Radioactive 26Al from massive stars in the Galaxy

被引:576
作者
Diehl, R [1 ]
Halloin, H
Kretschmer, K
Lichti, GG
Schönfelder, V
Strong, AW
von Kienlin, A
Wang, W
Jean, P
Knödlseder, J
Roques, JP
Weidenspointner, G
Schanne, S
Hartmann, DH
Winkler, C
Wunderer, C
机构
[1] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[2] Univ Toulouse 3, F-31028 Toulouse, France
[3] Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France
[4] CEA Saclay, DSM, DAPNIA, Serv Astrophys, F-91191 Gif Sur Yvette, France
[5] Clemson Univ, Clemson, SC 29634 USA
[6] ESA, ESTEC, SCI SD, NL-2201 AZ Noordwijk, Netherlands
[7] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
关键词
D O I
10.1038/nature04364
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Gamma-rays from radioactive Al-26 ( half-life similar to 7.2 x 10(5) years) provide a 'snapshot' view of continuing nucleosynthesis in the Galaxy(1). The Galaxy is relatively transparent to such gamma-rays, and emission has been found concentrated along its plane(2). This led to the conclusion(1) that massive stars throughout the Galaxy dominate the production of Al-26. On the other hand, meteoritic data show evidence for locally produced Al-26, perhaps from spallation reactions in the protosolar disk(3-5). Furthermore, prominent gamma-ray emission from the Cygnus region suggests that a substantial fraction of Galactic Al-26 could originate in localized star-forming regions. Here we report high spectral resolution measurements of Al-26 emission at 1808.65 keV, which demonstrate that the Al-26 source regions corotate with the Galaxy, supporting its Galaxy-wide origin. We determine a present-day equilibrium mass of 2.8 (+/- 0.8) solar masses of Al-26. We use this to determine that the frequency of core collapse ( that is, type Ib/c and type II) supernovae is 1.9 (+/- 1.1) events per century.
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页码:45 / 47
页数:3
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