Characterizing U-Ne hollow cathode lamps at near-IR wavelengths for the CARMENES survey

Characterizing U-Ne hollow cathode lamps at near-IR wavelengths for the CARMENES survey
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在 CARMENES 调查中表征 U-Ne 空心阴极灯的近红外波长

DOI:
10.1117/12.2056501
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Hideki
Hideki
中科院分区:
--
文献类型:
--
作者:
Ramsay;Suzanne K;McLean;Takami;Hideki

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U和Th空心阴极灯是天文光谱仪中标准的频率校准器。为了优化CARMENES调查近红外波长径向速度测量的精度,我们使用高分辨率傅里叶变换光谱仪和InGaAs探测器对12个商用U-Ne空心阴极灯进行了表征,以分析950至1700 nm之间的波长范围。我们记录了在8、10和12 mA下工作的UNe的光谱图谱,这是天文台使用的典型值,以最大限度地延长灯的寿命。除了光谱图谱,我们还分析了预热时间、不同元素谱线的平均强度、发射谱线的位置和宽度以及混合谱线等特性。我们的灯在光谱中没有显示出强烈的特性或明显的污染。铀矿线的识别基于线宽,与Redman等人(2011)的目录一致。我们的线列表可以添加大量的线,特别是在9000 cm-1(1.1 μm)范围内,由于探测器灵敏度有限,目录不完整。我们可以通过测量线宽来识别发出附加线的元素。在与径向速度测量相关的波长处增加U线的数量可以显著提高径向速度测量的精度。
Hollow cathode lamps of U and Th are the standard frequency calibrators in astronomical spectrographs. In an effort to optimize precision radial velocity measurements at near-IR wavelengths for the CARMENES survey, we are characterizing 12 commercial U-Ne hollow cathode lamps using a high resolution Fourier Transform Spectrograph and an InGaAs detector to analyze the wavelength range between 950 and 1700 nm. We have recorded spectral atlases of UNe operated at 8, 10 and 12 mA, which are typical values used at astronomical observatories in order to maximize lamp lifetimes. In addition to the spectral atlas, we analyze properties like warm-up times, average intensities from lines of different elements, positions and the width of emission lines, and blends. None of our lamps show strong peculiarities in the spectra or significant contamination. The identification of the uranium lines is based on the line widths and consistent with the Redman et al. (2011) catalog. Our line list can add a significant number of lines particularly in the range around 9000 cm-1(1.1 μm) where the catalog is incomplete because of limited detector sensitivity. We are able to identify the elements emitting additional lines by measuring the line width. The increased number of U lines at wavelengths relevant to radial velocity surveys can yield a significant improvement in the accuracy of radial velocity measurements.
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