论文标题
NGEHT分析挑战
The ngEHT Analysis Challenges
论文作者
论文摘要
下一代事件地平线望远镜（NGEHT）将是事件地平线望远镜（EHT）阵列的显着增强，并带有$ \ sim 10 $新天线和现有天线的仪器升级。 $ UV $覆盖，灵敏度和频率覆盖范围增加，可以探索各种各样的新科学机会。已经发起了NGEHT分析挑战，以告知NGEHT阵列设计，科学目标和分析途径的开发。对于每个挑战，合成EHT和NGEHT数据集都是从理论源模型生成的，并将其发布给挑战参与者，他们使用图像重建和其他方法分析数据集。提交的分析结果通过定量指标进行评估。在这项工作中，我们报告了前两个NGEHT分析挑战。这些重点是M87*和SGR A*的静态和动力学模型，并表明使用当前的分析Algorithms，可以通过参考NGEHT阵列在现实的观察条件下在现实观察条件下在现实观察条件下在参考NGEHT阵列中重建M87*和接近Horizon的小时时间量表的高质量电影。我们确定仍有改进这些算法和分析策略的领域。其他科学案例和阵列将在未来的挑战中探索。
The next-generation Event Horizon Telescope (ngEHT) will be a significant enhancement of the Event Horizon Telescope (EHT) array, with $\sim 10$ new antennas and instrumental upgrades of existing antennas. The increased $uv$-coverage, sensitivity, and frequency coverage allow a wide range of new science opportunities to be explored. The ngEHT Analysis Challenges have been launched to inform development of the ngEHT array design, science objectives, and analysis pathways. For each challenge, synthetic EHT and ngEHT datasets are generated from theoretical source models and released to the challenge participants, who analyze the datasets using image reconstruction and other methods. The submitted analysis results are evaluated with quantitative metrics. In this work, we report on the first two ngEHT Analysis Challenges. These have focused on static and dynamical models of M87* and Sgr A*, and shown that high-quality movies of the extended jet structure of M87* and near-horizon hourly timescale variability of Sgr A* can be reconstructed by the reference ngEHT array in realistic observing conditions, using current analysis algorithms. We identify areas where there is still room for improvement of these algorithms and analysis strategies. Other science cases and arrays will be explored in future challenges.
