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27 papers · 2 filters
Radioactivity of the Key Isotope 44Ti in SN 1987A
Yuko Motizuki, Shiomi Kumagai
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 explai…
Evidence From HETE-2 For GRB Evolution With Redshift
C. Graziani, D. Q. Lamb, T. Sakamoto +3
After taking into account threshold effects, we find that the isotropic-equivalent energies E_iso and luminosities L_iso of gamma-ray bursts (GRBs) are correlated with redshift at…
Signatures of Ultra-High Energy Cosmic Ray Composition from Propagation of Nuclei in Intergalactic Photon Fields
Tokonatsu Yamamoto, Keiichi Mase, Masahiro Takeda +2
We present a calculation of nuclei propagation with energies above 1 EeV in the intergalactic photon field. The calculation is based on a Monte Carlo approach for the nucleus-photo…
Early (0.3 day) R-band light curve of the optical afterglow of GRB030329
Y. Urata, T. Miyata, S. Nishiura +13
We observed the optical afterglow of the bright gamma-ray burst GRB030329 on the nights of 2003 March 29, using the Kiso observatory (the University of Tokyo) 1.05 m Schmidt telesc…
Importance of Prolate Neutrino Radiation in Core-Collapse Supernovae: The Reason for the Prolate Geometry of SN1987A?
Hideki Madokoro, Tetsuya Shimizu, Yuko Motizuki
We have carried out 2-D simulations of core-collapse supernova explosions. The local neutrino radiation field is assumed to have its maximum value either at the symmetry (polar) ax…
The very high state accretion disk structure from the galactic black hole transient XTE J1550-564
Aya Kubota, Chris Done
The 1998 outburst of the bright Galactic black hole binary system XTE J1550-564 was used to constrain the accretion disc structure in the strongly Comptonised very high state spect…