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High spatial resolution observations in the 1 to 3.5 micron region of theGalactic Center source known historically as IRS 13 are presented. They includeground-based adaptive optics images in the H, Kp (2.12/0.4 micron) and L bands,NICMOS data in filters between 1.1 and 2.2 micron, and integral fieldspectroscopic data from BEAR, an Imaging FTS, in the HeI 2.06 micron and theBr$\gamma$ line regions. Analysis of all these data provides a completely newpicture of the main component, IRS 13E, which appears as a cluster of sevenindividual stars within a projected diameter of ~0.5'' (0.02 pc). The brightestsources, 13E1, 13E2, 13E3 (a binary), and 13E4, are all massive stars, 13E1 ablue object, with no detected emission line while 13E2 and 13E4 are high-massemission line stars. 13E2 is at the WR stage and 13E4 a massive O-type star.13E3A and B are extremely red objects, proposed as other examples of dusty WRstars. All these sources have a common westward proper motion. 13E5, is a redsource similar to 13E3A/B. This concentration of comoving massive hot stars,IRS 13E, is proposed as the remaining core of a massive star cluster, whichcould harbor an intermediate-mass black hole (IMBH) of ~1300 M_sol. Thisdetection plays in favor of a scenario in which the helium stars and the otherhot stars in the central pc originate from the stripping of a massive clusterformed several tens of pc from the center. The detection of a discrete X-rayemission (Baganoff et al. 2003) at the IRS~13 position is examined in thiscontext.Comment: 14 pages, 6 figures (3 in color), LaTeX2e, accepted in A&

The nature of the Galactic Center source IRS 13 revealed by high spatial resolution in the infrared