Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20112703d&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #127.03; Bulletin of the American Astronomical Society, Vol. 34, p.1311
Other
Scientific paper
I investigate the kinematics of the interstellar medium (ISM) in the Magellanic Clouds using a large data set of Far Ultraviolet Spectroscopic Explorer (FUSE) observations and high-resolution optical Hα echelle data. In addition to studying the global aspects of the ISM in these galaxies, multiple FUSE sight lines through certain objects allow the study of trends within individual H 2 regions, supernova remanants (SNRs), superbubbles, and supergiant shells. Optical emission-line images are used to put the other observations in a broader context. In this paper, I will discuss results from one such FUV/optical study of SMC N66, the largest and brightest H 2 region in the Small Magellanic Cloud. N66 is powered by a dozen or more early-type stars including the dense star cluster NGC 346 and the luminous blue variable HD 5980. At least one known SNR, SNR 0057-7226, lies in projection within N66. Optical emission from the remnant is overwhelmed by the bright photoionized emission from the nebula, but the remnant has been detected by way of both FUV absorption and emission lines. I will present data from FUSE showing strong O 6 and C 3 emission from a position at the edge of SNR 0057-7226. In addition, new high-resolution, longslit Hα spectra across the nebula showing high- and low-velocity emission corresponding closely to the X-ray boundaries of the SNR. These FUV and optical data are used to determine the physical parameters of the shock and how it is interacting with N66. I find that ionizing radiation from the many massive cluster stars nearby likely affects the ionization balance in the post-shock gas, hindering the recombination of lower-ionization and neutral species that would normally occur behind the SNR shock. Given the prevalence of massive stars in clusters like this, it is likely that many SNRs should be found in or near bright H 2 regions. The inherent difficulty of distinguishing photoionized emission from shocked emission suggests that far ultraviolet observations provides a viable means to discover and study such remnants.
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