Imaging the Sagittarius A* Event Horizon using Space-Based Very Long Baseline Radio Interferometry (VLBI)

Details Imaging the Sagittarius A* Event Horizon using Space-Based Very Long Baseline Radio Interferometry (VLBI) Imaging the Sagittarius A* Event Horizon using Space-Based Very Long Baseline Radio Interferometry (VLBI)

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.5601r&link_type=abstract

American Astronomical Society Meeting 208, #56.01; Bulletin of the American Astronomical Society, Vol. 38, p.136

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Scientific paper

We describe a mission concept to use multiple space-based radio telescopes to the image the event horizon of the Sagittarius A* black hole at the center of our galaxy. In concert with radio telescopes on Earth, two orbiting spacecraft form a three-element radio-interferometric array. The resolution of such an interferometer is diffraction-limited by the wavelength divided by the interferometer baseline; 1 picoradian resolution might be possible for a 1,000,000 km baseline at a frequency of 80 GHz. Each spacecraft would carry a roughly 10-20 m parabolic radio antenna dish. Such a high orbit is gravitationally unstable, and will be achieved and maintained by electric propulsion.The primary science on this mission is the direct imaging of the event horizon of the Sagittarius A* event horizon. Additionally, the extraordinary resolution of this system enables other revolutionary science to be achieved including the imaging of other black hole systems in Active Galactic Nuclei (AGNs), the imaging of nearby pulsar magnetospheres, and direct observations of general relativistic effects such as frame dragging. The viability of imaging radio-emitting extrasolar planets will be evaluated.

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