Near infrared flares of Sagittarius A*: Importance of near infrared polarimetry

Abstract

We report on the results of new simulations of near-infrared (NIR) observations of the Sagittarius A* (Sgr A*) counterpart associated with the super-massive black hole at the Galactic Center. The observations have been carried out using the NACO adaptive optics (AO) instrument at the European Southern Observatory's Very Large Telescope and CIAO NIR camera on the Subaru telescope (13 June 2004, 30 July 2005, 1 June 2006, 15 May 2007, 17 May 2007 and 28 May 2008). We used a model of synchrotron emission from relativistic electrons in the inner parts of an accretion disk. The relativistic simulations have been carried out using the Karas-Yaqoob (KY) ray-tracing code. We probe the existence of a correlation between the modulations of the observed flux density light curves and changes in polarimetric data. Furthermore, we confirm that the same correlation is also predicted by the hot spot model. Correlations between intensity and polarimetric parameters of the observed light curves as well as a comparison of predicted and observed light curve features through a pattern recognition algorithm result in the detection of a signature of orbiting matter under the influence of strong gravity. This pattern is detected statistically significant against randomly polarized red noise. Expected results from future observations of VLT interferometry like GRAVITY experiment are also discussed.

26 pages, 38 figures, accepted for publication by A&A

References in corpus (62)

• Monitoring stellar orbits around the Massive Black Hole in the Galactic Center
• On characterising the variability properties of X-ray light curves from active galaxies
• Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
• Stellar Orbits Around the Galactic Center Black Hole
• Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
• SINFONI in the Galactic Center: young stars and IR flares in the central light month
• Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
• The Accelerations of Stars Orbiting the Milky Way's Central Black Hole
• A Geometric Determination of the Distance to the Galactic Center
• A Jet-ADAF model for Sgr A*
• The structure of the nuclear stellar cluster of the Milky Way
• An extended scheme for fitting X-ray data with accretion disk spectra in the strong gravity regime
• Imaging Optically-Thin Hot Spots Near the Black Hole Horizon of Sgr A* at Radio and Near-Infrared Wavelengths
• The Nature of the 10 Kilosecond X-ray Flare in Sgr A*
• An X-ray, IR, and Submillimeter Flare of Sagittarius A*
• XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
• Polarimetry of near-infrared flares from Sagittarius A*
• Magnetically Driven Accretion Flows in the Kerr Metric II: Structure of the Magnetic Field
• On The Nature of the Variable Infrared Emission from Sgr A*
• Stellar Orbits Near Sagittarius A*
• First Simultaneous NIR/X-ray Detection of a Flare from SgrA*
• A Numerical Method for General Relativistic Magnetohydrodynamics
• Flaring Activity of Sgr A* at 43 and 22 GHz: Evidence for Expanding Hot Plasma
• Methods for detecting flaring structures in Sagittarius A* with high frequency VLBI
• A Multi-Wavelength Study of Sgr A*: The Role of Near-IR Flares in Production of X-ray, Soft $\gamma$-ray and Sub-millimeter Emission
• Where is the Inner Edge of an Accretion Disk Around a Black Hole?
• A near-IR variability study of the Galactic black hole: a red noise source with no detected periodicity
• A Constant Spectral Index for Sagittarius A* During Infrared/X-ray Intensity Variations
• Frequency-Dependent Shift in the Image Centroid of the Black Hole at the Galactic Center as a Test of General Relativity
• The First Laser Guide Star Adaptive Optics Observations of the Galactic Center: Sgr A*'s Infrared Color and the Extended Red Emission in its Vicinity
• Vortices In Circumstellar Disks
• Simultaneous Chandra, CSO and VLA Observations of Sgr A*: The Nature of Flaring Activity
• Thermal disc emission from a rotating black hole: X-ray polarization signatures
• The variability of accretion onto Schwarzschild black holes from turbulent magnetized discs
• Polarimetric Imaging of the Massive Black Hole at the Galactic Center
• An Accretion-Induced X-ray Flare in Sgr A*
• Near-infrared polarimetry setting constraints on the orbiting spot model for Sgr A* flares
• Light Curves from an MHD Simulation of a Black Hole Accretion Disk
• Tidal effects on small bodies by massive black holes
• Prospects for testing the nature of Sgr A*'s NIR flares on the basis of current VLT- and future VLTI-observations
• Polarized NIR and X-ray Flares from SgrA*
• A Possible Rossby Wave Instability Origin for the Flares in Sagittarius A*
• K-band polarimetry of an Sgr A* flare with a clear sub-flare structure
• Simultaneous NIR/sub-mm observation of flare emission from SgrA*
• First proper motions of thin dust filaments at the Galactic Center
• Stochastic Electron Acceleration During the NIR and X-ray Flares in Sagittarius A*
• X-ray flares from Sgr A*: star-disk interactions?
• MHD Simulations of Accretion onto Sgr A*: Quiescent Fluctuations, Outbursts, and Quasi-Periodicity
• On the orientation of the Sagittarius A* system
• Modeling mm- to X-ray flare emission from SgrA*
• General Relativistic Flux Modulations from Disk Instabilities in Sagittarius A*
• Measuring the Black Hole Spin in Sgr A*
• Hot-spot model for accretion disc variability as random process
• The Variability of Polarized Radiation from Sgr A*
• Black Holes and Relativistic Jets
• Limits on the Position Wander of Sgr A*
• Variation in the primary and reprocessed radiation from an orbiting spot around a black hole
• Near-infrared Polarimetry of flares from Sgr A* with Subaru/CIAO
• An evolving hot spot orbiting around Sgr A*
• Oscillations of the Inner Regions of Viscous Accretion Disks
• Modulated X-ray Emissivity near the Stress Edge in Sgr A*
• QPOs from Random X-ray Bursts around Rotating Black Holes

