事件视界尺度上人马座A*的持久非对称结构
星系天体物理
2016-04-06 v1 高能天体物理现象
天体物理仪器与方法
摘要
银河系中心黑洞人马座A*（Sgr A*）是事件视界望远镜（EHT）的主要观测目标，该望远镜能够分辨该源在角尺度上与广义相对论阴影相当的1.3毫米辐射。以往的EHT观测利用可见度振幅来推断毫米波辐射的形态。相位中包含着可能丰富得多的源信息。我们报道了EHT在4年间共13个观测夜晚获得的Sgr A*的1.3毫米相位信息。采用闭合相位（沿干涉仪基线闭合三角形上可见度相位之和）是因为它们对仪器和快速变化大气引入的相位损坏具有鲁棒性。包含加利福尼亚、夏威夷和亚利桑那望远镜的三角形上的中位闭合相位非零。这一结果确凿地表明毫米波辐射在几个史瓦西半径尺度上是不对称的，并可用于打破仅由振幅数据固有的180度旋转模糊。在大多数观测夜晚闭合相位符号的稳定性表明Sgr A*图像中存在持久的非对称性，且未被视线方向上星际电子的折射所掩盖。
引用
@article{arxiv.1602.05527,
title = {Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales},
author = {Vincent L. Fish and Michael D. Johnson and Sheperd S. Doeleman and Avery E. Broderick and Dimitrios Psaltis and Ru-Sen Lu and Kazunori Akiyama and Walter Alef and Juan Carlos Algaba and Keiichi Asada and Christopher Beaudoin and Alessandra Bertarini and Lindy Blackburn and Ray Blundell and Geoffrey C. Bower and Christiaan Brinkerink and Roger Cappallo and Andrew A. Chael and Richard Chamberlin and Chi-Kwan Chan and Geoffrey B. Crew and Jason Dexter and Matt Dexter and Sergio A. Dzib and Heino Falcke and Robert Freund and Per Friberg and Christopher H. Greer and Mark A. Gurwell and Paul T. P. Ho and Mareki Honma and Makoto Inoue and Tim Johannsen and Junhan Kim and Thomas P. Krichbaum and James Lamb and Jonathan León-Tavares and Abraham Loeb and Laurent Loinard and David MacMahon and Daniel P. Marrone and James M. Moran and Monika Mościbrodzka and Gisela N. Ortiz-León and Tomoaki Oyama and Feryal Özel and Richard L. Plambeck and Nicolas Pradel and Rurik A. Primiani and Alan E. E. Rogers and Katherine Rosenfeld and Helge Rottmann and Alan L. Roy and Chester Ruszczyk and Daniel L. Smythe and Jason SooHoo and Justin Spilker and Jordan Stone and Peter Strittmatter and Remo P. J. Tilanus and Michael Titus and Laura Vertatschitsch and Jan Wagner and John F. C. Wardle and Jonathan Weintroub and David Woody and Melvyn Wright and Paul Yamaguchi and André Young and Ken H. Young and J. Anton Zensus and Lucy M. Ziurys},
journal= {arXiv preprint arXiv:1602.05527},
year = {2016}
}
备注
11 pages, accepted to ApJ