Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements

Abstract

We present a comprehensive data description for Ks-band measurements of Sgr A*. We characterize the statistical properties of the variability of Sgr A* in the near-infrared, which we find to be consistent with a single-state process forming a power-law distribution of the flux density. We discover a linear rms-flux relation for the flux-density range up to 12 mJy on a timescale of 24 minutes. This and the power-law flux density distribution implies a phenomenological, formally non-linear statistical variability model with which we can simulate the observed variability and extrapolate its behavior to higher flux levels and longer timescales. We present reasons why data with our cadence cannot be used to decide on the question whether the power spectral density of the underlying random process shows more structure at timescales between 25 min and 100 min compared to what is expected from a red noise random process.

arXiv commentAccepted to ApJS, August 27, 2012

References in corpus (68)

• Monitoring stellar orbits around the Massive Black Hole in the Galactic Center
• Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• 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
• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• Stellar Orbits Around the Galactic Center Black Hole
• Chandra X-ray Spectroscopic Imaging of Sgr A* and the Central Parsec of the Galaxy
• High Proper Motion Stars in the Vicinity of Sgr A*: Evidence for a Supermassive Black Hole at the Center of Our Galaxy
• Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
• Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
• Non-linear X-ray variability in X-ray binaries and active galaxies
• The Accelerations of Stars Orbiting the Milky Way's Central Black Hole
• Measuring the broadband power spectra of active galactic nuclei with RXTE
• Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare?
• A Geometric Determination of the Distance to the Galactic Center
• The flux-dependent amplitude of broadband noise variability in X-ray binaries and active galaxies
• A gas cloud on its way towards the super-massive black hole in the Galactic Centre
• Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
• An extended scheme for fitting X-ray data with accretion disk spectra in the strong gravity regime
• X-ray variability of 104 active galactic nuclei. XMM-Newton power-spectrum density profiles
• XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
• Interferometric Measurements of Variable 340 GHz Linear Polarization in Sagittarius A*
• Evidence for X-ray synchrotron emission from simultaneous mid-IR to X-ray observations of a strong Sgr A* flare
• Polarimetry of near-infrared flares from Sagittarius A*
• 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*
• Flaring Activity of Sgr A* at 43 and 22 GHz: Evidence for Expanding Hot Plasma
• 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
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• Hard X-ray view of the past activity of Sgr A* in a natural Compton mirror
• 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
• Fading hard X-ray emission from the Galactic Centre molecular cloud Sgr B2
• X-ray hiccups from SgrA* observed by XMM-Newton. The second brightest flare and three moderate flares caught in half a day
• The two states of Sgr A* in the near-infrared: bright episodic flares on top of low-level continuous variability
• 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
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• The Flare Activity of SgrA*; New Coordinated mm to X-Ray Observations
• StarFinder: an IDL GUI based code to analyze crowded fields with isoplanatic correcting PSF fitting
• Simultaneous Chandra, CSO and VLA Observations of Sgr A*: The Nature of Flaring Activity
• Simultaneous Multi-Wavelength Observations of Sgr A* during 2007 April 1-11
• Near-infrared polarimetry setting constraints on the orbiting spot model for Sgr A* flares
• Swift J1644+57: A White Dwarf Tidally Disrupted by a 10^4 M_{odot} Black Hole?
• Afterglow Model for the Radio Emission from the Jetted Tidal Disruption Candidate Swift J1644+57
• Polarized NIR and X-ray Flares from SgrA*
• K-band polarimetry of an Sgr A* flare with a clear sub-flare structure
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• The mean infrared emission of SagittariusA*
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• A 600 minute near-infrared lightcurve of Sagittarius A*
• On the orientation of the Sagittarius A* system
• 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*
• A power-law break in the near-infrared power spectrum of the Galactic center black hole
• The extreme luminosity states of Sagittarius A*
• A Testable the Stochastic Acceleration Model for Flares in Sagittarius A*
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• An evolving hot spot orbiting around Sgr A*
• Coordinated multi-wavelength observations of Sgr A*
• Captures of stars by a massive black hole: Investigations in numerical stellar dynamics

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