تقرير
Merger Tree-based Galaxy Matching: A Comparative Study Across Different Resolutions
| العنوان: | Merger Tree-based Galaxy Matching: A Comparative Study Across Different Resolutions |
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| المؤلفون: | Jung, Minyong, Kim, Ji-hoon, Oh, Boon Kiat, Hong, Sungwook E., Lee, Jaehyun, Kim, Juhan |
| المصدر: | ApJ 965 156 (2024) |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | 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 biases through the {\it galaxy-by-galaxy} inspection of a pair of simulations that have the same simulation configuration but different mass resolutions, utilizing a suite of {\sc IllustrisTNG} simulations to assess the impact on galaxy properties. We find that, with the subgrid physics model calibrated for TNG100-1, subhalos in TNG100-1 (high resolution) have $\lesssim0.5$ dex higher stellar masses than their counterparts in the TNG100-2 (low-resolution). It is also discovered that the subhalos with $M_{\mathrm{gas}}\sim10^{8.5}\,{\rm M}_\odot$ in TNG100-1 have $\sim0.5$ dex higher gas mass than those in TNG100-2. The mass profiles of the subhalos reveal that the dark matter masses of subhalos in TNG100-2 converge well with those from TNG100-1, except within 4 kpc of the resolution limit. The differences in stellar mass and hot gas mass are most pronounced in the central region. We exploit machine learning to build a correction mapping for the physical quantities of subhalos from low- to high-resolution simulations (TNG300-1 and TNG100-1), which enables us to find an efficient way to compile a high-resolution galaxy catalog even from a low-resolution simulation. Our tools can easily be applied to other large cosmological simulations, testing and mitigating the resolution biases of their numerical codes and subgrid physics models. Comment: 24 pages, 14 figures; Accepted for publication in to ApJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.3847/1538-4357/ad34d1 |
| الوصول الحر: | http://arxiv.org/abs/2312.02466Test |
| رقم الانضمام: | edsarx.2312.02466 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.3847/1538-4357/ad34d1 |
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