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arXiv 0705.1636astro-ph
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VLTI上的AMBER:数据处理和校准问题

AMBER on the VLTI: data processing and calibration issues

Florentin Millour, Romain Petrov, Fabien Malbet, Eric Tatulli, Gilles Duvert, Gérard Zins, Evelyne Altariba, Martin Vannier, Oscar Hernandez, Gianluca Li Causi

摘要:

我们在这里提出的AMBER / VLTI仪器的标准使用的当前性能,并比较这些与仪器提供的模式。我们表明,该仪器是能够达到其指定的精度只有中,高光谱分辨率模式,差分可观测量和明亮的对象。对于绝对可观测量,目前可达到的精度受到单位望远镜振动的强烈限制,并且还受到没有考虑夜间传递函数监测的观测程序的限制。对于低分辨率模式,电流限制更多地在数据减少侧,因为在当前流水线中没有考虑在中等光谱分辨率下可以忽略的几个影响。最后,对于微弱的物体(SNR约为1,每个光谱通道),电磁干扰VLTI干涉实验室与检测器电子阻止目前获得无偏测量。正在研究在数据处理方面纠正这种影响的想法,但应认真研究硬件修复,因为它严重限制了仪器的有效限制幅度。

英文摘要:

We present here the current performances of the AMBER / VLTI instrument for standard use and compare these with the offered modes of the instrument. We show that the instrument is able to reach its specified precision only for medium and high spectral resolution modes, differential observables and bright objects. For absolute observables, the current achievable accuracy is strongly limited by the vibrations of the Unit Telescopes, and also by the observing procedure which does not take into account the night-long transfer function monitoring. For low-resolution mode, the current limitation is more in the data reduction side, since several effects negligible at medium spectral resolution are not taken into account in the current pipeline. Finally, for faint objects (SNR around 1 per spectral channel), electromagnetic interferences in the VLTI interferometric laboratory with the detector electronics prevents currently to get unbiased measurements. Ideas are under study to correct in the data processing side this effect, but a hardware fix should be investigated seriously since it limits seriously the effective limiting magnitude of the instrument.

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