The Flare Activity of SgrA*; New Coordinated mm to X-Ray Observations

Abstract

We report new simultaneous near-infrared/sub-millimeter/X-ray observations of the SgrA* counterpart associated with the massive 3-4x10**6 solar mass black hole at the Galactic Center. The main aim is to investigate the physical processes responsible for the variable emission from SgrA*. The observations have been carried out using the NACO adaptive optics (AO) instrument at the European Southern Observatory's Very Large Telescope and the ACIS-I instrument aboard the Chandra X-ray Observatory as well as the Submillimeter Array SMA on Mauna Kea, Hawaii, and the Very Large Array in New Mexico. We detected one moderately bright flare event in the X-ray domain and 5 events at infrared wavelengths.

submitted to A&A 26/10/2005; accepted by A&A: 14/12/2005; 50 pages; 19 figures

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• Testing Properties of the Galactic Center Black Hole Using Stellar Orbits
• Evidence for X-ray synchrotron emission from simultaneous mid-IR to X-ray observations of a strong Sgr A* flare
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• A Chandra/HETGS Census of X-ray Variability From Sgr A* During 2012
• Flaring Activity of Sgr A* at 43 and 22 GHz: Evidence for Expanding Hot Plasma
• A Constant Spectral Index for Sagittarius A* During Infrared/X-ray Intensity Variations
• A Magnetohydrodynamic Model for the Formation of Episodic Jets
• Sgr A* and General Relativity
• A powerful flare from Sgr A* confirms the synchrotron nature of the X-ray emission
• The two states of Sgr A* in the near-infrared: bright episodic flares on top of low-level continuous variability
• The Milky Way's Supermassive Black Hole: How good a case is it? A Challenge for Astrophysics & Philosophy of Science
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• Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements
• Results from an extensive simultaneous broadband campaign on the underluminous active nucleus M81*: further evidence for mass-scaling accretion in black holes
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• Near-infrared polarimetry setting constraints on the orbiting spot model for Sgr A* flares
• Near-infrared proper motions and spectroscopy of infrared excess sources at the Galactic Center
• Fifteen years of XMM-Newton and Chandra monitoring of Sgr A*: Evidence for a recent increase in the bright flaring rate
• Tilted black hole accretion disc models of Sagittarius A*: time-variable millimetre to near-infrared emission
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• An 8 hour characteristic time-scale in submillimetre light curves of Sagittarius A*
• Imaging an Event Horizon: Mitigation of Scattering Toward Sagittarius A*
• General relativistic resistive magnetohydrodynamics with robust primitive variable recovery for accretion disk simulations
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• The mean infrared emission of SagittariusA*
• Galactic Center Research: Manifestations of the Central Black Hole
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• Scalar field effects on the orbit of S2 star
• A 600 minute near-infrared lightcurve of Sagittarius A*
• The X-ray Flux Distribution of Sagittarius A* as Seen by Chandra
• The X-ray flaring properties of Sgr A* during six years of monitoring with Swift
• Evolving Nonthermal Electrons in Simulations of Black Hole Accretion
• The Intrinsic Two-Dimensional Size of Sagittarius A*
• The Properties of Reconnection Current Sheets in GRMHD Simulations of Radiatively Inefficient Accretion Flows
• Multiwavelength VLBI observations of Sagittarius A*
• Polarized light from Sgr A* in the near-infrared $K_s$-band
• The pattern of accretion flow onto Sgr A*
• Sub-milliarcsecond Imaging of SgrA* and M87
• The extreme luminosity states of Sagittarius A*
• Self-consistent spectra from radiative GRMHD simulations of accretion onto Sgr A*
• A Testable the Stochastic Acceleration Model for Flares in Sagittarius A*
• CHIMPS2: Survey description and ${}^{12}$CO emission in the Galactic Centre
• Variations in emission from episodic plasmoid ejecta around black holes
• A Systematic Chandra study of Sgr A${}^{\star }$: I. X-ray flare detection
• Multiwavelength Light Curves of Two Remarkable Sagittarius A* Flares
• Simultaneous H.E.S.S. and Chandra observations of Sagittarius A* during an X-ray flare
• Coordinated NIR/mm observations of flare emission from Sagittarius A*
• A magnetohydrodynamic model for multi-wavelength flares from Sagittarius~A${}^{\star }$ (I): model and the near-infrared and X-ray flares
• Sagittarius A* High Energy X-ray Flare Properties During NuSTAR Monitoring of the Galactic Center from 2012 to 2015
• Gravitational lensing of stars orbiting the Massive Black Hole in the Galactic Center
• A Jet Model for the Broadband Spectrum of the Seyfert-1 Galaxy NGC 4051
• The millimetre variability of M81* -- Multi-epoch dual frequency mm-observations of the nucleus of M81
• Polarization images of accretion flow around supermassive black holes: imprints of toroidal field structure
• The variability of Sagittarius A* at 3 millimeter
• Simultaneous Monitoring of X-ray and Radio Variability in Sagittarius A*
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• A Systematic Chandra study of Sgr A${}^{\star }$: II. X-ray flare statistics
• AzTEC Survey of the Central Molecular Zone: Data Reduction, Analysis, and Preliminary Results
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• Synchrotron Blob Model of Infrared and X-ray Flares from Sagittarius A${}^{\ast }$
• Monitoring the Galactic Centre with Australia Telescope Compact Array
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• Coordinated mm/sub-mm observations of Sagittarius A* in May 2007
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• High Energy Activity of the Super-Massive Black Hole at the Galactic Center
• The Galactic Center Black Hole Laboratory