Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.339s&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations of ices around extragalactic YSOs have been attracting a lot of attention recently. It is highly probable that different galactic environments (e.g., metallicity, radiation field, etc.) could affect the chemical properties of circumstellar material. Thus observations of extragalactic YSOs are very interesting if we are to understand the diversity of star-forming materials in the universe. The Large and Small Magellanic Clouds (LMC and SMC) are the nearest metal-poor galaxies to our Galaxy. Observations of YSOs in the MCs have the following two advantages for the study of ice chemistry around YSOs. 1. Different metallicity of MCs allows us to investigate the effect of the galactic metallicity on the properties of circumstellar materials. 2. Well-determined distances to the MCs allow us to accurately derive a luminosity of individual YSOs and to investigate the luminosity dependence of chemical properties of ices. In this presentation, we report the near-infrared (2-5 micron) spectroscopic observations of embedded massive YSOs in the LMC and SMC with the infrared satellite AKARI. The near-infrared spectroscopy of the SMCs YSOs by the space telescope is for the first time presented in this study. Absorption features of major ice species such as water, carbon dioxide and carbon monoxide are detected in the observed spectra of MCs YSOs thanks to the wavelength coverage and high sensitivity of the near-infrared spectrometer on board AKARI. Based on the observations, we found the systematic difference in the typical abundances of the above three major molecules in the LMC, SMC and our Galaxy. In addition, we found a correlation between column densities of ices and total luminosities of YSOs for the LMC samples. Based on these results, we are going to discuss how the metallicity affects the properties ices around an embedded YSO.
Ita Yoshifusa
Kaneda Hidehiro
Kato Daisuke
Kawamura Akiko
Onaka Takashi
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