标题： 使用MOPEX提取点源 显示英文标题

标题： Point Source Extraction with MOPEX

摘要： MOPEX（Mosaicking and Point source EXtraction）是斯皮策科学中心开发的一套天文图像处理软件包。我们报告了MOPEX的点源提取能力。 点源提取被实现为两个步骤的过程：点源检测和轮廓拟合。可以选用地对输入图像进行非线性匹配滤波，以提高信噪比并改善微弱点源的检测效果。点响应函数（PRF）拟合点源生成最终的点源列表，其中包括点源的流量和改进后的位置，以及其他描述拟合特性的参数。被动和主动解混允许成功拟合混淆的点源。对于每个提取的点源，可以计算任意数量孔径大小的光度值。PRF直接从输入图像中估算。 高效的背景和噪声估计方法的实现，以及修改后的单纯形算法，有助于提高MOPEX的计算效率。该软件包是以一组松散连接的perl脚本形式实现的，其中每个脚本运行多个用C/C++编写的模块。通过namelists（命名列表），即ASCII配置文件来设置输入参数。 我们将点源提取应用到斯皮策星系外第一轮巡天中由多波段成像照相机（MIPS）在24和70微米拍摄的镶嵌图像，以及数字天空巡天图像上。使用模拟数据计算了点源提取的完整性和可靠性。 显示英文摘要

摘要： MOPEX (MOsaicking and Point source EXtraction) is a package developed at the Spitzer Science Center for astronomical image processing. We report on the point source extraction capabilities of MOPEX. Point source extraction is implemented as a two step process: point source detection and profile fitting. Non-linear matched filtering of input images can be performed optionally to increase the signal-to-noise ratio and improve detection of faint point sources. Point Response Function (PRF) fitting of point sources produces the final point source list which includes the fluxes and improved positions of the point sources, along with other parameters characterizing the fit. Passive and active deblending allows for successful fitting of confused point sources. Aperture photometry can also be computed for every extracted point source for an unlimited number of aperture sizes. PRF is estimated directly from the input images. Implementation of efficient methods of background and noise estimation, and modified Simplex algorithm contribute to the computational efficiency of MOPEX. The package is implemented as a loosely connected set of perl scripts, where each script runs a number of modules written in C/C++. Input parameter setting is done through namelists, ASCII configuration files. We present applications of point source extraction to the mosaic images taken at 24 and 70 micron with the Multiband Imaging Photometer (MIPS) as part of the Spitzer extragalactic First Look Survey and to a Digital Sky Survey image. Completeness and reliability of point source extraction is computed using simulated data.