Monitoring dusty sources in the vicinity of Sgr A*
  We trace several dusty infrared sources on their orbit around the
supermassive black hole (SMBH) SgrA* in the center of our galaxy. We give an
overview of known and unknown sources in the direct vicinity of our SMBH in a
radius of around 0.04pc. For that, we are using NACO (K- and L'-band) and
SINFONI (H+K-band) data (VLT, Chile/Paranal) between 2002 and 2018. Our
spectroscopic analysis reveals a Doppler-shifted line emission of Br_gamma and
HeI. Additionally, we report the detection of [FeIII] lines that are found
exclusively in the investigated dusty sources west of SgrA*. We speculate, that
the known [FeIII] emission in the GC is partially generated due to the line
emission of the Dusty sources investigated in this work. However, we extend our
analysis of the GC by taking the bright Br_gamma-bar close (< 120 mas) to SgrA*
into account. The finding of this feature is in line with a reported SgrA*
X-ray bubble that consists of an open side towards G359.945-0.044
(North-West-West direction). The location of the open side of this X-ray bubble
coincides with the emission of the bright Br_gamma-bar detected in our SINFONI
data-cubes.
