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The ESO Diffuse Interstellar Bands Large Exploration Survey: EDIBLES I. Project description survey sample and quality assessment

机译：ESO漫射星际带大型勘探调查：EDIBLES I.项目描述调查样本和质量评估

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摘要

The carriers of the diffuse interstellar bands (DIBs) are largely unidentified molecules ubiquitously present in the interstellar medium (ISM). After decades of study, two strong and possibly three weak near-infrared DIBs have recently been attributed to the C60+ fullerene based on observational and laboratory measurements. There is great promise for the identification of the over 400 other known DIBs, as this result could provide chemical hints towards other possible carriers.In an effort to systematically study the properties of the DIB carriers, we have initiated a new large-scale observational survey: the ESO Diffuse Interstellar Bands Large Exploration Survey (EDIBLES). The main objective is to build on and extend existing DIB surveys to make a major step forward in characterising the physical and chemical conditions for a statistically significant sample of interstellar lines-of-sight, with the goal to reverse-engineer key molecular properties of the DIB carriers.EDIBLES is a filler Large Programme using the Ultraviolet and Visual Echelle Spectrograph at the Very Large Telescope at Paranal, Chile. It is designed to provide an observationally unbiased view of the presence and behaviour of the DIBs towards early-spectral type stars whose lines-of-sight probe the diffuse-to-translucent ISM. Such a complete dataset will provide a deep census of the atomic and molecular content, physical conditions, chemical abundances and elemental depletion levels for each sightline. Achieving these goals requires a homogeneous set of high-quality data in terms of resolution (R ~ 70 000 – 100 000), sensitivity (S/N up to 1000 per resolution element), and spectral coverage (305–1042 nm), as well as a large sample size (100+ sightlines). In this first paper the goals, objectives and methodology of the EDIBLES programme are described and an initial assessment of the data is provided.
机译：星际漫射带（DIB）的载体主要是星际介质（ISM）中普遍存在的未识别分子。经过数十年的研究，最近将两个强且可能三个弱的近红外DIB归因于 C 60 + 富勒烯，基于观察和实验室测量。鉴定400多种其他DIB的潜力很大，因为该结果可能为其他可能的载体提供化学暗示。为了系统地研究DIB载体的性质，我们发起了一项新的大规模观察性调查：ESO漫射星际带大型勘探调查（EDIBLES）。主要目标是建立和扩展现有的DIB调查，从而在表征具有统计学意义的星际视线样本的物理和化学条件方面迈出了重要的一步，目的是对工程学的关键分子特性进行逆向工程DIB载具。EDIBLES是在智利Paranal的甚大望远镜上使用紫外线和可见埃希勒光谱仪进行的大型程序填充程序。它旨在提供DIB对早期光谱型恒星的存在和行为的观察无偏见，其视线探测从漫反射到半透明的ISM。这样一个完整的数据集将提供每个视线的原子和分子含量，物理条件，化学丰度和元素耗竭水平的深度普查。要实现这些目标，就需要一组均一的高质量数据，包括分辨率（R〜70 000 – 100 000），灵敏度（每个分辨率元素的信噪比（S / N）最高为1000）和光谱范围（305–1042 nm），以及大样本量（100多个视线）。在第一篇论文中，描述了EDIBLES计划的目标，目的和方法，并对数据进行了初步评估。

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