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
中科院分区:
文献类型:
--
作者:
Poudel, Suraj;Kulkarni, Varsha P;Som, Debopam;Péroux, Céline
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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DOI:
--
发表时间:
1997
期刊:
影响因子:
--
作者:
B. Wood;J. Linsky
通讯作者:
J. Linsky
影响因子:
4.8
作者:
V. P. Kulkarni;P. Khare;C. Péroux;D. G. York;J. Lauroesch;J. Meiring
通讯作者:
J. Meiring
影响因子:
4.8
作者:
Suraj Poudel;V. Kulkarni;Frances H. Cashman;B. Frye;C. Péroux;H. Rahmani;S. Quiret
通讯作者:
Suraj Poudel;V. Kulkarni;Frances H. Cashman;B. Frye;C. Péroux;H. Rahmani;S. Quiret
影响因子:
6.5
作者:
Noterdaeme, P.;Ledoux, C.;Lopez, S.
通讯作者:
Lopez, S.
DOI:
10.1046/j.1365-8711.2003.06952.x
发表时间:
2003
影响因子:
4.8
作者:
C. Péroux;M. Dessauges;S. D’odorico;Tae Sun Kim;Richard G. McMahon Osservatorio di Trieste;I. E. G. Observatory;G. I. F. Astronomy;Cambridge;UK.
通讯作者:
UK.