NOAO >   Observing Info >   Approved Programs >   2014A-0132

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Proposal Information for 2014A-0132


PI: Kris Sellgren, Ohio State University, sellgren@astronomy.ohio-state.edu
Address: Department of Astronomy, 174 W. 18th Avenue, Columbus, OH 43210-1106, USA

CoI: Deokkeun An, Ewha W. University
CoI: Adwin Boogert, Caltech IPAC
CoI: Solange Ramirez, Caltech IPAC

Title: Characterization of Methanol Ice around Massive YSOs in the Galactic Center

Abstract: We propose to obtain moderate-resolution L-band spectra of one of the newly discovered massive young stellar objects (YSOs) in the Galactic center (GC). These YSOs exhibit a characteristic shape of CO2 ice absorption band at 15 um- 15.6 um in our Spitzer/IRS, where the "shoulder" CO2 ice component centered at 15.4 um makes the band particularly broad. The shoulder ice absorption is ascribed to CO2 ice grains mixed with a large amount of CH3OH, and has only been found in previously known massive YSOs in the Galactic disk. However, it is not known well how star formation proceeds in the hostile GC molecular clouds, and whether the same chemical networks are in operation as in the normal star-forming regions in the disk to produce the observed shape of the 15 um CO2 absorption. To confirm this hypothesis, we will use the Subaru/IRCS to obtain high signal-to-noise L-band spectra, aiming to detect 3.535 um ice band, which is solely produced by CH3OH ice grains, and will measure the CH3OH ice column density in the GC. If confirmed, this would not only be the first detection of the solid CH3OH of GC YSOs, but also provide an important clue on the astrochemical process in the nuclear star-forming regions of large spiral galaxies.


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NOAO >   Observing Info >   Approved Programs >   2014A-0132

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