The distribution and physical properties of high-redshift [Oiii] emitters in a cosmological hydrodynamics simulation
The distribution and physical properties of high-redshift [Oiii] emitters in a cosmological hydrodynamics simulation
复制标题
宇宙流体动力学模拟中高红移 [Oiii] 发射体的分布和物理性质
DOI：
10.1017/s1743921319002424
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Moriwaki Kana
中科院分区：
文献类型：
--
作者：
Moriwaki Kana;Yoshida Naoki;Eide Marius B;Ciardi Benedetta;Moriwaki Kana
最近用阿塔卡马大毫米/亚毫米阵列观测到了远红外发射线，如来自∼7−9星系的[OIII]线。我们使用星系形成的宇宙学模拟来研究[OIII]发射体的物理性质。在一个50h−1Mpc的边上移动的体积中，我们定位了34个恒星质量大于z=9的星系，以及270多个z=7的此类星系。我们通过将高区的物理模型与利用光致电离共解密的发射线计算相结合的方法计算了[OIII]光度($L_{{\rm O\，{{\rm{\小{iii}}，88}$)。结果表明，对于给定的恒星形成率，得到的恒星形成率为L{{\rMO\，{{\rM{\小{III}，88}$，略高于根据经验公式预测的本星系红移为7-9的恒星形成率，与最近对红移为7-9的星系的观测结果一致。具有$L{{\rMO\，{{\rM{\小{III}}，88}\gT 10^8\，\rm L{\ODOT}$的恒星形成率高于，其典型的金属丰度为。这些星系由暗物质晕托管，其质量大于。我们建议使用詹姆斯·韦伯太空望远镜将探测到的[Oiii]5007线来研究星系的性质，这些星系的[Oiii]线发射已经被ALMA探测到了。
Recent observations with the Atacama Large Millimeter/submillimeter Array (ALMA) detected far-infrared emission lines such as the [Oiii]line from galaxies atz∼ 7−9. We use a cosmological simulation of galaxy formation to study the physical properties of [Oiii]emitters. In a comoving volume of 50h−1Mpc on a side, we locate 34 galaxies with stellar masses greater thanatz= 9, and more than 270 such galaxies atz= 7. We calculate the [Oiii]luminosities ($L_{{\rm O\,{{\rm {\small{III}}}, 88}}}$) by combining a physical model of Hiiregions with emission line calculations using the photoionization codecloudy. We show that the resulting $L_{{\rm O\,{{\rm {\small{III}}}, 88}}}$, for a given star formation rate, is slightly higher than predicted from the empirical relation for local galaxies, and is consistent with recent observations of galaxies at redshifts 7–9. Bright [Oiii] emitters with $L_{{\rm O\,{{\rm {\small{III}}}, 88}}}\gt 10^8\, \rm L_{\odot }$ have star formation rates higher than, and the typical metallicity is. The galaxies are hosted by dark matter haloes with masses greater than. We propose to use the [Oiii] 5007 Å line, to be detected byJames Webb Space Telescope, to study the properties of galaxies whose [Oiii]line emission has been already detected with ALMA.