FUSE Observations of the XA Region in the Cygnus Loop SNR

Details FUSE Observations of the XA Region in the Cygnus Loop SNR FUSE Observations of the XA Region in the Cygnus Loop SNR

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20510618s&link_type=abstract

American Astronomical Society Meeting 205, #106.18; Bulletin of the American Astronomical Society, Vol. 36, p.1523

Astronomy and Astrophysics

Astronomy

Scientific paper

The XA region on the eastern limb of the Cygnus Loop supernova remnant has been formed by a shock-cloud interaction. We present spectra of the XA region obtained with the Far Ultraviolet Spectroscopic Explorer, which operates in the 900--1200Å wavelength region. Six locations were observed in order to study different parts of the shocked region, from the dense cloud core to associated lower density gas. The spectra show numerous emission lines from several elements and a range of ionization stages. The measured line strengths and line ratios show the presence of shocks with velocities ranging from about 120 km s-1 to over 180 km s-1. They also indicate that elemental abundances are probably solar. By comparing the measurements at the six locations observed by FUSE with ground based images, we find that the O VI λ 1032 emission is more uniformly distributed than the [Ne V] λ 3426 emission, though both O5+ and Ne4+ trace gas at similar levels of ionization. The difference could be due to resonance line scattering of O VI, or because [Ne V] comes from a more restricted temperature range.
We acknowledge support from NASA grant NAG5-11581 to the Johns Hopkins University.

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