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First Spectroscopic Identification of Massive Young Stellar Objects in the Galactic Center

An, Deokkeun and Ramirez, Solange V. and Sellgren, Kris and Arendt, Richard G. and Boogert, A. C. Adwin and Schultheis, Mathias and Stolovy, Susan R. and Cotera, Angela S. and Robitaille, Thomas P. and Smith, Howard A. (2011) First Spectroscopic Identification of Massive Young Stellar Objects in the Galactic Center. In: The Galactic Center: A Window to the Nuclear Environment of Disk Galaxies. ASP Conference Series. No.439. Astronomical Society of the Pacific , San Francisco, CA, pp. 115-118. ISBN 978-1-58381-758-2.

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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 CO_2 (15.0 μm), C_2H_2 (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 CO_2 ice absorption features, with a remarkable double- peaked structure. The prominent long-wavelength peak is due to CH_3OH-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.

Item Type:Book Section
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Arendt, Richard G.0000-0001-8403-8548
Robitaille, Thomas P.0000-0002-8642-1329
Additional Information:© 2011 Astronomical Society of the Pacific. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.
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Series Name:ASP Conference Series
Issue or Number:439
Record Number:CaltechAUTHORS:20110726-145918961
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24558
Deposited By: Tony Diaz
Deposited On:27 Jul 2011 19:55
Last Modified:02 Nov 2019 20:17

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