L- and K-band continuum of the GC in 2006. The approximate position of Sgr A* is indicated by a green x. Above the SMBH, the bright B2V S-star S2 can be found. The D-complex is indicated by a golden rectangle box. At the position of D2 in 2006, the S-star S43 located. However, the L-band flux of S43 is low compared to D2 (flux D2/S43 ∼ 2/1). The detected emission in this NACO image is therefore dominated by D2 in 2006. Because of the chosen contrast, D3 and D3.1 appear to be confused. Right image: same FOV in the K-band continuum. Even though this image is from 2004, the D-sources are visible at roughly the same position as in the 2006 L′-band image (left). Since their magnitudes are close to the detection limit, we use a high- and a low-pass filter to identify a K-band counterpart of the dusty sources. The inlet in the right image shows a 3 px smooth-subtracted detection of these objects.
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