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The catalogue of positions of optically bright extragalactic radio sources OBRS-2

机译:光学明亮河外无线电的位置目录   来源OBRs-2

摘要

It is anticipated that future space-born missions, such as Gaia, will be ableto determine in optical domain positions of more than 100,000 bright quasarswith sub-mas accuracies that are comparable to very long baselineinterferometry (VLBI) accuracies. Comparisons of coordinate systems fromspace-born missions and from VLBI will be very important, first forinvestigation of possible systematic errors, second for investigation ofpossible shift between centroids of radio and optical emissions in activegalaxy nuclea. In order to make such a comparison more robust, a program ofdensification of the grid of radio sources detectable with both VLBI and Gaiawas launched in 2006. In the second observing campaign a set of 290 objectsfrom the list of 398 compact extragalactic radio sources with declinationsgreater -10 deg was observed with the VLBA+EVN in 2010-2011 with the primarygoal of producing their images with milliarcsecond resolution. These sourcesare brighter than 18 magnitude at V band. In this paper coordinates of observedsources have been derived with milliarcsecond accuracies from analysis of theseVLBI observations following the method of absolute astrometry and their imageswere produced. The catalogue of positions of 295 target sources and estimatesof their correlated flux densities at 2.2 and 8.4 GHz is presented. Theaccuracies of source coordinates are in a range of 2 to 200 mas, with themedian 3.2 mas.
机译:预计未来的太空任务,例如盖亚(Gaia),将能够确定10万多个明亮的类星体在光域中的位置,其子质量精度可与超长基线干涉测量(VLBI)精度相媲美。来自太空飞行任务和VLBI的坐标系的比较将非常重要,首先是研究可能的系统误差,其次是研究活动星系核中无线电质心和光发射质心之间的可能偏移。为了使这种比较更加鲁棒,2006年启动了利用VLBI和Gaiawa都可以探测到的无线电源网格的浓缩计划。在第二次观测活动中,398个紧凑的银河外无线电源列表中有290个物体出现了偏角,这是更大的-在2010-2011年间,使用VLBA + EVN观察到10度,其首要目标是产生具有毫秒级分辨率的图像。这些光源在V波段比18幅度亮。本文采用绝对天文学的方法,通过对这些VLBI观测值的分析,以毫秒级精度推导了观测源的坐标,并生成了它们的图像。介绍了295个目标源的位置目录,以及它们在2.2 GHz和8.4 GHz时的相关通量密度估计值。源坐标的精度范围为2到200 mas,主题坐标为3.2 mas。

著录项

  • 作者

    Petrov, Leonid;

  • 作者单位
  • 年度 2013
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
  • 中图分类

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