MeqSilhouette v2: spectrally resolved polarimetric synthetic data generation for the event horizon telescope
MeqSilhouette v2: spectrally resolved polarimetric synthetic data generation for the event horizon telescope
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MeqSilhouette v2：事件视界望远镜的光谱解析偏振合成数据生成
DOI：
10.1093/mnras/stac531
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发表时间：
2022
影响因子：
4.8
通讯作者：
Smirnov, Oleg
中科院分区：
文献类型：
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作者：
Natarajan, Iniyan;Deane, Roger;Martí-Vidal, Iván;Roelofs, Freek;Janssen, Michael;Wielgus, Maciek;Blackburn, Lindy;Blecher, Tariq;Perkins, Simon;Smirnov, Oleg
我们推出了 MeqSilhouette v2.0 (MeqSv2)，这是一款完全偏振、时间和频率分辨的合成数据生成软件，用于通过异构阵列模拟毫米 (mm) 波长超长基线干涉测量 (VLBI) 观测。合成数据是理解真实观测、测试校准和成像算法以及预测现有或拟建站点性能指标的关键组成部分。 MeqSv2 将基于物理的仪器和大气信号损坏应用于数据，这些信号受到根据经验得出的站点和站参数的限制。新版本能够使用无线电干涉测量方程 (RIME) 形式来应用仪器偏振效应和各种其他光谱解析效应，并生成与旨在处理真实数据的校准管道兼容的合成数据。我们使用不同的阵列演示了 MeqSv2 的各种损坏功能，重点关注复杂带通增益对 230 GHz 的 EHT 闭合量的影响。我们通过使用 PolSolve 对合成 EHT 数据执行偏振自校准来验证频率相关偏振泄漏的实现。我们还指出了厘米波长 VLBI 阵列分析和设计的潜在应用以及未来的方向。
We present MeqSilhouette v2.0 (MeqSv2), a fully polarimetric, time-and frequency-resolved synthetic data generation software for simulating millimetre (mm) wavelength very long baseline interferometry (VLBI) observations with heterogeneous arrays. Synthetic data are a critical component in understanding real observations, testing calibration and imaging algorithms, and predicting performance metrics of existing or proposed sites. MeqSv2 applies physics-based instrumental and atmospheric signal corruptions constrained by empirically derived site and station parameters to the data. The new version is capable of applying instrumental polarization effects and various other spectrally resolved effects using the Radio Interferometry Measurement Equation (RIME) formalism and produces synthetic data compatible with calibration pipelines designed to process real data. We demonstrate the various corruption capabilities of MeqSv2 using different arrays, with a focus on the effect of complex bandpass gains on closure quantities for the EHT at 230 GHz. We validate the frequency-dependent polarization leakage implementation by performing polarization self-calibration of synthetic EHT data using PolSolve. We also note the potential applications for cm-wavelength VLBI array analysis and design and future directions.