First Simultaneous NIR/X-ray Detection of a Flare from SgrA*

Abstract

We report on the first simultaneous near-infrared/X-ray detection of the Sgr A* counterpart which is associated with the massive black hole at the center of the Milky Way. 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. We also report on quasi-simultaneous observations at a wavelength of 3.4 mm using the Berkeley-Illinois-Maryland Association (BIMA) array. A flare was detected in the X-domain with an excess 2-8 keV luminosity of about 6$\times 10^{33}$ erg/s. A fading flare of Sgr A* with $>$2 times the interim-quiescent flux was also detected at the beginning of the NIR observations, that overlapped with the fading part of the X-ray flare. Compared to 8-9 hours before the NIR/X-ray flare we detected a marginally significant increase in the millimeter flux density of Sgr A* during measurements about 7-9 hours afterwards. We find that the flaring state can be conveniently explained with a synchrotron self-Compton model involving up-scattered sub-millimeter photons from a compact source component, possibly with modest bulk relativistic motion. The size of that component is assumed to be of the order of a few times the Schwarzschild radius. The overall spectral indices ${\alpha }_{NIR/X-ray}$ ($S_{\nu }$$\propto$${\nu }^{-\alpha }$) of both states are quite comparable with a value of $\sim$1.3. Since the interim-quiescent X-ray emission is spatially extended, the spectral index for the interim-quiescent state is probably only a lower limit for the compact source Sgr A*. A conservative estimate of the upper limit of the time lag between the ends of the NIR and X-ray flare is of the order of 15 minutes.

Reviewed version; minor changes; added quasi-simultaneous submm observations

References in corpus (35)

• On the Fate of Gas Accreting at a Low Rate onto a Black Hole
• Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
• 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
• An Overview of the Performance and Scientific Results from the Chandra X-Ray Observatory (CXO)
• The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
• Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A*
• 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
• The Supermassive Black Hole at the Galactic Center
• The Accelerations of Stars Orbiting the Milky Way's Central Black Hole
• Convection-Dominated Accretion Flows
• Bayesian Blocks, A New Method to Analyze Structure in Photon Counting Data
• Stellar Dynamics in the Galactic centre: Proper Motions and Anisotropy
• Stellar dynamics in the central arcsecond of our galaxy
• A Geometric Determination of the Distance to the Galactic Center
• Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
• Planetary Nebulae as Standard Candles. XII. Connecting the Population I and Population II Distance Scales
• A Jet-ADAF model for Sgr A*
• The Nature of the 10 Kilosecond X-ray Flare in Sgr A*
• The Proper Motion of SgrA*: I. First VLBA Results
• XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
• Stellar Orbits Near Sagittarius A*
• On The Nature of the Variable Infrared Emission from Sgr A*
• X-ray flares reveal mass and angular momentum of the Galactic Center black hole
• Variability of Sagittarius A* - Flares at 1 Millimeter
• Chandra Multi-wavelength Project (ChaMP). I. First X-ray Source Catalog
• A New X-Ray Flare from the Galactic Nucleus Detected with the XMM-Newton Photon Imaging Cameras
• The Magnetohydrodynamics of Convection-Dominated Accretion Flows
• X-ray flares from Sgr A*: star-disk interactions?
• Spectral Models of Convection-Dominated Accretion Flows
• Measuring the Black Hole Spin in Sgr A*
• A Radio Outburst Nearly Coincident with the Large X-ray Flare from Sgr A* on 2002-10-03
• Close stars and an inactive accretion disk in Sgr A*: Eclipses and flares
• On angular momentum transport in convection-dominated accretion flows

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