Distinguishing an ejected blob from alternative flare models at the Galactic centre with GRAVITY

Abstract

The black hole at the Galactic centre exhibits regularly flares of radiation, the origin of which is still not understood. In this article, we study the ability of the near-future GRAVITY infrared instrument to constrain the nature of these events. We develop realistic simulations of GRAVITY astrometric data sets for various flare models. We show that the instrument will be able to distinguish an ejected blob from alternative flare models, provided the blob inclination is >= 45deg, the flare brightest magnitude is 14 <= mK <= 15 and the flare duration is >= 1h30.

arXiv comment11 pages, 9 figures, accepted by MNRAS

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• First Light for GRAVITY: Phase Referencing Optical Interferometry for the Very Large Telescope Interferometer
• Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA*
• Sgr A* and General Relativity
• The Milky Way's Supermassive Black Hole: How good a case is it? A Challenge for Astrophysics & Philosophy of Science
• Testing the No-Hair Theorem with Observations of Black Holes in the Electromagnetic Spectrum
• Fast Variability and mm/IR flares in GRMHD Models of Sgr A* from Strong-Field Gravitational Lensing
• The origin of hotspots around Sgr A*: Orbital or pattern motion?
• Magnetic reconnection plasmoid model for Sagittarius A* flares
• Variations in emission from episodic plasmoid ejecta around black holes
• Impact of Schwarzschild black hole's gravity upon the Rossby wave instability
• Testing the validity of the ray-tracing code GYOTO
• On the Rossby Wave Instability in accretion discs surrounding spinning black holes
• Observational signatures from higher-order images of moving hotspots in accretion disks
• Rossby Wave Instability and High-Frequency Quasi-Periodic Oscillations in accretion discs orbiting around black holes
• Sagittarius A* near-infrared flares polarization as a probe of space-time I: Non-rotating exotic compact objects