Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..765l&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, May 1, 1980, p. 765-768.
Astronomy and Astrophysics
Astrophysics
62
Magellanic Clouds, Nebulae, Stellar Motions, Supernova Remnants, Abundance, Astronomical Photography, Astronomical Spectroscopy, Digital Techniques, Nonthermal Radiation, Oxygen, Radio Emission
Scientific paper
A two-dimensional grid of digital spectra was obtained to map the rapidly moving (about 1000 km/s) material in the young LMC supernova remnant, N132 D. Various narrow-band images, each of a selected spectral region or velocity range, were constructed from these data; and a new direct photograph was also obtained. These data show that the high-velocity material, i.e., exceeding 600 km/s, consists of a series of knots lying in an annular structure of 6 pc diameter, nearly centered on the diffuse inner part of the nebula and apparently coincident with the nonthermal radio source. Such motions are consistent with annual expansion at 2250 km/s in a plane inclined at 45 deg to the line of sight and having a 600 km/s velocity of approach. These values give a dimensional age estimate of 1300 yr; if the outer (32 pc) shell and the rapidly moving knots are coeval, the velocity of the outer blast wave is of the order of 10,000 km/s.
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