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• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• Detection of orbital motions near the last stable circular orbit of the massive black hole SgrA*
• The Submillimeter Bump in Sgr A* from Relativistic MHD Simulations
• Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius A*
• GYOTO: a new general relativistic ray-tracing code
• On the charge of the Galactic centre black hole
• The Milky Way's Supermassive Black Hole: How good a case is it? A Challenge for Astrophysics & Philosophy of Science
• Modeling the orbital motion of Sgr A*'s near-infrared flares
• Variability Timescale and Spectral Index of Sgr A* in the Near Infrared: Approximate Bayesian Computation Analysis of the Variability of the Closest Supermassive Black Hole
• Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements
• Orbital motion near Sagittarius A* -- Constraints from polarimetric ALMA observations
• Polarimetry and Astrometry of NIR Flares as Event Horizon Scale, Dynamical Probes for the Mass of Sgr A*
• The Polarized Image of a Synchrotron Emitting Ring of Gas Orbiting a Black Hole
• Polarized Image of Equatorial Emission in the Kerr Geometry
• Galactic Center Research: Manifestations of the Central Black Hole
• Fast Variability and mm/IR flares in GRMHD Models of Sgr A* from Strong-Field Gravitational Lensing
• Dynamically important magnetic fields near the event horizon of Sgr A*
• Dynamical Imaging with Interferometry
• Constraining the charge of the Galactic centre black hole
• Multiwavelength VLBI observations of Sagittarius A*
• The instrumental polarization of the Nasmyth focus polarimetric differential imager NAOS/CONICA (NACO) at the VLT - Implications for time-resolved polarimetric measurements of Sgr A*
• Polarized light from Sgr A* in the near-infrared $K_s$-band
• Effect of Electromagnetic Interaction on Galactic Center Flare Components
• The extreme luminosity states of Sagittarius A*
• Adaptive Analytical Ray Tracing of Black Hole Photon Rings
• Spacetime Tomography Using The Event Horizon Telescope
• The optical variability of Supermassive Black Hole Binary Candidate PG1302-102: Periodicity and perturbation in the light curve
• Polarimetric signatures of hot spots in black hole accretion flows
• Bright X-ray flares from Sgr A*
• Deep Images of the Galactic Center with GRAVITY
• Coordinated NIR/mm observations of flare emission from Sagittarius A*
• Wisps in the Galactic center: NIR triggered observations of the radio source Sgr A* at 43 GHz
• A magnetized torus for modeling Sgr A* millimeter images and spectra
• Relative Astrometry of Compact Flaring Structures in Sgr A* with Polarimetric VLBI
• The 492 GHz emission of Sgr A* constrained by ALMA
• Near-infrared polarimetry as a tool for testing properties of accreting super-massive black holes
• Flares and variability from Sagittarius A*: five nights of simultaneous multi-wavelength observations
• Studies of the Origin of High-Frequency Quasi-Periodic Oscillations of Mass Accreting Black Holes in X-ray Binaries with Next-Generation X-ray Telescopes
• Monitoring the Galactic Centre with Australia Telescope Compact Array
• Adaptive optics assisted near-infrared polarization measurements of sources in the Galactic Center
• Forward Ray Tracing and Hot Spots in Kerr Spacetime
• Electromagnetic signatures of strong-field gravity from accreting black holes
• Flare emission from Sagittarius A*
• Observational signatures from higher-order images of moving hotspots in accretion disks
• Time Lag in Intra-Day Variability of Sgr A* between the Light Curves at 90 and 102GHz
• The orbit and nature of the semi-detached stellar companion of Sgr A* super-massive blackhole
• The Galactic Center Black Hole Laboratory
• Auto- and cross-correlations for multiple images of corotating hotspots in accretion disks
• Polarization Signatures of Inspiraling Hotspots around Kerr Black Holes