SixPak: a wide-field IFU for the William Herschel Telescope
SixPak: a wide-field IFU for the William Herschel Telescope
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SixPak：威廉·赫歇尔望远镜的宽视场 IFU
DOI：
10.1117/12.789130
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发表时间：
2008
影响因子：
6.5
通讯作者：
M. Spaans
中科院分区：
文献类型：
--
作者：
L. Venema;T. Schoenmaker;M. Verheijen;S. Trager;R. Rutten;M. Bershady;S. Larsen;R. Peletier;M. Spaans
我们打算为拉帕尔马上4.2米长的威廉·赫歇尔望远镜建造SixPak，这是一个基于光纤的宽视场IFU。光纤束将由238根光纤组成，每根直径3.0角秒，将光从WHT的Nasmyth焦平面输送到现有的WYFFOS工作台光谱仪。共有217根光纤将被密集堆积，以跨越×55角秒的六角形视场。剩下的21根光纤将从天空背景中收集光线。SixPak针对低表面亮度的扩展对象的中等分辨率的二维光谱进行了优化。在Nasmyth Focus，减焦器将望远镜的f比(f/11)与光纤的最佳f比(f/3)相匹配，以减少由于光纤焦比下降而造成的损失。微透镜将光纤的输出f比转换为WYFFOS准直器的f比(f/8.2)。通过在微透镜的瞳孔处设置可交换的狭缝，可以获得R=10,000的光谱分辨率。其目的是将SixPak开放给公众使用，以便更容易地接触到尽可能广泛的天文学社区。
We intend to construct SixPak, a wide-field fibre-based IFU for the 4.2-meter William Herschel Telescope on La Palma. The fibre bundle will consist of 238 fibres, each 3.0 arcsec in diameter, piping light from the Nasmyth focal plane of the WHT to the existing WYFFOS bench spectrograph. A total of 217 fibres will be densely packed to span a hexagonal field of view of 64 × 55 arcsec. The remaining 21 fibres will collect light from the sky background. SixPak is optimized for 2-dimensional spectroscopy at intermediate resolutions of extended objects of low surface brightness. At Nasmyth focus, a focal reducer matches the f-ratio of the telescope (f/11) to the "optimal" f-ratio of the fibres (f/3) to reduce the losses due to focal ratio degradation in the fibres. Microlenses convert the output f-ratio of the fibres to the f-ratio of the WYFFOS collimator (f/8.2). By means of an exchangeable slit at the pupils of the microlenses, a spectral resolution of R = 10,000 can be achieved. The intention is that SixPak will be open for general use in order to allow easy access to the broadest possible astronomical community.