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제목 :  Herschel and Millimeter Observations of Supernova Remnants

연사 :  노정희 박사님 (NASA/AMES)

언어 :  English


요약

     Supernovae (SNe) are among the most violent events in the Universe, ejecting gas on galactic scales and returning material from dense molecular clouds into the more diffuse interstellar medium. Recently star-formation activities are frequently found in infrared dark clouds and the interstellar turbulence may cause the star formation. I present Herschel and millimeter observations toward supernova remnants. The spectra revealed rich molecular lines of high-J and low-J CO, water, hydroxyl and a few atomic lines of oxygen and carbon. A very broad ortho-water line with a width of 144 km/s was detected from G349.7+0.2, and the 144 km/s component is one of the broadest molecular lines detected in the ISM. Numerous high-J CO lines are detected from G349.7+0.2 while G357.7+0.3 shows broad low-J CO but no high-J CO lines. We observe a strong correlation between water and hot CO lines. The detection of very broad water line is the direct evidence of short-lived molecules that have not been destroyed in high velocity J-shocks. We also present shocked molecular hydrogen lines from HB 3 and detection of broad CO lines. I will discuss the abundance and excitation of oxygenbearing molecules, revisit the cooling budget by molecules, compare with those in other objects such as protostars and star-forming regions, and discuss the impact of turbulence due to the shock to star-formation.

 I will introduce two large telescope projects that I participate in. The Stratospheric Observatory for Infrared Astronomy (SOFIA) is a 2.5 m air-born telescope, flying above more than 99% of atmospheric water vapor, avoiding strong telluric absorption lines. I will show science capabilities of the imaging and spectroscopy instruments in the near-IR to far-IR.
I will also present the introduction of the Large Synoptic Survey Telescope (LSST) project, the LSST observing strategy and its optimization for SN science, and ideas of the LSST follow-up optical/infrared spectroscopy.

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