The ALMA Phasing System: A Beamforming Capability for Ultra-high-resolution Science at (Sub)Millimeter Wavelengths
The ALMA Phasing System: A Beamforming Capability for Ultra-high-resolution Science at (Sub)Millimeter Wavelengths
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DOI：
10.1088/1538-3873/aa9c3d
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发表时间：
2017-11
影响因子：
3.5
通讯作者：
L. Matthews;G. Crew;S. Doeleman;S. Doeleman;R. Lacasse;A. Saez;W. Alef;K. Akiyama;R. Amestica;J. Anderson;D. Barkats;A. Baudry;D. Broguiere;R. Escoffier;V. Fish;Joe Greenberg;M. Hecht;R. Hiriart;A. Hirota;M. Honma;P. Ho;C. Impellizzeri;M. Inoue;Y. Kohno;B. López;I. Martí-Vidal;H. Messias;Z. Meyer-Zhao;M. Mora-Klein;N. Nagar;H. Nishioka;T. Oyama;V. Pankratius;Jesus Perez;N. Phillips;N. Pradel;H. Rottmann;A. Roy;C. Ruszczyk;B. Shillue;S. Suzuki;R. Treacy
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文献类型：
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作者：
L. Matthews;G. Crew;S. Doeleman;S. Doeleman;R. Lacasse;A. Saez;W. Alef;K. Akiyama;R. Amestica;J. Anderson;D. Barkats;A. Baudry;D. Broguiere;R. Escoffier;V. Fish;Joe Greenberg;M. Hecht;R. Hiriart;A. Hirota;M. Honma;P. Ho;C. Impellizzeri;M. Inoue;Y. Kohno;B. López;I. Martí-Vidal;H. Messias;Z. Meyer-Zhao;M. Mora-Klein;N. Nagar;H. Nishioka;T. Oyama;V. Pankratius;Jesus Perez;N. Phillips;N. Pradel;H. Rottmann;A. Roy;C. Ruszczyk;B. Shillue;S. Suzuki;R. Treacy
阿塔卡马毫米/亚毫米阵列（阿尔马）定相项目（APP）已经开发和部署了对单个阿尔马天线的信号进行相干求和并以甚长基线干涉测量（VLBI）数据交换格式记录总和所需的硬件和软件。这些波束形成能力使阿尔马阵列共同作为一个单一的大孔径等效功能，并参与全球VLBI阵列。在目前的VLBI网络中，相位阿尔马在（亚）毫米波长工作，提供了一个数量级的灵敏度的改善，以及在u-v覆盖和南北角分辨率的增强。有了分阶段的阿尔马，就可以进行各种新的超高角分辨率科学应用，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发射和准直。它还提供了一个高灵敏度的孔径，可用于调查，如脉冲星搜索在高频率。本文概述了阿尔马定相系统的设计、实施和性能特点。
The Atacama Millimeter/submillimeter Array (ALMA) Phasing Project (APP) has developed and deployed the hardware and software necessary to coherently sum the signals of individual ALMA antennas and record the aggregate sum in Very Long Baseline Interferometry (VLBI) Data Exchange Format. These beamforming capabilities allow the ALMA array to collectively function as the equivalent of a single large aperture and participate in global VLBI arrays. The inclusion of phased ALMA in current VLBI networks operating at (sub)millimeter wavelengths provides an order of magnitude improvement in sensitivity, as well as enhancements in u–v coverage and north–south angular resolution. The availability of a phased ALMA enables a wide range of new ultra-high angular resolution science applications, including the resolution of supermassive black holes on event horizon scales and studies of the launch and collimation of astrophysical jets. It also provides a high-sensitivity aperture that may be used for investigations such as pulsar searches at high frequencies. This paper provides an overview of the ALMA Phasing System design, implementation, and performance characteristics.