论文标题

用于最佳差分光度法的基因座算法点的目录23,779类星

A Catalogue of Locus Algorithm Pointings for Optimal Differential Photometry for 23,779 Quasars

论文作者

Creaner, Oisín, Nolan, Kevin, Grennan, David, Smith, Niall, Hickey, Eugene

论文摘要

本文介绍了从斯隆数字天空调查(SDSS)目录中提取的23,779种类星体的差分光度法的目录,每个分数都表明了与指向相关的视野(FOV)的质量。在分钟的时间表上观察毫米级的变化通常需要参考参考恒星的合奏进行差异观察。为了获得最佳性能,这些参考星应具有与目标类星体相似的颜色和幅度。此外,通过使用望远镜指向,可以找到合适的参考星的最大数量和质量,该望远镜指向将目标对象从视野中心偏离目标对象。通过将每个类星体与SDSS目录中的天空中的恒星进行比较,可以计算出最佳指向,并将其符合图形称为该指向的“得分”。已经开发了高度灵活的软件,以使该过程能够在分布式计算范式中自动化和实现,从而可以在给定一组输入目标的情况下创建指数目录。将此技术应用于第4个SDSS类星体目录的40,000个目标样本,从而产生了23,779种类星体的指数和得分。该目录是计划差分光度法研究和类星体调查的观察者的有用资源

This paper presents a catalogue of optimised pointings for differential photometry of 23,779 quasars extracted from the Sloan Digital Sky Survey (SDSS) Catalogue and a score for each indicating the quality of the Field of View (FoV) associated with that pointing. Observation of millimagnitude variability on a timescale of minutes typically requires differential observations with reference to an ensemble of reference stars. For optimal performance, these reference stars should have similar colour and magnitude to the target quasar. In addition, the greatest quantity and quality of suitable reference stars may be found by using a telescope pointing which offsets the target object from the centre of the field of view. By comparing each quasar with the stars which appear close to it on the sky in the SDSS Catalogue, an optimum pointing can be calculated, and a figure of merit, referred to as the "score" calculated for that pointing. Highly flexible software has been developed to enable this process to be automated and implemented in a distributed computing paradigm, which enables the creation of catalogues of pointings given a set of input targets. Applying this technique to a sample of 40,000 targets from the 4th SDSS quasar catalogue resulted in the production of pointings and scores for 23,779 quasars. This catalogue is a useful resource for observers planning differential photometry studies and surveys of quasars to select those which have many suitable celestial neighbours for differential photometry

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