Discovery of Massive Young Stellar Objects in the Galactic Center with Warm CO2 Gas Absorption

Details Discovery of Massive Young Stellar Objects in the Galactic Center with Warm CO2 Gas Absorption Discovery of Massive Young Stellar Objects in the Galactic Center with Warm CO2 Gas Absorption

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431506a&link_type=abstract

American Astronomical Society, AAS Meeting #214, #315.06; Bulletin of the American Astronomical Society, Vol. 41, p.761

Astronomy and Astrophysics

Astronomy

Scientific paper

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 Galaxy. 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 the massive YSOs. We also detect strong and broad 15.2 µm CO2 ice absorption features, with a double-peaked absorption profile, indicating the presence of thermally processed CO2 ice. 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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