------------------------------------------------------------------------
 clenet.tex A&A, 2005, 439, L9
Date: Mon, 12 Sep 2005 15:33:13 +0200
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%astro-ph/0507088
\documentclass[twocolumn]{aa}
\usepackage{graphicx,natbib,textcomp}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{txfonts}
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%
\begin{document}
%
    \title{A dual emission mechanism in \object{Sgr A*/L$^\prime$} 
?\thanks{Based on observations collected at the ESO VLT Yepun 
telescope, proposal 073.B-0665}}

    \author{Y. Cl\'enet\inst{1}
           \and
           D. Rouan\inst{1}
           \and
           D. Gratadour\inst{1}
           \and
           O. Marco\inst{2}
           \and
           P. L\'ena\inst{1}
           \and
           N. Ageorges\inst{2}
           \and
           E. Gendron\inst{1}
           }

    \offprints{Y. Cl\'enet}

    \institute{ Observatoire de Paris, LESIA, 5 place Jules Janssen, 
F-92195 Meudon Cedex, France\\
               \email{firstname.lastname@obspm.fr}
          \and
              European Southern Observatory (ESO), Alonso de Cordova 
3107, Vitacura, Casilla 19001, Santiago 19, Chile\\
              \email{nageorges@eso.org, omarco@eso.org}
              }

    \date{Received 28 April 2005 / Accepted 26 June 2005}


    \abstract{We have collected in 2004 adaptive optics corrected 
L$^\prime$ 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$^\prime$-band counterpart 
of \object{Sgr~A*}. It is interpreted as the combined emission of a 
point-like flaring source at the position of \object{Sgr~A*/IR} itself 
and an extended dust structure, 75 mas south west of 
\object{Sgr~A*/IR}, which we name \object{Sgr~A*-f}. We examine the 
different possible mechanisms to explain this dual \object{Sgr~A*} 
L$^\prime$ 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 
\object{Sgr~A*-f} by a jet from \object{Sgr~A*}.

    \keywords{Galaxy: center -- Infrared: stars -- Instrumentation : 
adaptive optics}
    }

    \maketitle
\end{document}