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arXiv 2201.02636astro-ph.GAastro-ph.CO
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高$z$星系的观测:SERRA模拟

A survey of high-$z$ galaxies: SERRA simulations

A. Pallottini, A. Ferrara, S. Gallerani, C. Behrens, M. Kohandel, S. Carniani, L. Vallini, S. Salvadori, V. Gelli, L. Sommovigo, V. D'Odorico, F. Di Mascia, E. Pizzati

摘要:

我们介绍了SERRA,一套放大高分辨率($\sim 10\,\rm pc$)宇宙学模拟,包括非平衡化学和飞行中的辐射传输。输出后处理,以获得星系UV+FIR连续谱和发射线的属性。将结果与可用的多波长数据进行比较以约束物理性质(例如,恒星形成率,恒星/气体/尘埃质量,金属丰度)的高红移$6 \lesssim z \lesssim 15$星系。这篇旗舰论文的重点是$z=7.7$子样本,包括202个具有恒星质量$10^7 M_\odot \lesssim M_\star \lesssim 5\times 10^{10}M_\odot$的星系,以及从年轻低质量星系的${\rm sSFR} \sim 100\,{\rm Gyr}^{-1}$到老年大质量星系的$\sim 10\,{\rm Gyr}^{-1}$的特定恒星形成。在这个红移,SERRA星系是典型的爆发,也就是说,它们位于施密特-肯尼库特关系的一个因素$κ_s = 3.03^{+4.9}_{-1.8}$,与最近的发现一致的[OIII]和[CII]发射体在高$z$。它们也表现出相对较大的${\rm IRX} = L_{\rm FIR}/L_{\rm UV}$值,这是由于它们的紧凑/clusional形态有效地阻挡了恒星的紫外光度。请注意,这一结论可能会受到分子云水平上空间分辨率不足的影响。我们确认早期星系的关系是标准的$\rm [CII]-SFR$;它们观测到的$L_{\rm [OIII]}/L_{\rm [CII]} \simeq 1-10$比可以被部分SERRA星系所再现,而不需要头重脚轻的IMF和/或异常的C/O丰度。[OI]谱线强度与局部谱线强度相似,这使得ALMA高$z$检测具有挑战性但可行(对于SFR为$50\,M_\odot\,{\rm yr}^{-1}$的$\sim 6\,\rm hr$)。

英文摘要:

We introduce SERRA, a suite of zoom-in high-resolution ($\sim 10\,\rm pc$) cosmological simulations including non-equilibrium chemistry and on-the-fly radiative transfer. The outputs are post-processed to derive galaxy UV+FIR continuum and emission line properties. Results are compared with available multi-wavelength data to constrain the physical properties (e.g., star formation rates, stellar/gas/dust mass, metallicity) of high-redshift $6 \lesssim z \lesssim 15$ galaxies. This flagship paper focuses on the $z=7.7$ sub-sample, including 202 galaxies with stellar mass $10^7 M_\odot \lesssim M_\star \lesssim 5\times 10^{10}M_\odot$, and specific star formation ranging from ${\rm sSFR} \sim 100\,{\rm Gyr}^{-1}$ in young, low-mass galaxies to $\sim 10\,{\rm Gyr}^{-1}$ for older, massive ones. At this redshift, SERRA galaxies are typically bursty, i.e. they are located above the Schmidt-Kennicutt relation by a factor $κ_s = 3.03^{+4.9}_{-1.8}$, consistent with recent findings for [OIII] and [CII] emitters at high-$z$. They also show relatively large ${\rm IRX} = L_{\rm FIR}/L_{\rm UV}$ values as a result of their compact/clumpy morphology effectively blocking the stellar UV luminosity. Note that this conclusion might be affected by insufficient spatial resolution at the molecular cloud level. We confirm that early galaxies lie on the standard $\rm [CII]-SFR$ relation; their observed $L_{\rm [OIII]}/L_{\rm [CII]} \simeq 1-10$ ratios can be reproduced by a part of the SERRA galaxies without the need of a top-heavy IMF and/or anomalous C/O abundances. [OI] line intensities are similar to local ones, making ALMA high-$z$ detections challenging but feasible ($\sim 6\,\rm hr$ for a SFR of $50\,M_\odot\,{\rm yr}^{-1}$).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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