Program: GN-2014A-Q-71
Title: | Determining the orgin and structure of the young stellar disk at the Galactic center with NIFS |
PI: | Tuan Do |
Co-I(s): | Jessica Lu, Sylvana Yelda, Andrea Ghez, Norman Murray, Morten Stostad, Leo Meyer |
Abstract
The existence of a kinematically distinct disk of young stars in the center of the Milky Way has long been a puzzle, as the strong tidal field from the supermassive black hole should inhibit the collapse of molecular clouds. The solution to this puzzle will offer insight onto star formation in extreme environments. Two solutions have been offered: in-situ star formation in a massive gaseous accretion disk around Sgr A*, or the young stars were brought in by an infalling cluster. Despite many observations in the past decade, neither of these scenarios are clearly favored by data. We propose a new approach to differentiate between these two scenarios by searching for an edge to the young stellar disk. In-situ formation should show an edge where the gas disk truncates, but an infalling cluster should leave a trail of stars. A previous NIFS program from our group to map the disk plane has shown some evidence for such an edge. We propose to obtain LGS AO NIFS observations to sample additional azimuthal and radial locations to determine whether an edge exists, or whether the previous NIFS program missed young stars because the disk is highly warped as some observations have claimed. This program will also map the kinematics of the young stars to infer the initial conditions for their formation.
Publications using this program's data
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[data]
[ADS] Mapping the Outer Edge of the Young Stellar Cluster in the Galactic Center
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[data]
[ADS] Discovery of Low-metallicity Stars in the Central Parsec of the Milky Way
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[data]
[ADS] New temperature and metallicity scale of cool giants from K-band spectra
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[data]
[ADS] Measuring the α-abundance of Subsolar-metallicity Stars in the Milky Way's Central Half-parsec: Testing Globular Cluster and Dwarf Galaxy Infall Scenarios
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[data]
[ADS] The Star Formation History of the Milky Way's Nuclear Star Cluster