Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003omeg.conf..240t&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
Recently, COMPTEL has detected γ-rays of 1157keV from 44Ti in the direction of the SNR RX J0852-04621. Since 44Ti is a product of explosive nucleosynthesis and its half-life, τ, is about 60yrs, RX J0852-0462 must be a young supernova remnant and radiation is dominated by the ejecta rather than by interstellar matter. We have detected an X-ray emission line at 4.1 ± 0.2 keV which is thought to come from highly ionized Ca. The emission line is so far only seen in the northwest shell region of RX J0852-0462. The X-ray spectrum can be well fitted with that of thin hot plasma of cosmic abundances except that of Ca, which is overabundant by a factor of about 7. Assuming that most of the Ca is 44Ca, which originates from 44Ti by radioactive decay, we estimate that there is about 8 × 10-4M&sun; of Ca. Combining the amount of 44Ca and the observed flux of the 44Ti γ-ray line, the age of RX J0852-0462 is around 100yrs.
Aschenbach Bernd
Hiraga Junko
Miyata Emi
Tsunemi Hiroshi
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