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• W1859172354 endingPage "106" @default.
• W1859172354 startingPage "106" @default.
• W1859172354 abstract "We present new near-infrared spectroscopic observations of the outer edges of the young stellar cluster around the supermassive black hole at the Galactic center. The observations show a break in the surface-density profile of young stars at approximately 13 arcsec (0.52 pc). These observations spectroscopically confirm previous suggestions of a break based on photometry. Using Gemini North's Near-Infrared Integral Field Spectrometer (NIFS) we are able to detect and separate early- and late-type stars with a 75% completeness at Ks = 15.5. We sample a region with radii between 7 to 23 (0.28 pc to 0.92 pc) from Sgr A*, and present new spectral classifications of 144 stars brighter than Ks = 15.5, where 140 stars are late-type (> 1 Gyr) and only four stars are early-type (young, 4-6 Myr). A broken power-law fit of the early-type surface-density matches well with our data and previously published values. The projected surface-density of late-type stars is also measured and found to be consistent with previous results. We find that the observed early-type surface-density profile is inconsistent with the theory of the young stars originating from a tightly bound infalling cluster, as no significant trail of young stars is found at radii above 13. We also note that either a simple disk instability criterion or a cloud-cloud collision could explain the location of the outer edge, though we lack information to make conclusive remarks on either alternative. If this break in surface-density represents an edge to the young stellar cluster it would set an important scale for the most recent episode of star formation at the Galactic center." @default.
• W1859172354 created "2016-06-24" @default.
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• W1859172354 date "2015-07-24" @default.
• W1859172354 modified "2023-10-01" @default.
• W1859172354 title "MAPPING THE OUTER EDGE OF THE YOUNG STELLAR CLUSTER IN THE GALACTIC CENTER" @default.
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• W1859172354 doi "https://doi.org/10.1088/0004-637x/808/2/106" @default.
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