Hybrid Very Long Baseline Interferometry Imaging and Modeling with themis

Avery E. Broderick*, Dominic W. Pesce, Paul Tiede, Hung Yi Pu, Roman Gold


研究成果: 雜誌貢獻期刊論文同行評審

35 引文 斯高帕斯(Scopus)


Generating images from very long baseline interferometric observations poses a difficult, and generally not unique, inversion problem. This problem is simplified by the introduction of constraints, some generic (e.g., positivity of the intensity) and others motivated by physical considerations (e.g., smoothness, instrument resolution). It is further complicated by the need to simultaneously address instrumental systematic uncertainties and sparse coverage in the u-v plane. We report a new Bayesian image reconstruction technique in the parameter estimation framework Themis that has been developed for the Event Horizon Telescope. This has two key features: First, the full Bayesian treatment of the image reconstruction makes it possible to generate a full posterior for the images, permitting a rigorous and quantitative investigation into the statistical significance of image features. Second, it is possible to seamlessly incorporate directly modeled features simultaneously with image reconstruction. We demonstrate this second capability by incorporating a narrow, slashed ring in reconstructions of simulated M87 data in an attempt to detect and characterize the photon ring. We show that it is possible to obtain high-fidelity photon ring sizes, enabling mass measurements with accuracies of 2%-5% that are essentially insensitive to astrophysical uncertainties, and creating opportunities for precision tests of general relativity.

期刊Astrophysical Journal
出版狀態已發佈 - 2020 7月 20

ASJC Scopus subject areas

  • 天文和天體物理學
  • 空間與行星科學


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