Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..220v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 220-225.
Astronomy and Astrophysics
Astronomy
14
Astronomical Models, Far Ultraviolet Radiation, Spaceborne Astronomy, Supernova Remnants, Carbon, Helium Ions, Magellanic Clouds, Oxygen Spectra
Scientific paper
The Hopkins Ultraviolet Telescope has been used to obtain the first sub-Lyman-alpha spectrum of an extragalactic SNR, N49, in the LMC. Emission from O VI 1032, 1038 has been detected in this spectral region. The measured fluxes of C IV, semiforbidden O IV, and O VI and the upper limit on N V provide stringent limits on the shocks responsible for the bulk of the O VI production. O VI cannot originate in the shocks with velocities of 140 km/s or less because the postshock temperature is not high enough. The nonradiative main blast wave cannot account for the brightness of the observed O VI emission. The majority of the O VI must originate in an optically faint system of shocks with velocities of 190-270 km/s and preshock densities of 20-40 cu cm. The emission from such high-velocity shocks is dominated by O VI.
Blair William Patrick
Bowers Charles W.
Davidsen Arthur F.
Dixon William Van Dyke
Durrance Samuel T.
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