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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Performance of VERA in 10 micro-arcsecond astrometry
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Performance of VERA in 10 micro-arcsecond astrometry

机译：Vera在10个微弧形的artometry中的表现

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摘要

Very Long Baseline Interferometry (VLBI) astrometry using the phase-referencing technique remains an open issue for the quantitative characterization of the observing conditions to achieve a feasible parallax precision of 10 micro-arcseconds (mu as). To address this issue, we evaluated the astrometric performance of the VLBI Exploration of Radio Astrometry (VERA) through the parallax measurements of five distant star-forming regions under good observing conditions of close separations (0.degrees 5-1.degrees 3) and high elevations (>= 50 degrees) Their parallaxes measured 89-200 mu as, corresponding to distances of 5-11 kpc with an error of 11-20 mu as. Furthermore, we investigated the contributions to the position error budget and concluded that the tropospheric residual contribution is the dominant error source. We also confirmed that the astrometric error propagation strongly depends on the term Delta sec Z, which stands for the difference between sec Z of the target and its reference source, where Z is the zenith angle during the observations. We found that for a source pair with a Delta sec Z less than 0.01 (for example, a set of a close separation of <= 0.degrees 5 and a high elevation of >= 50 degrees), we can achieve the parallax precision of 10 mu as using a typical monitoring program comprising 10 observing epochs over a span of two years.
机译：使用相位参考技术的甚长基线干涉测量（VLBI）天体测量仍然是观测条件定量表征的一个开放问题，以实现10微弧秒（μa）的可行视差精度。为了解决这个问题，我们评估了VLBI射电天体测量探索（VERA）的天体测量性能，通过对五个遥远的恒星形成区域的视差测量，在密切分离（0.5-1.3度）和高海拔（>=50度）的良好观测条件下，它们的视差测量为89-200μm，对应于5-11 kpc的距离，误差为11-20μA。此外，我们还研究了位置误差收支的贡献，得出对流层剩余贡献是主要误差源的结论。我们还确认，天体测量误差的传播强烈依赖于术语Delta sec Z，它表示目标与其参考源的sec Z之间的差异，其中Z是观测期间的天顶角。我们发现，对于Delta sec Z小于0.01的源对（例如，一组近距小于等于0.5度、高海拔大于等于50度的源对），我们可以在两年的时间内使用包含10个观测时段的典型监控程序，实现10μ的视差精度。

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    Nagayama Takumi; Kobayashi Hideyuki; Hirota Tomoya; Honma Mareki; Jike Takaaki; Kim Mi Kyoung; Nakagawa Akiharu; Omodaka Toshihiro; Oyama Tomoaki; Sakai Daisuke; Shibata Katsunori M.; Tamura Yoshiaki;

  • 作者单位

    Natl Astron Observ Japan Mizusawa VLBI Observ Mizusawa Ku 2-12 Hoshigaoka Cho Oshu Iwate 0230861 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ 2-21-1 Osawa Mitaka Tokyo 1818588 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ 2-21-1 Osawa Mitaka Tokyo 1818588 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ Mizusawa Ku 2-12 Hoshigaoka Cho Oshu Iwate 0230861 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ Mizusawa Ku 2-12 Hoshigaoka Cho Oshu Iwate 0230861 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ Mizusawa Ku 2-12 Hoshigaoka Cho Oshu Iwate 0230861 Japan;

    Kagoshima Univ Grad Sch Sci &

    Engn 1-21-35 Korimoto Kagoshima Kagoshima 8900065 Japan;

    Kagoshima Univ Grad Sch Sci &

    Engn 1-21-35 Korimoto Kagoshima Kagoshima 8900065 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ Mizusawa Ku 2-12 Hoshigaoka Cho Oshu Iwate 0230861 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ Mizusawa Ku 2-12 Hoshigaoka Cho Oshu Iwate 0230861 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ 2-21-1 Osawa Mitaka Tokyo 1818588 Japan;

    Natl Astron Observ Japan Mizusawa VLBI Observ Mizusawa Ku 2-12 Hoshigaoka Cho Oshu Iwate 0230861 Japan;

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  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

    astrometry; parallaxes; techniques: high angular resolution;

    机译：artomary;视差;技术：高角度分辨率;

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