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Silicon depletion in damped Ly alpha systems The S/Zn method

文献类型：期刊论文

作者Vladilo, G.1; Abate, C.2,3; Yin, J.2,4; Cescutti, G.2; Matteucci, F.2
刊名ASTRONOMY & ASTROPHYSICS
出版日期2011-06-01
卷号530期号:1页码:1
关键词ISM: abundances dust galaxies: high-redshift quasars: absorption lines methods: miscellaneous instrumentation: spectrographs extinction
英文摘要Silicates are an important component of interstellar dust that has been poorly investigated in high redshift galaxies. As a preliminary step to studying silicates at high redshift, we survey silicon depletions in damped Ly alpha (DLA) systems. Silicon depletion is mild in the Galactic interstellar medium (ISM) and is expected to be weaker in most DLA systems, so we introduce a method for improving the accuracy of DLA depletion measurements. We compare abundance ratios measured in the gas with calculations of total abundance ratios of gas and dust predicted by models of galactic chemical evolution tailored for DLA systems. To tune the model parameters, we use the dust-free observational diagram S/Zn versus Zn/H, and we also compare the look back time estimated from the absorption redshift with the evolutionary time predicted by the model. By applying our method to a large set of DLA column densities, we succeeded in measuring the depletion of silicon in 74 systems. For comparison, we also measure iron and magnesium depletions (105 and 10 systems, respectively) with the same method. The mean depletion of silicon that we derive, similar or equal to -0.27 +/- 0.16 dex, is surprisingly close to that of iron, similar or equal to -0.42 +/- 0.28 dex, despite iron being much more depleted than silicon in the Galactic ISM. Silicon depletion in DLA systems does not correlate with metallicity, at variance with iron depletion, for which we confirm a rise with [Fe/H] found in previous work. Magnesium depletion seems to behave more in accordance with silicon than with iron. The different behaviors of the silicon and iron depletions suggests a complex history of dust production at the early stages of galactic chemical evolution.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]HIGH-REDSHIFT GALAXIES ; MG-II SYSTEMS ; CHEMICAL EVOLUTION ; ELEMENTAL ABUNDANCES ; INTERSTELLAR-MEDIUM ; MILKY-WAY ; METALLICITY EVOLUTION ; INTERMEDIATE-REDSHIFT ; MOLECULAR-HYDROGEN ; COMPREHENSIVE SET
收录类别SCI
语种英语
WOS记录号WOS:000291027400033
源URL[http://119.78.226.72/handle/331011/28107]  
专题上海天文台_星系宇宙学重点实验室
作者单位1.Osserv Astron Trieste, Ist Nazl Astrofis, I-34131 Trieste, Italy
2.Univ Trieste, Dipartmento Fis, Sez Astron, I-34127 Trieste, Italy
3.Astron Inst Utrecht, Buys Ballot Lab, NL-3508 TA Utrecht, Netherlands
4.Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式
GB/T 7714		 Vladilo, G.,Abate, C.,Yin, J.,et al. Silicon depletion in damped Ly alpha systems The S/Zn method[J]. ASTRONOMY & ASTROPHYSICS,2011,530(1):1.
APA Vladilo, G.,Abate, C.,Yin, J.,Cescutti, G.,&Matteucci, F..(2011).Silicon depletion in damped Ly alpha systems The S/Zn method.ASTRONOMY & ASTROPHYSICS,530(1),1.
MLA Vladilo, G.,et al."Silicon depletion in damped Ly alpha systems The S/Zn method".ASTRONOMY & ASTROPHYSICS 530.1(2011):1.

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来源：上海天文台

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