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26 April 2024 |
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On the prospects of imaging Sagittarius A* from space | | Freek Roelofs
; Heino Falcke
; Christiaan Brinkerink
; Monika Moscibrodzka
; Leonid I. Gurvits
; Manuel Martin-Neira
; Volodymyr Kudriashov
; Marc Klein-Wolt
; Remo Tilanus
; Michael Kramer
; Luciano Rezzolla
; | | Date: |
4 May 2020 | | Abstract: | Very Long Baseline Interferometry (VLBI) at sub-millimeter waves has the
potential to image the shadow of the black hole in the Galactic Center,
Sagittarius A* (Sgr A*), and thereby test basic predictions of the theory of
general relativity. We investigate the imaging prospects of a new Space VLBI
mission concept. The setup consists of two satellites in polar or equatorial
circular Medium-Earth Orbits with slightly different radii, resulting in a
dense spiral-shaped uv-coverage with long baselines, allowing for extremely
high-resolution and high-fidelity imaging of radio sources. We simulate
observations of a general relativistic magnetohydrodynamics model of Sgr A* for
this configuration with noise calculated from model system parameters. After
gridding the $uv$-plane and averaging visibilities accumulated over multiple
months of integration, images of Sgr A* with a resolution of up to 4 $mu$as
could be reconstructed, allowing for stronger tests of general relativity and
accretion models than with ground-based VLBI. | | Source: | arXiv, 2005.1339 | | Services: | Forum | Review | PDF | Favorites | |
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