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arXiv 1907.06962astro-ph.GA
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用MIRI/JWST光谱研究再电离时期星系的物理性质

Investigating the physical properties of galaxies in the Epoch of Reionization with MIRI/JWST spectroscopy

J. Álvarez-Márquez, L. Colina, R. Marques-Chaves, D. Ceverino, A. Alonso-Herrero, K. Caputi, M. García-Marín, A. Labiano, O. Le Fèvre, H. U. Norgaard-Nielsen, G… 展开作者

J. Álvarez-Márquez, L. Colina, R. Marques-Chaves, D. Ceverino, A. Alonso-Herrero, K. Caputi, M. García-Marín, A. Labiano, O. Le Fèvre, H. U. Norgaard-Nielsen, G. Östlin, P. G. Pérez-González, J. P. Pye, T. V. Tikkanen, P. P. van der Werf, F. Walter, G. S. Wright

摘要:

詹姆斯·韦伯太空望远镜将为红移超过6的源提供深度成像和光谱学,覆盖再电离时代(EoR,6 < z < 10)。中红外仪器(MIRI)积分场摄谱仪(MRS)将是JWST上唯一能够观察到最亮的光学发射线H $α$和[OIII]0.5007 $μ$ m的仪器,红移分别超过7和9。本文研究了用FIRSTLIGHT宇宙学模拟方法预测的红移为6.5 ~ 10.5星系的H $α$通量及其MIRI探测能力。深度(40 k s)光谱与MRS的整合将能够探测到(S/N > 5)红移大于7的EoR源,其内在恒星形成速率大于2 M $_{\odot}$ yr $^{-1}$,恒星质量大于4-9 $\times$ 10 $^7$ M $_{\odot}$。此外,本文提出了现实的MRS模拟观测的预期(休息帧)的光学和近红外光谱的一些光谱确认的EoR源探测ALMA作为[OIII]88 $μ$ m发射器。MRS模拟光谱覆盖从约0.2至0.02 Z $_{\odot}$的宽范围的低金属丰度和不同的[OIII]88 $μ$ m/[OIII]0.5007 $μ$ m线比。模拟的10 ksMRS谱显示,对于MACS 1149-JD 1的H $β$,[OIII] 0.4959,0.5007 $μ$ m,H $α$和He I 1.083 $μ$ m发射线,在z = 9.11处,S/N在5至90的范围内,与金属丰度无关。此外,在z=7.15处的发光合并候选物B14-65666的深40 ks模拟光谱显示了MRS检测[NII]0.6584 $μ$ m、[SII] 0.6717、0.6731 $μ$ m和[SIII] 0.9069、0.9532 $μ$ m发射线的能力,或对这些发射线设置强上限。总之,MRS将能够详细研究明亮(内在或透镜)EoR源中的关键物理特性,如内部消光,瞬时恒星形成,电离连续体的硬度和金属丰度。

英文摘要:

The James Webb Space Telescope will provide deep imaging and spectroscopy for sources at redshifts above 6, covering the Epoch of Reionization (EoR, 6 < z < 10). The Mid-IR instrument (MIRI) integral field spectrograph (MRS) will be the only instrument on board JWST able to observe the brightest optical emission lines H$α$ and [OIII]0.5007$μ$m at redshifts above 7 and 9, respectively. This paper presents a study of the H$α$ fluxes predicted by FIRSTLIGHT cosmological simulations for galaxies at redshifts of 6.5 to 10.5, and its detectability with MIRI. Deep (40 ks) spectroscopic integrations with MRS will be able to detect (S/N > 5) EoR sources at redshifts above 7 with intrinsic star formation rates of more than 2 M$_{\odot}$ yr$^{-1}$, and stellar masses above 4-9 $\times$ 10$^7$ M$_{\odot}$. In addition, the paper presents realistic MRS simulated observations of the expected (rest-frame) optical and near-infrared spectra for some spectroscopically confirmed EoR sources detected by ALMA as [OIII]88$μ$m emitters. The MRS simulated spectra cover a wide range of low metallicities from about 0.2 to 0.02Z$_{\odot}$, and different [OIII]88$μ$m/[OIII]0.5007$μ$m line ratios. The simulated 10ks MRS spectra show S/N in the range of 5 to 90 for H$β$, [OIII]0.4959,0.5007$μ$m, H$α$ and HeI1.083$μ$m emission lines of MACS1149-JD1 at z = 9.11, independent of metallicity. In addition, deep 40 ks simulated spectra of the luminous merger candidate B14-65666 at z=7.15 shows the MRS capabilities of detecting, or putting strong upper limits, on the [NII]0.6584$μ$m, [SII]0.6717,0.6731$μ$m, and [SIII]0.9069,0.9532$μ$m emission lines. In summary, MRS will enable the detailed study of key physical properties like internal extinction, instantaneous star formation, hardness of the ionising continuum, and metallicity, in bright (intrinsic or lensed) EoR sources.

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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