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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2005

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

Résumé

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*.

Dates et versions

hal-03785223 , version 1 (23-09-2022)

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Yann Clénet, Daniel Rouan, Damien Gratadour, Olivier Marco, Pierre Léna, et al.. A dual emission mechanism in Sgr A*/L'?. Astronomy and Astrophysics - A&A, 2005, 439, pp.L9-L13. ⟨10.1051/0004-6361:200500146⟩. ⟨hal-03785223⟩
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