Details

Autor(en) / Beteiligte

• Clénet, Y.
• Rouan, D.
• Gratadour, D.
• Marco, O.
• Léna, P.
• Ageorges, N.
• Gendron, E.

Titel

A dual emission mechanism in Sgr A/L′?

Ist Teil von

• Astronomy and astrophysics (Berlin), 2005-08, Vol.439 (2), p.L9-L13

Ort / Verlag

Les Ulis: EDP Sciences

Erscheinungsjahr

2005

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• 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*.