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• W3100820586 abstract "Context. The Galactic centre hosts a crowded, dense nuclear star cluster with a half-light radius of 4 pc. Most of the stars in the Galactic centre are cool late-type stars, but there are also >100 hot early-type stars in the central parsec of the Milky Way. These stars are only 3−8 Myr old. Aims. Our knowledge of the number and distribution of early-type stars in the Galactic centre is incomplete. Only a few spectroscopic observations have been made beyond a projected distance of 0.5 pc of the Galactic centre. The distribution and kinematics of earlytype stars are essential to understand the formation and growth of the nuclear star cluster. Methods. We cover the central > 4p c 2 (0.75 sq. arcmin) of the Galactic centre using the integral-field spectrograph KMOS (VLT). We extracted more than 1000 spectra from individual stars and identified early-type stars based on their spectra. Results. Our data set contains 114 bright early-type stars: 6 have narrow emission lines, 23 are Wolf-Rayet stars, 9 stars have featureless spectra, and 76 are O/B type stars. Our wide-field spectroscopic data confirm that the distribution of young stars is compact, with 90% of the young stars identified within 0.5 pc of the nucleus. We identify 24 new O/B stars primarily at large radii. We estimate photometric masses of the O/B stars and show that the total mass in the young population is >12 000 M� .T he O/B stars all appear to be bound to the Milky Way nuclear star cluster, while less than 30% belong to the clockwise rotating disk. We add one new star to the sample of stars affiliated with this disk. Conclusions. The central concentration of the early-type stars is a strong argument that they have formed in situ. An alternative scenario, in which the stars formed outside the Galactic centre in a cluster that migrated to the centre, is refuted. A large part of the young O/B stars is not on the disk, which either means that the early-type stars did not all form on the same disk or that the disk is dissolving rapidly." @default.
• W3100820586 created "2020-11-23" @default.
• W3100820586 creator A5015129175 @default.
• W3100820586 creator A5031687927 @default.
• W3100820586 creator A5033864066 @default.
• W3100820586 creator A5042996647 @default.
• W3100820586 creator A5043620022 @default.
• W3100820586 creator A5055579397 @default.
• W3100820586 creator A5062840259 @default.
• W3100820586 creator A5063282911 @default.
• W3100820586 creator A5078233989 @default.
• W3100820586 creator A5078881473 @default.
• W3100820586 date "2015-12-01" @default.
• W3100820586 modified "2023-09-27" @default.
• W3100820586 title "KMOS view of the Galactic centre - I. Young stars are centrally concentrated" @default.
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