An extremely top-heavy initial mass function in the galactic center stellar disks

H Bartko, F Martins, S Trippe, T Fritz, Reinhard Genzel, T Ott, F Eisenhauer, Stefan Gillessen, T Paumard, T Alexander, K Dodd-Eden, O Gerhard, Yuri Levin, L Mascetti, S Nayakshin, H B Perets, G Perrin, Oliver Pfuhl, M Reid, D RouanM Zilka, A Sternberg

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We present new observations of the nuclear star cluster in the central parsec of the Galaxy with the adaptive optics assisted, integral field spectrograph SINFONI on the ESO/VLT. Our work allows the spectroscopic detection of early- and late-type stars to mK a?Y 16, more than 2 mag deeper than our previous data sets. Our observations result in a total sample of 177 bona fide early-type stars. We find that most of these Wolf Rayet (WR), O-, and B-stars reside in two strongly warped disks between 08 and 12a?? from Sgr A*, as well as a central compact concentration (the S-star cluster) centered on Sgr A*.
Original languageEnglish
Pages (from-to)834 - 840
Number of pages7
JournalThe Astrophysical Journal
Issue number1
Publication statusPublished - 2010
Externally publishedYes

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