Data behind Pickles on FIRE: The 3D Shape Evolution of Simulated Milky Way–Mass Galaxies

Pickles on FIRE: The 3D Shape Evolution of Simulated Milky Way–Mass Galaxies This repository contains the data underlying all figures in Xia et al. (2026), submitted to MNRAS. The primary dataset (pickles_on_fire_data.csv) contains 3D shape measurements for 13 FIRE-2 zoom-in simulations of Milky Way-mass galaxies, measured at 17–18 snapshots each spanning z=7 to z=0. Shape measurements are provided for five tracers: mass-weighted all stars, young stars (<500 Myr), luminosity-weighted stars (g-band), cold gas (<10^4 K), dark matter (within r_vir), and Each row includes axis ratios (B/A, C/A), shape eigenvectors, velocity dispersion eigenvalues, rotational support parameters, and stellar masses. Additional files contain mock photometric data used in the 2D shape analysis: Sersic q-values from 30 random projections of each galaxy at z=0, 2, and 4 (Fig8_SersicRandomGband.csv), and idealized shape distributions for the three canonical shape classes (Fig7_IdealizedShapesData.csv). Simulations were performed as part of the FIRE project (http://fire.northwestern.edu) using FIRE-2 physics. The 13 galaxies comprise the Latte suite and the ELVIS on FIRE pairs.《Pickles on FIRE》：模拟银河系质量星系的三维形态演化 本数据集仓库包含已投稿至《皇家天文学会月报》(Monthly Notices of the Royal Astronomical Society, MNRAS)的Xia等人（2026）研究中所有配图的原始数据。 核心数据集（pickles_on_fire_data.csv）包含13个采用FIRE-2放大模拟的银河系质量星系的三维形态测量数据，每个星系对应17至18个红移覆盖z=7至z=0的观测快照。形态测量涵盖五类示踪体：质量加权全恒星、年轻恒星（年龄小于500 Myr）、光度加权恒星（g波段）、冷气体（温度低于10^4 K）以及暗物质（位于维里半径（r_vir）范围内）。每条数据行包含轴比（B/A、C/A）、形态本征向量、速度弥散本征值、旋转支撑参数以及恒星质量。 附加文件包含用于二维形态分析的模拟测光数据：分别在红移z=0、2、4时对每个星系进行30次随机投影得到的塞西克（Sersic）q值，存储于Fig8_SersicRandomGband.csv；以及三类标准形态类别的理想化形态分布数据，存储于Fig7_IdealizedShapesData.csv。 本模拟作为FIRE项目（http://fire.northwestern.edu）的一部分，采用FIRE-2物理模型完成。这13个星系包含Latte组以及ELVIS on FIRE双星系样本。