Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre

Abstract

Most galactic nuclei are now believed to harbour supermassive black holes. Studies of stellar motions in the central few light-years of our Milky Way Galaxy indicate the presence of a dark object with a mass of about 2.6 million solar masses. This object is spatially coincident with Sagittarius A* (Sgr A*), the unique compact radio source located at the dynamical centre of our Galaxy. By analogy with distant quasars and nearby active galactic nuclei (AGN), Sgr A* is thought to be powered by the gravitational potential energy released by matter as it accretes onto a supermassive black hole. However, Sgr A* is much fainter than expected in all wavebands, especially in X-rays, casting some doubt on this model. Recently, we reported the first strong evidence of X-ray emission from Sgr A*. Here we report the discovery of rapid X-ray flaring from the direction of Sgr A*. These data provide compelling evidence that the X-ray emission is coming from accretion onto a supermassive black hole at the Galactic Centre, and the nature of the variations provides strong constraints on the astrophysical processes near the event horizon of the black hole.

4 pages, 3 figures (Figs 1 and 3 in color), LaTeX

References in corpus (2)

• The Supermassive Black Hole at the Galactic Center
• The jet model for Sgr A*: radio and X-ray spectrum

Cited by in corpus (409)

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• The impact of resistivity on the variability of black hole accretion flows
• Effects of wind on radiation spectra from magnetized accretion disks
• New Evidence for a Flux-independent Spectral Index of Sgr A* in the Near-infrared
• Probing the formation of planetesimals in the Galactic Centre using Sgr A* flares
• Effect of matter geometry on low angular momentum black hole accretion in the Kerr metric
• Ray-tracing in four and higher dimensional black holes: An analytical approximation
• Magnetic neutral points and electric lines of force in strong gravity of a rotating black hole
• Possible evidence from the flaring activity of Sgr A* for a star at a distance of ~3.3 Schwarzscild radii from the blackhole
• Charged black holes: Wave equations for gravitational and electromagnetic perturbations
• Observational signatures from higher-order images of moving hotspots in accretion disks
• A Multi-Frequency Study of the Milky Way-like Spiral Galaxy NGC 6744
• Prospects for IXPE and eXTP polarimetric archaeology of the reflection nebulae in the Galactic center
• The frozen (inactive) disk in Sgr A: freezing the accretion of the hot gas too?
• Numerical simulation of small perturbation on an accretion disk due to the collision of a star with the disk near the black hole
• Impact of intrinsic polarisation of Sgr A* historical flares on (polarisation) properties of their X-ray echoes
• Test particles in relativistic resistive magnetohydrodynamics
• X-ray Filament with a Strong 6.7 keV Line in the Galactic Center Region
• Radio Variability of the Sagittarius ${\mathrm{A}}^{\ast }$ due to an Orbiting Star
• Non-thermal Synchrotron Emission and Polarization Signatures during Black Hole Flux Eruptions
• High Energy Activity of the Super-Massive Black Hole at the Galactic Center
• Constraining cosmic-ray acceleration in the magnetospheric gaps of Sgr A*
• Iron K-alpha echoes from the circumnuclear disk orbiting Sgr A*
• Global resistive MHD accretion flows around spinning AGNs: impact of resistivity on MAD state
• The Jet in the Galactic Center: An Ideal Laboratory for Magnetohydrodynamics and General Relativity
• The Galactic Center Black Hole Laboratory
• The Galactic Center
• A Relativistic Disk in Sagittarius A*
• Flares from Galactic centre pulsars: a new class of X-ray transients?
• The X-ray variation of M81* resolved by Chandra and NuSTAR
• Compact stellar systems hosting an intermediate mass black hole: magnetohydrodynamic study of inflow-outflow dynamics
• Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre
• SgrA* emission at 7mm: variability and periodicity
• Extreme magnetic fields around black holes
• Polarimetric Imaging of Sgr A* in its Flaring State
• Chandra Observations of Galactic Center: High Energy Processes at Arcsecond Resolution
• Flares from spiral waves by lensing and time-delay amplification?
• A New X-Ray Flare from the Galactic Nucleus Detected with the XMM-Newton
• The 3 Ms Chandra Campaign on Sgr A*: A Census of X-ray Flaring Activity from the Galactic Center
• News from the year 2006 Galactic Center workshop
• Search for long-term variability of HESS J1745-290
• Sagittarius A* near-infrared flares polarization as a probe of space-time I: Non-rotating exotic compact objects
• High Energy Emission from the Galactic Center
• Kinetic Effects on Turbulence Driven by the Magnetorotational Instability in Black Hole Accretion
• Wave equations for the perturbations of a charged black hole
• On the Nature of the X-ray Emission from the Galactic Center Region
• Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI
• Variability of Sagittarius A* at 3 GHz on minute-scale with MeerKAT
• Tidal Capture by a Black Hole and Flares in Galactic Centres
• Visible shapes of black holes M87* and SgrA*