Other
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999gcnew..10....4e&link_type=abstract
GCNEWS - Galactic Center Newsletter, vol. 10, p. 4-6 (eds. A. Cotera & H. Falcke)
Other
Galactic Center, Stellar Population, Vlt, Black Hole, Spectroscopy
Scientific paper
We have obtained new near-infrared observations of the central stellar cluster of our Galaxy carried out with the infrared spectrometer ISAAC at the ESO VLT and the MPE speckle camera SHARP at the ESO NTT. With ISAAC we used a spectral resolution of lambda/Delta lambda ~ 3500 on the 2.058 micron He I, 2.165 micron Br-gamma emission lines, and 2.29 micron CO bandhead absorption line. The data demonstrate clearly that there is no strong CO bandhead absorption originating in the northern part (S1/S2 area) of the central stellar cluster at the position of Sgr A*. This makes it likely that the K ~ 14.5 fast moving objects are O9 - B0.5 stars with masses of 15 to 20 Msun. Weak CO bandhead absorption in the southern part of the cluster (S10/S11 area) could be due to contributions from neighbouring stars. We have also detected Br-gamma and He I line emission at the position of the central stellar cluster which could be associated with the 'mini-spiral' rather than with the Sgr A* cluster itself. At the NTT we obtained another epoch to measure the proper motion structure and variability of sources in the central stellar cluster (see Ott, Eckart, Genzel 1999). The changes of source positions are consistent with the proper motion velocities derived from earlier epochs.
Eckart Andreas
Genzel Reinhard
Ott Th.
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