Local Pixel Bundles: Bringing the Pixels to the People
Local Pixel Bundles: Bringing the Pixels to the People
复制标题
本地像素捆绑包：将像素带给人们
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Jay Anderson
中科院分区：
文献类型：
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作者：
Jay Anderson
为前沿场项目（hst2galign，见Anderson & Ogaz 2014和http://www.stsci.edu/hst/campaigns/frontier-fields/）开发的基于星系的自动校准软件包可以直接将每个科学曝光的flt框架的像素映射到一个共同的主框架中。我们可以使用这些映射来提取感兴趣源附近的flt像素，并将它们打包成一个方便的“bundle”。除了像素之外，这个数据包还可以包含“元”信息，允许用户将位置从flt像素转换为参考帧，反之亦然。由于flt帧中未重新采样的像素是我们在天文场景中唯一真正的约束，因此将这些像素相互关联的能力将使许多高精度研究成为可能，例如：精确的psf点源拟合和反卷积，轻松探索不同的图像组合算法，以及精确的微弱源查找和光度测定。在这个ISR中引入的数据产品是一个非常早期的尝试，它在一个包中提供了flt级别的像素约束，而不仅仅是少数HST天体测量专家可以访问。我们希望社区中的用户可以开始使用它们，并提供反馈，说明他们希望在捆绑包中看到哪些信息，以及他们认为哪些通用分析包可能有用。由于这个原因，这个文档有点非正式，因为我知道它会随着产品和工具的优化而被修改和更新。
The automated galaxy-based alignment software package developed for the Frontier Fields program (hst2galign, see Anderson & Ogaz 2014 and http://www.stsci.edu/hst/campaigns/frontier-fields/) produces a direct mapping from the pixels of the flt frame of each science exposure into a common master frame. We can use these mappings to extract the flt-pixels in the vicinity of a source of interest and package them into a convenient “bundle”. In addition to the pixels, this data bundle can also contain “meta” information that will allow users to transform positions from the flt pixels to the reference frame and vice-versa. Since the un-resampled pixels in the flt frames are the only true constraints we have on the astronomical scene, the ability to inter-relate these pixels will enable many high-precision studies, such as: point-source-fitting and deconvolution with accurate PSFs, easy exploration of different image-combining algorithms, and accurate faint-source finding and photometry. The data products introduced in this ISR are a very early attempt to provide the flt-level pixel constraints in a package that is accessible to more than the handful of experts in HST astrometry. The hope is that users in the community might begin using them and will provide feedback as to what information they might want to see in the bundles and what general analysis packages they might find useful. For that reason, this document is somewhat informally written, since I know that it will be modified and updated as the products and tools are optimized.