在阻尼Lyα体系中寻找硼
A Search for Boron in Damped Lyα Systems
摘要：
我们提出了第一个系统的研究硼超出本地集团。分析了30个具有强金属线的阻尼Lyα系统（DLAs）的样品，这些DLAs被认为可以追踪高z星系的星际介质。我们报告两个硼检测> 3σ的意义;一个新的检测和一个确认。的B/O的比率，并首次，B/S与以前的恒星和星际测量在银河系和小麦哲伦云进行比较。与追踪氧丰度的硫进行比较的新方法，消除了与恒星氧测量相关的不确定性。对于这两个检测，推断的B/S比是在超过的预测，主要硼生产从spectrometry过程。讨论了可能的污染源，以及可能影响观察到的比率的物理效应。然而，从表面上看，这些测量的含义表明，在DLAs中可能有更高的宇宙射线通量。展望未来的硼探测在其他高红移的DLAs，以确认我们的结果进行了讨论。
英文摘要：
We present the first systematic study of boron beyond the Local Group. This analysis is performed on a sample of 30 damped Lyα systems (DLAs) with strong metal-lines, which are expected to trace the interstellar medium of high z galaxies. We report on two boron detections at > 3σ significance; one new detection and one confirmation. The ratios of B/O and, for the first time, B/S are compared with previous stellar and interstellar measurements in the Milky Way and Small Magellanic Cloud. The novel comparison with sulphur, which tracks oxygen's abundance, alleviates the uncertainty associated with stellar oxygen measurements. For both detections, the inferred B/S ratio is in excess of the prediction of primary boron production from spallation processes. Possible sources of contamination are discussed, as well as physical effects that could impact the observed ratios. However taken at face value, the implication of these measurements suggest potentially higher cosmic ray fluxes in DLAs. The prospects for future boron detections in other high redshift DLAs to confirm our results is also discussed.
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