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ID: 5764.0, MPI für extraterrestrische Physik / High Energy Astrophysics at MPE
COMPTEL upper limits for the 56Co γ-ray emission from SN1998bu
Authors:Georgii, R.; Plüschke, S.; Diehl, R.; Lichti, G. G.; Schönfelder, V.; Bloemen, H.; Hermsen, W.; Ryan, J.; Bennett, K.
Date of Publication (YYYY-MM-DD):2002-11
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:2
Start Page:517
End Page:523
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Supernova 1998bu in the galaxy M 96 was observed by COMPTEL for a total of 88 days starting 17 days after the explosion. We searched for a signal in the 847 keV and 1238 keV lines of radioactive Co-56 from this type Ia supernova. Using several different analysis methods, we did not detect SN1998bu. Our measurements should have been sensitive enough to detect Co-60 gamma-rays as predicted from supernova models. Our 2sigma flux limit is 2.3 x 10(-5) photons cm(-2) s(-1); this would correspond to 0.35 M. of ejected Ni-56, if SN1998bu were at a distance of 11.3 Mpc and transparent to MeV gamma rays for the period of our measurements. We discuss our measurements in the context of common supernova models, and conclude disfavoring a supernova event with large mixing and major parts of the freshly-generated radioactivity in outer layers.
Free Keywords:stars : supernovae : individual : SN1998bu; gamma-rays : observations; nucleosynthesis
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Max Planck Inst Extraterr Phys, Postfach 1312, D-85741; Garching, Germany; Max Planck Inst Extraterr Phys, D-85741 Garching, Germany; Tech Univ Munich, D-85747 Garching, Germany; SRON, Inst Space Res, NL-3584 CA Utrecht, Netherlands; Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA; European Space Agcy, ESTEC, Div Sci, NL-2200 AG Noordwijk, Netherlands
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