中文

ALMA 定相系统:一种用于(亚)毫米波长超高分辨率科学的波束成形能力

天体物理仪器与方法 2017-12-27 v1

摘要

阿塔卡马毫米/亚毫米波阵列(Atacama Millimeter/submillimeter Array, ALMA)定相项目(ALMA Phasing Project, APP)已开发并部署了必要的硬件与软件,用于相干叠加各 ALMA 天线的信号,并以甚长基线干涉测量(Very Long Baseline Interferometry, VLBI)数据交换格式记录聚合和。这些波束成形能力使 ALMA 阵列能够整体充当等效的单口径大天线,并参与全球 VLBI 阵列。在现有工作于(亚)毫米波长的 VLBI 网络中纳入定相 ALMA,可提供数量级般的灵敏度提升,以及 u-v 覆盖和南北角分辨率的增强。定相 ALMA 的可用性使得广泛的新型超高角分辨率科学应用成为可能,包括在事件视界尺度上分辨超大质量黑洞,以及研究天体物理喷流的启动与准直。它还提供了一个高灵敏度孔径,可用于诸如高频脉冲星搜索等研究。本文概述了 ALMA 定相系统的设计、实现与性能特征。

关键词

引用

@article{arxiv.1711.06770,
  title  = {The ALMA Phasing System: A Beamforming Capability for Ultra-High-Resolution Science at (Sub)Millimeter Wavelengths},
  author = {L. D. Matthews and G. B. Crew and S. S. Doeleman and R. Lacasse and A. Saez and W. Alef and K. Akiyama and R. Amestica and J. M. Anderson and D. A. Barkats and A. Baudry and D. Brogiere and R. Escoffier and V. L. Fish and J. Greenberg and M. H. Hecht and R. Hiriart and A. Hirota and M. Honma and P. T. P. Ho and C. M. V. Impellizzeri and M. Inoue and Y. Kohno and B. Lopez and I. Marti-Vidal and H. Messias and Z. Meyer-Zhao and M. Mora-Klein and N. M. Nagar and H. Nishioka and T. Oyama and V. Pankratius and J. Perez and N. Phillips and N. Pradel and H. Rottmann and A. L. Roy and C. A. Ruszczyk and B. Shillue and S. Suzuki and R. Treacy},
  journal= {arXiv preprint arXiv:1711.06770},
  year   = {2017}
}

备注

Accepted to PASP; 23 pages