Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003omeg.conf..331b&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2000. Proceedings of the International Symposium. Held 19-21 January 2000 in Universi
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the result of the ASCA observation of a shell-like radio supernova remnant (SNR), G359.1-0.5. Unlike the radio morphology, X-rays from the SNR shows a center-filled structure. The spectrum of G359.1-0.5 has prominent Kα lines of He-like silicon and H-like sulfur. The plasma requires at least two temperature components: a lower temperature plasma (kT ~ 0.6 keV = 7 × 106 K) and a sulfur-rich plasma with higher temperature (kT ~ 4.4 keV = 5 × 107 K). The chemical composition of sulfur is found to be unusually high, larger than that of the solar vicinity by, at least, more than 10 times. We can estimate the total mass of silicon and sulfur to be 0.1M&sun; and 0.3M&sun;, respectively, where M&sun; is the mass of the sun of about 2 × 1033g. No current theory of nucleosynthesis in supernova explosions allows larger mass production of sulfur than that of silicon. This problem is solved with the assumption that the sulfur distribution is localized somewhere in SNR.
Bamba Aya
Koyama Katsuji
Sakano Masa
Yokogawa Jun
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