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From: Lida Oskinova  lida@astro.physik.uni-potsdam.de 
To: gcnews@aoc.nrao.edu
Subject: submit xrayclusters.tex JENAM 2005 conf.proc.


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\title{\bf X-raying the super star clusters in the Galactic center}
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\author{L.~M.~Oskinova}
\affil{Astrophysik, Universit{\"a}t Potsdam, Germany}
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``Massive Stars and High-Energy Emission in OB Associations'';
JENAM 2005 'Distant Worlds' \quad\bull}%
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\begin{abstract} 

The Galactic center harbors some of the most massive star clusters known
in  the Galaxy: the Arches and the Quintuplet. Based on the Chandra 
observations of these clusters (PI: Wang) which recently became public,  
I discuss the X-ray emission from the massive stars in these clusters.
Confirming  the general trend for  Wolf-Rayet (WR) stars being X-ray dim, 
none of them is detected in the Quintuplet cluster. The most massive 
star known in the Galaxy, the Pistol star, is also  not  detected,
invoking 
questions regarding the proposed binary nature of this  object. X-ray
emission 
in the Arches cluster is dominated by three stellar point sources. All
three 
sources as well as the cluster's diffuse radiation show strong  
emission at 6.4--6.7\,keV,  indicating the presence of fluorescenting cool 
material. The Arches point sources may be identified as colliding wind
binaries, 
albeit other possibilities cannot be  ruled out. } 
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\end{abstract}
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