Other
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..551m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 1, 1990, p. 551-556.
Other
9
Gas Ionization, H Alpha Line, Interstellar Matter, Radial Velocity, Supernova 1987A, Astronomical Spectroscopy, Echelle Gratings, Emission Spectra, Velocity Distribution
Scientific paper
Profiles of the O III 5007 A and H-alpha emission lines have been obtained along three NS, 155-arcsec long, slit positions in the vicinity of SN 1987A with an echelle spectrometer. Extensive clouds of ionized gas with the distinctly separate radial velocities of 255, 280, 300, and 318 km/s are present. Those at 255 and 280 km/s closely match velocity components in the interstellar absorption line profiles found in the light of SN 1987A by other authors, and must consequently be from sheets of neutral and ionized interstellar gas on the near-side of the supernova. The 300 and 318 km/s clouds are likely to be similar sheets on the far-side. In the positional velocity array for the slit position closest to SN 1987A, two ridges project about 100 km/s towards positive radial velocities on either side of the supernova. These appear to originate in the 255 km/s extensive sheet. It is proposed that these ridges could be two sides of the asymmetric, wind-blown cavity about 8 pc across, into which SN 1987A is now expanding.
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