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K.-I. Seon, J.-H. Park, I.-S. Yuk, W. Han (Korea Astronomy Observatory), K.-S. Ryu (SaTReC, KAIST), J.-H. Shinn, K.-W. Min (Dept. of Physics, KAIST), J. Edelstein, E. J. Korpela, K. Nishikida (Univ. of California, Berkeley)
We present far-ultraviolet spectral maps of the entire Cygnus Loop region observed with the FIMS (Far ultraviolet IMaging Spectrograph; also known as SPEAR) onboard the first Korean scientific satellite, STSAT-1. The global features are investigated with an unprecendented wide field of view of the FIMS. We observed several atomic emission lines including C IV (~1550Å), He II (~1640Å), O III] (~1675Å), O IV] + Si IV (~1440Å), and O VI (~1035Å), and their spectral maps were made. The spatial distribution of the C IV (~ 1550Å) emission is that of a limb-brightened shell, and similar to optical maps. The spectral maps show clearly the differences of surface brightness distributions in each emission line. The maps are used to investigate the global features of shock phenomena in the Cygnus Loop.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.