The AGORA High-resolution Galaxy Simulations Comparison Project. V: Satellite Galaxy Populations In A Cosmological Zoom-in Simulation of A Milky Way-mass Halo
The Astrophysical Journal(2024)
摘要
We analyze and compare the satellite halo populations at z∼2 in the
high-resolution cosmological zoom-in simulations of a 10^12
M_⊙ target halo (z=0 mass) carried out on eight widely-used
astrophysical simulation codes (Art-I, Enzo, Ramses, Changa, Gadget-3, Gear, Arepo-t, and Gizmo) for the
AGORA High-resolution Galaxy Simulations Comparison Project. We use
slightly different redshift epochs near z=2 for each code (hereafter
“z∼2') at which the eight simulations are in the same stage in the target
halo's merger history. After identifying the matched pairs of halos between the
CosmoRun simulations and the DMO simulations, we discover that each CosmoRun halo tends to be less massive than its DMO counterpart. When we
consider only the halos containing stellar particles at z∼2, the number of
satellite galaxies is significantly fewer than that of dark matter halos
in all participating AGORA simulations, and is comparable to the number
of present-day satellites near the Milky Way or M31. The so-called “missing
satellite problem' is fully resolved across all participating codes simply by
implementing the common baryonic physics adopted in AGORA and the stellar
feedback prescription commonly used in each code, with sufficient numerical
resolution (≲100 proper pc at z=2). We also compare other properties
such as the stellar mass-halo mass relation and the mass-metallicity
relation. Our work highlights the value of comparison studies such as AGORA, where outstanding problems in galaxy formation theory are studied
simultaneously on multiple numerical platforms.
更多查看译文
关键词
Galaxy formation,Astronomical simulations,Hydrodynamical simulations,Dwarf galaxies
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要