 Me within the redshift range 0 z 2. A distinctive feature of our BP-Uchuu light-cone maps is their capability to assess the inﬂuence of both extrinsic and intrinsic scatter caused by triaxial gaseous halos and internal gas characteristics, respectively, at the map level. We show that triaxial gas drives substantial scatter in X-ray luminosities of clusters and groups, accounting for nearly half of the total scatter in core-excised measurements. Additionally, scatter in the thermal pressure and gas density proﬁles of halos enhances the X-ray and SZ power spectra, leading to biases in cosmological parameter estimates. These ﬁndings are statistically robust due to the extensive sky coverage and large halo sample in the BP-Uchuu maps. The BP-Uchuu maps are publicly available online via Globus (https://app.globus.org/ﬁle-manager?origin\_id=cf8dadb7-b6e9-4e2c-abc1-0813877efc13).},
	language = {en},
	number = {1},
	urldate = {2026-05-05},
	journal = {The Astrophysical Journal},
	author = {Lau, Erwin T. and Nagai, Daisuke and Farahi, Arya and Ishiyama, Tomoaki and Miyatake, Hironao and Osato, Ken and Shirasaki, Masato},
	month = feb,
	year = {2025},
	keywords = {SYS: CosmicAI Contact Author, Use-Inspired, WG: Explainable},
	pages = {122},
}

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