对PPMXL固有运动的整体修正
A Global Correction to PPMXL Proper Motions
摘要:
在本文中,我们注意到,河外源似乎有非零自行在PPMXL自行目录。我们收集了一个大的,全天样本的河外天体,并适合他们的报告PPMXL自行车的一个合奏的球谐星壳。因此,构造了幅度相关的自行校正。这种修正被应用于一组基本射电源、类星体,并与类似的修正进行比较以评估其效用。我们出版,随着本文,代码,可用于纠正自行在PPMXL目录在整个天空有2微米全天巡天测光。
英文摘要:
In this paper we notice that extragalactic sources seem to have non-zero proper motions in the PPMXL proper motion catalog. We collect a large, all-sky sample of extragalactic objects and fit their reported PPMXL proper motions to an ensemble of spherical harmonics in magnitude shells. A magnitude dependent proper motion correction is thus constructed. This correction is applied to a set of fundamental radio sources, quasars, and is compared to similar corrections to assess its utility. We publish, along with this paper, code which may be used to correct proper motions in the PPMXL catalog over the full sky which have 2 Micron All Sky Survey photometry.
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