Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-26
Astrophys.J. 644 (2006) L175-L180
Astronomy and Astrophysics
Astrophysics
13 pages, 3 figures, 1 table, accepted for publication in ApJL
Scientific paper
10.1086/505201
We present far-ultraviolet (FUV) spectral images, measured at C IV 1550, He II 1640, Si IV+O IV] 1400, and O III] 1664, of the entire Cygnus Loop, observed with the Spectroscopy of Plasma Evolution from Astrophysical Radiation (SPEAR) instrument, also known as FIMS. The spatial distribution of FUV emission generally corresponds with a limb-brightened shell, and is similar to optical, radio and X-ray images. The features found in the present work include a ``carrot'', diffuse interior, and breakout features, which have not been seen in previous FUV studies. Shock velocities of 140-160 km/s is found from a line ratio of O IV] to O III], which is insensitive not only to resonance scattering but also to elemental abundance. The estimated velocity indicates that the fast shocks are widespread across the remnant. By comparing various line ratios with steady-state shock models, it is also shown that the resonance scattering is widespread.
Edelstein Jerry
Han Wonyong
Kim Il-Joong
Korpela Eric J.
Min Kyoung-Wook
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