Inferring Cosmological Parameters on SDSS via Domain-generalized Neural Networks and Light-cone Simulations

Autor: Jun-Young Lee, Ji-hoon Kim, Minyong Jung, Boon Kiat Oh, Yongseok Jo, Songyoun Park, Jaehyun Lee, Yuan-Sen Ting, Ho Seong Hwang

Publikováno v: The Astrophysical Journal, Vol 975, Iss 1, p 38 (2024)

We present a proof-of-concept simulation-based inference on Ω _m and σ _8 from the Sloan Digital Sky Survey (SDSS) Baryon Oscillation Spectroscopic Survey (BOSS) LOWZ Northern Galactic Cap (NGC) catalog using neural networks and domain generalizati

Externí odkaz: https://doaj.org/article/6e650d458a0f46668591b6d495b21295

Merger-tree-based Galaxy Matching: A Comparative Study across Different Resolutions

Autor: Minyong Jung, Ji-hoon Kim, Boon Kiat Oh, Sungwook E. Hong, Jaehyun Lee, Juhan Kim

Publikováno v: The Astrophysical Journal, Vol 965, Iss 2, p 156 (2024)

We introduce a novel halo/galaxy matching technique between two cosmological simulations with different resolutions, which utilizes the positions and masses of halos along their subhalo merger tree. With this tool, we conduct a study of resolution bi

Externí odkaz: https://doaj.org/article/fb059b0c1c6d46b2b2204d6b769f1018

The AGORA High-resolution Galaxy Simulations Comparison Project. VI. Similarities and Differences in the Circumgalactic Medium

Autor: Clayton Strawn, Santi Roca-Fàbrega, Joel R. Primack, Ji-hoon Kim, Anna Genina, Loic Hausammann, Hyeonyong Kim, Alessandro Lupi, Kentaro Nagamine, Johnny W. Powell, Yves Revaz, Ikkoh Shimizu, Héctor Velázquez, Tom Abel, Daniel Ceverino, Bili Dong, Minyong Jung, Thomas R. Quinn, Eun-jin Shin, Kirk S. S. Barrow, Avishai Dekel, Boon Kiat Oh, Nir Mandelker, Romain Teyssier, Cameron Hummels, Soumily Maji, Antonio Man, Paul Mayerhofer, the AGORA Collaboration

Publikováno v: The Astrophysical Journal, Vol 962, Iss 1, p 29 (2024)

We analyze the circumgalactic medium (CGM) for eight commonly-used cosmological codes in the AGORA collaboration. The codes are calibrated to use identical initial conditions, cosmology, heating and cooling, and star formation thresholds, but each ev

Externí odkaz: https://doaj.org/article/474a5d4aba8e44bbb3466e8571991fcd

The fate of baryons in counterfactual universes

Autor: Boon Kiat Oh, John A Peacock, Sadegh Khochfar, Britton D Smith

Publikováno v: Oh, B K, Peacock, J A, Khochfar, S & Smith, B D 2022, ' The fate of baryons in counterfactual universes ', Monthly Notices of the Royal Astronomical Society, vol. 517, no. 1, pp. 59-75 . https://doi.org/10.1093/mnras/stac2669

We present results from nine simulations that compare the standard $\Lambda$ Cold Dark Matter cosmology ($\Lambda$CDM) with counterfactual universes, for approximately $100\,{\rm Gyr}$ using the Enzo simulation code. We vary the value of $\Lambda$ an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb7688afdbda499ff93dddeae638f996
https://doi.org/10.1093/mnras/stac2669

Calibration of a star formation and feedback model for cosmological simulations with enzo

Autor: Boon Kiat Oh, John A. Peacock, Britton D. Smith, Sadegh Khochfar

Publikováno v: Monthly Notices of the Royal Astronomical Society
Oh, B K, Smith, B D, Peacock, J A & Khochfar, S 2020, ' Calibration of a star formation and feedback model for cosmological simulations with Enzo ', Monthly Notices of the Royal Astronomical Society, vol. 497, no. 4, pp. 5203-5219 . https://doi.org/10.1093/mnras/staa2318

We introduce a new methodology for efficiently tuning sub-grid models of star formation and supernovae feedback in cosmological simulations and at the same time understanding their physical implications. Based on a set of 71 zoom simulations of a Mil

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::456caae341f20103d960848d6acc6ca6
https://doi.org/10.1093/mnras/staa2318