Cosmic Ray Production of Beryllium and Boron at High Redshift
Cosmic Ray Production of Beryllium and Boron at High Redshift
复制标题
高红移下铍和硼的宇宙射线产生
DOI：
10.1086/524931
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Inoue
中科院分区：
文献类型：
--
作者：
E. Rollinde;D. Maurin;E. Vangioni;K. Olive;S. Inoue
最近，在银河系晕的第二星族恒星中对6Li的新观测表明，这种同位素的丰度高得惊人，比其预测的原始值高出约1000倍。在以前的论文中，宇宙射线在星系际介质（IGM）中诱导产生这种同位素的宇宙学模型已经发展到解释在低金属丰度下观测到的丰度。在本文中，我们给出了对~ 6Li的这个约束，计算了IGM中D，Be和B的非热演化和红移。除了在IGM的宇宙学宇宙射线相互作用，我们还包括额外的过程驱动的超新星爆炸：中微子spiritus和低能量的组成部分，在结构喷出的外流到IGM。我们考虑到CNO CR撞击星系际气体。虽然在银盘中占次要地位，但由于结构（CR起源）和IGM之间的差异金属富集，该过程被证明在IGM中产生了大量的Be和B。我们还考虑了由此产生的河外伽玛射线背景，我们发现这是远远低于现有的数据。计算是在层次结构形成的框架下进行的，考虑了几个星星的形成历史，包括第三星族恒星。我们发现，D的生产是可以忽略不计的，一个潜在的可检测的Be和B高原是由这些过程中产生的银河系的形成时间（z 3）。
Recently, new observations of 6Li in Population II stars of the Galactic halo have shown a surprisingly high abundance of this isotope, about a thousand times higher than its predicted primordial value. In previous papers, a cosmological model for the cosmic-ray-induced production of this isotope in the intergalactic medium (IGM) has been developed to explain the observed abundance at low metallicity. In this paper, given this constraint on the 6Li, we calculate the nonthermal evolution with redshift of D, Be, and B in the IGM. In addition to cosmological cosmic ray interactions in the IGM, we include additional processes driven by supernova explosions: neutrino spallation and a low-energy component in the structures ejected by outflows to the IGM. We take into account CNO CRs impinging on the intergalactic gas. Although subdominant in the Galactic disk, this process is shown to produce the bulk of Be and B in the IGM, due to the differential metal enrichment between structures (where CRs originate) and the IGM. We also consider the resulting extragalactic gamma-ray background, which we find to be well below existing data. The computation is performed in the framework of hierarchical structure formation, considering several star formation histories, including Population III stars. We find that D production is negligible and that a potentially detectable Be and B plateau is produced by these processes at the time of the formation of the Galaxy (z ∼ 3).
DOI：
10.1111/j.1365-2966.2005.09227.x
发表时间：
2005-05
影响因子：
4.8
作者：
S. Gabici;P. Blasi;Giulia Vannoni
通讯作者：
S. Gabici;P. Blasi;Giulia Vannoni
影响因子：
4.4
作者：
Heger, A;Kolbe, E;Woosley, SE
通讯作者：
Woosley, SE
影响因子：
5
作者：
M. Kusakabe;T. Kajino;G. Mathews
通讯作者：
M. Kusakabe;T. Kajino;G. Mathews