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arXiv 1209.1200astro-ph.IM
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用于宽视场天文学的超快速图像Generator(UFig)

An Ultra Fast Image Generator (UFig) for wide-field astronomy

Joel Bergé, Lukas Gamper, Alexandre Réfrégier, Adam Amara

摘要:

模拟的宽视场图像正在成为观测天文学的一个重要组成部分,无论是为新的调查做准备还是测试测量方法。为了有效地探索巨大的参数空间,仿真代码的计算速度是其实现的核心要求。我们介绍了超快速图像生成器(UFig),其目的是将宽场成像模拟带到当前计算能力的极限。我们通过以下方式实现这一目标:(1)星系、恒星和观测条件的模型,虽然简单,但捕捉了逼真模拟所需的关键特征,以及(2)最先进的计算和实现优化。我们提出的UFig的性能,并表明它是快于现有的公共模拟代码的几个数量级。它使我们能够比SExtractor更快地生成图像来分析它们。例如,它可以在30秒内在笔记本电脑上模拟一个典型的0.25 deg^2斯巴鲁SuprimeCam图像(10k x 8k像素),5 σ极限星等为R=26,产生一个星系的平均模拟时间为30微秒。该代码是端到端仿真代码的补充,可用作依赖于仿真的观测方法的快速核心组件。

英文摘要:

Simulated wide-field images are becoming an important part of observational astronomy, either to prepare for new surveys or to test measurement methods. In order to efficiently explore vast parameter spaces, the computational speed of simulation codes is a central requirement to their implementation. We introduce the Ultra Fast Image Generator (UFig) which aims to bring wide-field imaging simulations to the current limits of computational capabilities. We achieve this goal through: (1) models of galaxies, stars and observational conditions, which, while simple, capture the key features necessary for realistic simulations, and (2) state-of-the-art computational and implementation optimizations. We present the performances of UFig and show that it is faster than existing public simulation codes by several orders of magnitude. It allows us to produce images more quickly than SExtractor needs to analyze them. For instance, it can simulate a typical 0.25 deg^2 Subaru SuprimeCam image (10k x 8k pixels) with a 5-sigma limiting magnitude of R=26 in 30 seconds on a laptop, yielding an average simulation time for a galaxy of 30 microseconds. This code is complementary to end-to-end simulation codes and can be used as a fast, central component of observational methods relying on simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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