Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..303w&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 44, no. 3, 1992, p. 303-308. Research supported by NNSFC and
Astronomy and Astrophysics
Astronomy
34
Supernova Remnants, X Ray Astronomy, Astronomical Models, Ginga Satellite, Heao 2, X Ray Spectra
Scientific paper
Hard X-rays with energies of up to 20 keV were observed from IC 443 with the X-ray astronomy satellite Ginga. The X-ray flux at energies below 6 keV was found to be consistent with that seen during earlier observations with the Einstein Observatory and HEAO A-2; the X-ray spectrum was observed to be smoothly extended to 20 keV, in which the hard X-ray part could be fitted with a power law of a photon index of about two. The iron line feature was not conspicuous; the equivalent width for the iron emission line was about 0.25 keV. Although an X-ray emission model of IC 443 cannot be uniquely derived from the obervations, it is likely that the hard X-ray are emitted from a shock-heated plasma with a temperature higher than 10 keV and a density smaller than 0.1 atoms cu/cm, which is located in the south-western and western regions of IC 443. This model implies that the age of IC 443 is about one thousand years instead of the previous estimate of 10,000 yr. It is suggested that IC 443 is the remnant of a supernova in AD 837.
Asaoka Ikuko
Hayakawa Saito
Koyama Katsuji
Wang Zhen R.
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