A dual emission mechanism in Sgr A*/L' ?

Abstract

We have collected in 2004 adaptive optics corrected L' images of the Galactic Center region with NAOS-CONICA at VLT. A strong variability was observed as well as a correlation between the photocenter positions and fluxes of the L'-band counterpart of Sgr A*. It is interpreted as the combined emission of a point-like flaring source at the position of Sgr A*/IR itself and an extended dust structure, 75 mas south west of Sgr A*/IR, which we name Sgr A*-f. We examine the different possible mechanisms to explain this dual Sgr A* L' emission and conclude it is likely a flaring emission associated to energetic events in the close environment of the black hole plus a quiescent emission resulting from the collision of Sgr A*-f by a jet from Sgr A*.

accepted in A&A

References in corpus (9)

• 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
• 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
• XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
• On The Nature of the Variable Infrared Emission from Sgr A*
• First Simultaneous NIR/X-ray Detection of a Flare from SgrA*
• The infrared L'-band view of the Galactic Center with NAOS-CONICA at VLT
• Detection of the Sgr A* activity at 3.8 and 4.8 microns with NACO

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