Positioning Errors and Efficiency in Fiber Spectrographs
Positioning Errors and Efficiency in Fiber Spectrographs
复制标题
光纤光谱仪中的定位误差和效率
DOI：
10.1086/341715
复制
发表时间：
2002
影响因子：
3.5
通讯作者：
P. Newman
中科院分区：
文献类型：
--
作者：
P. Newman
The use of wide‐field multiobject fiber‐input spectrographs for large redshift surveys introduces the possibility of variations in the observed signal‐to‐noise ratio across the survey area due to errors in positioning the fibers with respect to the target image positions, leading to position‐dependent errors in the survey catalog. This paper brings together a comprehensive description of the sources of fiber‐to‐image position errors in different instrument designs and quantifies their effects on the efficiency with which signal is recorded. For point sources, a function relating a fractional efficiency and an equivalent aperture correction to the fiber‐to‐image position error, the fiber diameter, and the image size is plotted for typical values of fiber and image sizes found in current instruments. The tools required by observers to maximize the efficiency of fiber‐spectrographic surveys are discussed.
