Radioactivity of the Key Isotope 44Ti in SN 1987A
Abstract
We investigate radioactivity from the decay sequence of 44Ti in a young supernova remnant SN 1987A. We perform Monte-Carlo simulations of degradation of the nuclear lines to explain a late-time bolometric luminosity which is estimated from optical and near-infrared observation at 3600 days after the explosion. Assuming the distance to LMC in between 45.5 and 52.1 kpc, we have obtained the initial 44Ti mass of (0.82-2.3) 10^{-4} solar mass within the current uncertainty of the physical quantities. The resulting fluxes of gamma- and hard X-rays emerged from the 44Ti decay are estimated and compared with the line sensitivity of the INTEGRAL/SPI on board and that of NeXT X-ray satellite planned to be launched in 2010. The effect of 44Ti ionization on the estimated fluxes is briefly remarked.
Keywords
Cite
@article{arxiv.astro-ph/0312620,
title = {Radioactivity of the Key Isotope 44Ti in SN 1987A},
author = {Yuko Motizuki and Shiomi Kumagai},
journal= {arXiv preprint arXiv:astro-ph/0312620},
year = {2009}
}
Comments
6 pages, 2 figures; Invited talk, in Proceedings of Tours Symposium on Nuclear Physics V (Tours2003), Tours, France, August 2003, eds. H. Utsunomiya et al., AIP Conference Series, in press