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arXiv · 2607.06933

Constructing a Mock Galaxy Catalog for the All-sky SPECtroscopic Survey of Nearby Galaxies (A-SPEC) Using the Machine-assisted Semi-Simulation Model

Dongkok Kim·Yongseok Jo·Ho Seong Hwang·Ji-hoon Kim·Juhan Kim·Jaehyun Lee·Hyeonguk Bahk·Young-Man Choi·Moo-Young Chun·Sang-Hyun Chun·Haeun Chung·Kim Dachan·Sungwook E. Hong·Minhee Hyun·Donghui Jeong·Jae-Woo Kim·Kang-Min Kim·Yunjong Kim·Jongwan Ko·Minseong Kwon·Ho-Gyu Lee·Jong Chul Lee·Yongseok Lee·Hyunho Lim·Heeyoung Oh·Changbom Park·Hyunmi Song·Mingyeong Yang·Yongmin Yoon
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Abstract

We present a methodology for constructing a mock galaxy catalog for the All-sky SPECtroscopic survey of nearby galaxies (A-SPEC) using the Machine-assisted Semi-Simulation Model. The model is trained on the cosmological magnetohydrodynamical simulation IllustrisTNG to predict baryonic properties of subhalos from dark-matter-only features and is applied to our own N-body simulation tailored to satisfy the requirements of A-SPEC. We have improved the model's accuracy by introducing additional features such as subhalo anisotropy parameters and modified definitions of the subhalo environment, which result in the coefficient of determination R^2=0.96, 0.90, 0.70, 0.79 for stellar mass, gas mass, star formation rate, and gas metallicity, respectively. The resulting mock galaxies reproduce the luminosity-dependent clustering of the target galaxies when tuned to match the number density. We discuss avenues for further improvement, including the role of environment in the predictions. We release the mock galaxy catalog with the baryonic properties predicted from the model.

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Dongkok Kim, Yongseok Jo, Ho Seong Hwang, Ji-hoon Kim, Juhan Kim, Jaehyun Lee, Hyeonguk Bahk, Young-Man Choi, Moo-Young Chun, Sang-Hyun Chun, Haeun Chung, Kim Dachan, Sungwook E. Hong, Minhee Hyun, Donghui Jeong, Jae-Woo Kim, Kang-Min Kim, Yunjong Kim, Jongwan Ko, Minseong Kwon, Ho-Gyu Lee, Jong Chul Lee, Yongseok Lee, Hyunho Lim, Heeyoung Oh, Changbom Park, Hyunmi Song, Mingyeong Yang, Yongmin Yoon. 2026-07-08. Constructing a Mock Galaxy Catalog for the All-sky SPECtroscopic Survey of Nearby Galaxies (A-SPEC) Using the Machine-assisted Semi-Simulation Model. https://arxiv.org/abs/2607.06933

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