Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259l..85c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 259, Aug. 15, 1982, p. L85-L89. Research supported by the University
Astronomy and Astrophysics
Astrophysics
98
Interstellar Gas, Shock Waves, Stellar Envelopes, Stellar Winds, Supernova Remnants, Shock Wave Interaction, Stellar Mass Ejection
Scientific paper
The young remnants of galactic Type I supernovae (SN 1006, SN 1572, and SN 1604) appear to be interacting with moderately dense gas (not less than 0.1/cu cm). If the gas is the ambient interstellar medium, the observations suggest that gas of this density is fairly pervasive. If the gas is circumstellar, there are important implications for the progenitors of Type I supernovae. A plausible density distribution for circumstellar gas is rho varies inversely as the square of r. The expansion of a supernova into such a medium is examined and is compared with expansion into a uniform medium. The two cases can be distinghuished on the basis of their density profiles and their rates of expansion. Currently available data favor the hypothesis of expansion in a uniform medium for all three Type I remnants; the evidence is the strongest for SN 1572 and the weakest for SN 1604. Further X-ray and radio observations of the galactic remnants and of extragalactic Type I supernovae should serve to test this hypothesis.
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