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| Paper: |
First Spectroscopic Identification of Massive Young Stellar Objects in the Galactic Center |
| Volume: |
439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies |
| Page: |
115 |
| Authors: |
An, D.; Ramírez, S. V.; Sellgren, K.; Arendt, R. G.; Adwin Boogert, A. C.; Schultheis, M.; Stolovy, S. R.; Cotera, A. S.; Robitaille, T. P.; Smith, H. A. |
| Abstract: |
We report the detection of several molecular gas-phase and ice absorption features
in three photometrically-selected young stellar object (YSO) candidates in the central
280 pc of the Milky Way. Our spectra, obtained with the Infrared Spectrograph (IRS)
onboard the Spitzer Space Telescope, reveal gas-phase absorption from CO2
(15.0 μm), C2H2 (13.7 μm) and HCN (14.0 μm). We attribute this absorption
to warm, dense gas in massive YSOs. We also detect strong and broad 15 μm CO2
ice absorption features, with a remarkable double-peaked structure. The prominent
long-wavelength peak is due to CH3OH-rich ice grains, and is similar to those found
in other known massive YSOs. Our IRS observations demonstrate the youth of these objects,
and provide the first spectroscopic identification of massive YSOs in the Galactic Center. |
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