GALLIFRAY -- A geometric modeling and parameter estimation framework for black hole images using bayesian techniques
arXiv:2212.06827 · doi:10.3847/1538-4357/acc6d3
Abstract
Recent observations of the galactic centers of M87 and the Milky Way with the Event Horizon Telescope have ushered in a new era of black hole based tests of fundamental physics using very long baseline interferometry (VLBI). Being a nascent field, there are several different modeling and analysis approaches in vogue (e.g., geometric and physical models, visibility and closure amplitudes, agnostic and multimessenger priors). We present \texttt{GALLIFRAY}, an open-source Python-based framework for estimation/extraction of parameters using VLBI data. It is developed with modularity, efficiency, and adaptability as the primary objectives. This article outlines the design and usage of \texttt{GALLIFRAY}. As an illustration, we fit a geometric and a physical model to simulated datasets using markov chain monte carlo sampling and find good convergence of the posterior distribution. We conclude with an outline of further enhancements currently in development.
10 pages, 5 figures; accepted for publication in ApJ
References in corpus (14)
- First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
- First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
- First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
- Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
- First Sagittarius A* Event Horizon Telescope Results. VI: Testing the Black Hole Metric
- Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
- First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
- First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass
- Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
- RadioAstron -- a Telescope with a Size of 300 000 km: Main Parameters and First Observational Results
- General relativistic effects on the orbit of the S2 star with GRAVITY
- A D-term Modeling Code (DMC) for simultaneous calibration and full-Stokes imaging of very long baseline interferometric data
- First Space-VLBI Observations of Sagittarius A*
- Orbit Tomography of Binary Supermassive Black Holes with Very Long Baseline Interferometry