Queen's University

Published purpose

To clearly map small and distant objects in space, such as black holes in nearby galaxies, astronomers point radio telescopes from all over the world at the same location in the sky. Later, they combine the recorded light waveforms using software on powerful computers, generating an interference pattern that can be used to map out the distant object, as though it was observed with a telescope the size of the Earth. The goal of the Balloon-borne Very Long Baseline Interferometry Experiment (BVEX) is to demonstrate that a telescope suspended from a high-altitude stratospheric balloon can be used as an interferometry station. Stratospheric balloons operate above 99.5% of the Earth’s atmosphere, so they should be ideal for observing the high frequency light needed to resolve more distant black hole shadows. To achieve this goal, BVEX will use a GPS system and accelerometers to track the 3-D position of a small radio telescope to an unprecedented resolution. This project will demonstrate stratospheric balloon interferometry at cm wavelengths, and provide practice to students in the field of space-like missions and interferometry, offering training for a new generation of highly qualified scientists, engineers, high-tech and aerospace professionals. The results obtained in this experiment will be used to launch similar, follow-on projects in the future.