Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-16
Astronomy and Astrophysics
Astrophysics
18 pages, 10 figures, Accepted to ApJ: 15 July 2007
Scientific paper
10.1086/521669
We classify 329 late-type giants within 1 parsec of Sgr A*, using the adaptive optics integral field spectrometer SINFONI on the VLT. These observations represent the deepest spectroscopic data set so far obtained for the Galactic Center, reaching a 50% completeness threshold at the approximate magnitude of the helium-burning red clump (Ks ~ 15.5 mag.). Combining our spectroscopic results with NaCo H and Ks photometry, we construct an observed Hertzsprung-Russell diagram, which we quantitatively compare to theoretical distributions of various star formation histories of the inner Galaxy, using a chi-squared analysis. Our best-fit model corresponds to continuous star formation over the last 12 Gyr with a top-heavy initial mass function (IMF). The similarity of this IMF to the IMF observed for the most recent epoch of star formation is intriguing and perhaps suggests a connection between recent star formation and the stars formed throughout the history of the Galactic Center.
Abuter Robert
Alexander Tal
Eisenhauer Frank
Genzel Reinhard
Gillessen Stefan
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