论文标题
在插图-TNG模拟中，Z = 0处的宇宙丝周围气相的性质
Properties of gas phases around cosmic filaments at z=0 in the Illustris-TNG simulation
论文作者
论文摘要
我们介绍了在红移Z = 0处TNG300-1水力动力模拟中检测到的宇宙WEB丝周围的气相的研究。我们根据温度和密度分离五个不同阶段的气体。我们表明，在热热层间培养基（WHIM）中，细丝本质上是由天然气支配的，该培养基（WHIM）占BARYON预算的80％以上，以$ r \ sim 1 $ MPC。除了气味之外，细丝的核心（$ r <1 $ mpc）还举办了大量贡献，其他更热和更密集的气相阶段，其分数取决于细丝种群。通过构建温度和压力轮廓，我们发现细丝中的气体等于$ r \ sim 1.5 $ MPC，平均温度为t_core = $ 4-13 \ times 10^5 $ k，取决于大型环境。细丝芯的压力平均为p_core = $ 4-12 \ times 10^{ - 7} $ kev/cm^3，比观察到的簇中测得的压力低约1000倍。我们还估计，来自细丝核心的观察到的Sunyaev-Zel'Dovich（SZ）信号应在$ 0.5 <y <4.1 \ times 10^{ - 8} $之间，并将这些结果与最近的观察结果进行比较。我们的发现表明，细丝中气体的状态取决于光环的存在以及大规模的环境。
We present the study of gas phases around cosmic-web filaments detected in the TNG300-1 hydro-dynamical simulation at redshift z=0. We separate the gas in five different phases according to temperature and density. We show that filaments are essentially dominated by gas in the warm-hot intergalactic medium (WHIM), which accounts for more than 80% of the baryon budget at $r \sim 1$ Mpc. Apart from WHIM gas, cores of filaments ($r<1$ Mpc) also host large contributions other hotter and denser gas phases, whose fractions depend on the filament population. By building temperature and pressure profiles, we find that gas in filaments is isothermal up to $r \sim 1.5$ Mpc, with average temperatures of T_core = $4-13 \times 10^5$ K, depending on the large scale environment. Pressure at cores of filaments is on average P_core = $4-12 \times 10^{-7}$ keV/cm^3, which is ~1000 times lower than pressure measured in observed clusters. We also estimate that the observed Sunyaev-Zel'dovich (SZ) signal from cores of filaments should range between $0.5 < y < 4.1 \times 10^{-8}$, and these results are compared with recent observations. Our findings show that the state of the gas in filaments depend on the presence of haloes, and on the large scale environment.
