SWIFT/BAT DETECTION OF HARD X-RAYS FROM TYCHO'S SUPERNOVA REMNANT: EVIDENCE FOR TITANIUM-44

被引：14
作者：
Troja, E. [1 ,2 ]
Segreto, A. [3 ]
La Parola, V. [3 ]
Hartmann, D. [4 ]
Baumgartner, W. [1 ]
Markwardt, C. [1 ]
Barthelmy, S. [1 ]
Cusumano, G. [3 ]
Gehrels, N. [1 ]
机构：
[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[2] Univ Maryland, Dept Phys & Astron, College Pk, MD 20742 USA
[3] INAF IASF Palermo, I-90146 Palermo, Italy
[4] Clemson Univ, Dept Phys & Astron, Clemson, SC 29631 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 797卷 / 01期
关键词：
gamma rays: general; ISM: individual objects (SN 1572; Tycho's SNR); ISM: supernova remnants; nuclear reactions; nucleosynthesis; abundances; CHANDRASEKHAR MASS MODELS; DELAYED-DETONATION MODELS; LINE EMISSION; IA SUPERNOVAE; WHITE-DWARF; NUCLEOSYNTHESIS; BAT; CONSTRAINTS; CASSIOPEIA; PROGENITOR;
D O I：
10.1088/2041-8205/797/1/L6
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report Swift/Burst Alert Telescope survey observations of the Tycho's supernova remnant, performed over a period of 104 months since the mission's launch. The remnant is detected with high significance (> 10 sigma) below 50 keV. We detect significant hard X-ray emission in the 60-85 keV band, above the continuum level predicted by a simple synchrotron model. The location of the observed excess is consistent with line emission from radioactive titanium-44, so far reported only for Type II supernova explosions. We discuss the implications of these results in the context of the galactic supernova rate, and nucleosynthesis in Type Ia supernova.
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页数：5
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