ASTRO-F/FIS Observing Simulation: Detection Limits for Point Sources
ASTRO-F/FIS Observing Simulation: Detection Limits for Point Sources
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ASTRO-F/FIS 观测模拟：点源的检测极限
DOI：
10.1093/pasj/55.3.717
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发表时间：
2002
影响因子：
2.3
通讯作者：
H. Shibai
中科院分区：
文献类型：
--
作者：
W. Jeong;S. Pak;Hyung;T. Nakagawa;Jungjoo Sohn;Insun Ahn;I. Yamamura;Masaru Watanabe;M. Kawada;H. Shibai
我们描述了观测模拟软件FISVI（FIS虚拟仪器），这是开发的远红外测量（FIS），将在日本的红外天文使命ASTRO-F。FISVI有两个目的：一是对ASTRO-F/FIS的总体技术指标和性能进行检查，二是在发射前为数据分析软件准备输入数据集。在FISVI中，特别注意引入了“编译PSF（点扩散函数）”来优化不可避免但耗时的卷积过程。通过编译PSF，我们将计算时间减少了一个数量级。模拟中包括光子噪声和读出噪声。我们估计的点源的检测极限模拟的虚拟补丁的天空主要由遥远的星系。我们研究了简单幂律模型的源混淆的重要性，N（>S），比S亮的源的数量。我们发现，源混淆起着主导作用的检测限，只有快速光度演变的星系计数，其演变建议最近的观测模型。
We describe the observing simulation software FISVI (FIS Virtual Instrument), which was developed for the Far-Infrared Surveyor (FIS) that will be on the Japanese infrared astronomy mission ASTRO-F. The FISVI has two purposes: one is to check the specifications and performances of the ASTRO-F/FIS as a whole; the other is to prepare input data sets for the data analysis softwares prior to launch. In the FISVI, special care was taken by introducing the “Compiled PSF (Point Spread Function)” to optimise inevitable, but time-consuming, convolution processes. With the Compiled PSF, we reduce the computation time by an order of magnitude. The photon and readout noises are included in the simulations. We estimate the detection limits for point sources from the simulation of virtual patches of the sky mostly consisting of distant galaxies. We studied the importance of source confusion for simple power-law models for N( >S ), the number of sources brighter than S. We found that source confusion plays a dominant role in the detection limits only for models with rapid luminosity evolution for the galaxy counts, the evolution of which is suggested by recent observations.