The Event Horizon Telescope relies on 13 global observatories collecting high-speed radio emissions to observe superheated gas around black holes, but synchronizing and correlating this data requires immense computational power. Developed with the Harvard-Smithsonian Center for Astrophysics and MIT Haystack Observatory, cuPhoton.xBeam functions as an FX correlator that bypasses central processing unit limitations. Running on an NVIDIA Vera Rubin NVL72 platform, the software reorganized and loaded raw telescope voltages directly into GPU memory to deliver an unprecedented speedup. This accelerated pipeline outputs the critical complex visibilities required to calibrate and construct final as…
Key points
The GPU-accelerated software operates roughly 460 times faster than traditional CPU-based…: The GPU-accelerated software operates roughly 460 times faster than traditional CPU-based systems when correlating raw telescope recordings.
The cuPhoton.xBeam tool organizes telescope inputs and feeds complex visibilities into do…: The cuPhoton.xBeam tool organizes telescope inputs and feeds complex visibilities into downstream calibration and image reconstruction algorithms.
These processing improvements will support future observational projects, including the n…: These processing improvements will support future observational projects, including the next-generation EHT and the proposed Black Hole Explorer.
Sources checked by our analysis pipeline: 1
Imaging black holes is challenging because they are distant and appear tiny in the sky—for example, M87*’s observed ring spans just 42 microarcseconds. The black hole itself emits no light, so telescopes capture radio emission from superheated gas swirling outside the event horizon. The black hole’s intense gravity bends the paths of this light, shaping the bright ring that frames the central shadow.
The Event Horizon Telescope (EHT) addresses this challenge by linking 13 radio observatory stations across locations, including Hawaii, Chile, Spain, Mexico, and the South Pole, through very-long-baseline interferometry (VLBI). These stations record millimeter and submillimeter radio signals as high-speed voltage streams, which are synchronized and combined to reconstruct detailed images. The next-generation EHT (ngEHT) aims to add observing sites to improve image quality and track changes around black holes over time.
This post walks through GPU-based interferometry with cuPhoton.xBeam, from reading telescope recordings to generating visibilities and scaling across multiple GPUs. These measurements serve as inputs to downstream calibration and image reconstruction, which are outside the scope of this tutorial.
NVIDIA cuPhoton.xBeam performs GPU-based correlation for interferometry…
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