论文标题

散文:GEMINI的Graces高分辨率光谱仪的管道

DRAGraces: A pipeline for the GRACES high-resolution spectrograph at Gemini

论文作者

Chené, André-Nicolas, Mao, Shunyuan, Lundquist, Michael, Martioli, Eder, Carlin, Jeffrey L.

论文摘要

本文介绍了软件ral(降低数据的数据减少和分析),这是从Gemini North Telescope上从Graces(Gemini Remote访问CFHT Esprograph)的管道减少光谱的。该代码用IDL语言编写。它旨在在给定目录中查找所有亮度框架,自动确定偏见,扁平,弧和科学框架的列表,并在几分钟内执行整个减少和提取。我们比较了从raper的输出与Opera的输出,这是CFHT在CFHT开发的管道,也可以提取Graces Spectra。这两个管道都是完全独立开发的,但它们提供了非常相似的提取光谱。他们都有自己的优势和缺点。例如,劳动更加简单,更易于使用,并且不太可能被需要调整的参数脱轨,而歌剧提供了更仔细的提取,当需要最高分辨率时,当需要最高的分辨率以及信噪比的比率较低时。在决定将哪一个用于科学之前,应该比较两者。然而,这两个管道都具有相当可比的分辨率(r〜52.8k和36.6k,rawraces r〜58k和40k and 40k对于高分辨率和低分辨率光谱模式),波长解决方案和信噪比求解和信噪比的比率按分辨率元素。

This paper describes the software DRAGraces (Data Reduction and Analysis for GRACES), which is a pipeline reducing spectra from GRACES (Gemini Remote Access to the CFHT ESPaDOnS Spectrograph) at the Gemini North Telescope. The code is written in the IDL language. It is designed to find all the GRACES frames in a given directory, automatically determine the list of bias, flat, arc and science frames, and perform the whole reduction and extraction within a few minutes. We compare the output from DRAGraces with that of OPERA, a pipeline developed at CFHT that also can extract GRACES spectra. Both pipelines were developed completely independently, yet they give very similar extracted spectra. They both have their advantages and disadvantages. For instance, DRAGraces is more straightforward and easy to use and is less likely to be derailed by a parameter that needs to be tweaked, while OPERA offers a more careful extraction that can be significantly superior when the highest resolution is required and when the signal-to-noise ratio is low. One should compare both before deciding which one to use for their science. Yet, both pipelines deliver a fairly comparable resolution power (R~52.8k and 36.6k for DRAGraces and R~58k and 40k for OPERA in high and low-resolution spectral modes, respectively), wavelength solution and signal-to-noise ratio per resolution element.

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