CGR0/OSSE OBSERVATIONS OF THE CASSIOPEIA-A SUPERNOVA REMNANT

被引：18

作者：

THE, LS

LEISING, MD

CLAYTON, DD

JOHNSON, WN

KINZER, RL

KURFESS, JD

STRICKMAN, MS

JUNG, GV

GRABELSKY, DA

PURCELL, WR

ULMER, MP

机构：

[1] USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375

[2] UNIV SPACE RES ASSOCIATES,WASHINGTON,DC 20375

[3] NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208

来源：

ASTROPHYSICAL JOURNAL | 1995年 / 444卷 / 01期

关键词：

GAMMA RAYS; OBSERVATIONS; ISM; INDIVIDUAL (CASSIOPEIA A); NUCLEAR REACTIONS; NUCLEOSYNTHESIS; ABUNDANCES; SUPERNOVA REMNANTS;

D O I：

10.1086/175600

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cassipeia A, the youngest known supernova remnant in the Galaxy and a strong radio and X-ray source, was observed by OSSE 1992 July 16-August 6. Its close distance (similar to 3 kpc) and its young age (similar to 300 yr) make Cas A the best candidate among known supernova remnants for detecting Ti-44 gamma-ray lines. We find no evidence of emission at 67.9 keV, 78.4 keV, or 1.157 MeV, the three strongest Ti-44 decay lines. From simultaneous fits to the three lines our 99% confidence upper limit to the flux in each line is 5.5 x 10(-5) gamma cm(-2) s(-1). We also report upper limits for the 4.44 MeV C-12 nuclear de-excitation line, which could be produced by interactions of accelerated particles in the supernova remnant, and for the hard X-ray continuum.

引用

页码：244 / 250

页数：7

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