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首页> 外文会议>International Astronomical Union >Probing isotopic ratios at redshift z = 0.89: molecular line absorption toward PKS 1830-211
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Probing isotopic ratios at redshift z = 0.89: molecular line absorption toward PKS 1830-211

机译：红移Z = 0.89的同位素率探讨：对PKS 1830-211的分子线吸收

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Molecular absorption lines in the line of sight to distant quasars are an extremely powerful tool to probe the dense interstellar medium and its chemical composition in intervening galaxies from low to high redshifts. The absorption line measurements of different isotopomers even allow us to study isotopic ratios, which can be interpreted as the signature of past nucleosynthesis activity, and put some constraints on the chemical evolution modelsIn this paper, we present the study of molecular absorption lines in front of the quasar PKS 1830-211. The absorption is due to an intervening galaxy at z = 0.89 which is identified as a nearly face-on spiral galaxy We have carried out a survey of absorption lines of various HCO+, HCN, HNC, and CS isotopomers with the Plateau de Bure Interferometer and derived for the first time the C, N, O, and S isotopic ratios in such a distant objectThis z = 0,89 absorption system offers an unique opportunity to study the chemical composition in the disk of a spiral galaxy only a few Gyr old. Our results show significantly different isotopic ratios as compared to those measured in the Solar System or in the local ISM, indicating a poorly enhanced abundance of material processed by intermediate and low mass stars.
机译：距离远处Quasars的视线中的分子吸收线是一种极其强大的工具，可以在从低到高射频中介入间隙的致密间隙培养基及其化学组成。不同同位素的吸收线测量甚至允许我们研究同位素比，这可以被解释为过去核酸异化活性的签名，并对化学进化模型进行一些限制，我们介绍了前面的分子吸收线的研究Quasar PKS 1830-211。吸收是由于Z = 0.89的介入星系，其被鉴定为几乎面对螺旋星系，我们已经进行了各种HCO +，HCN，HNC和CS同位素的勘测，具有高原DE Bure干涉仪和在这种遥控器Z = 0,89吸收系统中首次衍生C，N，O和S同位素比率，提供了在螺旋星系的盘中研究化学成分的独特机会，只有几个Gyr岁。与太阳系或局部ISM测量的结果相比，我们的结果显示出显着不同的同位素比例，表明由中间和低质量恒星加工的巨大材料丰富。

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