Metals and a search for molecules in the distant Universe: Magellan mike observations of sub-DLAs at 2 < z < 3

Metals and a search for molecules in the distant Universe: Magellan mike observations of sub-DLAs at 2 < z < 3
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金属和寻找遥远宇宙中的分子:麦哲伦麦克在 2 < z < 3 处对亚 DLA 的观测

DOI:
10.1093/mnras/stab926
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发表时间:
2021
影响因子:
4.8
通讯作者:
Péroux, Céline
Péroux, Céline
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Poudel, Suraj;Kulkarni, Varsha P;Som, Debopam;Péroux, Céline

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我们利用麦哲伦望远镜上的MIKE光谱仪的观测结果,在z= 2.173到2.635的红移范围内,对四个亚dla的Zn、S、O、C、Si和Fe元素进行了丰度测量,以限制富气体星系的化学富集和恒星形成。利用弱贫元素O、S和Zn,我们发现吸收剂atz= 2.173、2.236、2.539和2.635,经光离校正后的金属丰度分别为[S/H] = - 0.50±0.11、[O/H] > - 0.84、[O/H] = - 1.27±0.12和[Zn/H] = +0.40±0.12。此外,我们能够使用Cii -大圆和Siii -大圆的精细结构线对两个子dla的电子密度施加约束。我们发现这些值远高于文献中dla的中位数。此外,我们估计了吸收体atz= 2.173的冷却速率c= 1.20 × 10−26erg s−1 / H原子,这表明在这种亚dla中的恒星形成速率密度高于类似红移的dla的典型恒星形成速率密度。我们还研究了金属丰度与速度色散的关系。大多数吸收剂都遵循从文献中对亚dla的质量与金属丰度关系中可以预期的趋势。最后,我们能够从各种CO分子强谱线的未检测中对分子柱密度进行限制。根据1544、1510和1478 Å附近CO AX 0 - 0、1-0和2-0波段未检测到J= 0能级的吸收,分别估计出logN(CO,J= 0) < 13.87、logN(CO,J= 0) < 13.17和logN(CO,J= 0) < 13.08的3σ上限。
We present abundance measurements of the elements Zn, S, O, C, Si, and Fe for four sub-DLAs at redshifts ranging fromz= 2.173 to 2.635 using observations from the MIKE spectrograph on the Magellan telescope to constrain the chemical enrichment and star formation of gas-rich galaxies. Using weakly depleted elements O, S, and or Zn, we find the metallicities after the photoionization corrections to be [S/H] = −0.50 ± 0.11, [O/H] > −0.84, [O/H] = −1.27 ± 0.12, and [Zn/H]  = +0.40 ± 0.12 for the absorbers atz= 2.173, 2.236, 2.539, and 2.635, respectively. Moreover, we are able to put constraints on the electron densities using the fine structure lines of Cii⋆and Siii⋆for two of the sub-DLAs. We find that these values are much higher than the median values found in DLAs in the literature. Furthermore, we estimate the cooling ratelc= 1.20 × 10−26erg s−1per H atom for an absorber atz= 2.173, suggesting higher star formation rate density in this sub-DLA than the typical star formation rate density for DLAs at similar redshifts. We also study the metallicity versus velocity dispersion relation for our absorbers. Most of the absorbers follow the trend one can expect from the mass versus metallicity relation for sub-DLAs in the literature. Finally, we are able to put limits on the molecular column density from the non-detections of various strong lines of CO molecules. We estimate 3σupper limits of logN(CO,J= 0) < 13.87, logN(CO,J= 0) < 13.17, and logN(CO,J= 0) < 13.08, respectively, from the non-detections of absorption from theJ= 0 level in the CO AX 0–0, 1–0, and 2–0 bands near 1544, 1510, and 1478 Å.
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发表时间: 2006
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