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arXiv 1111.1654astro-ph.GA
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来自大质量恒星反馈的放射性和运动学示踪剂

Radioactive and kinematic tracers of feedback from massive stars

R. Voss

摘要:

年轻恒星喷出物与星际介质的混合是恒星形成与星系演化相互作用的重要过程。放射性同位素$^{26}$ Al提供了一个了解这些过程的独特窗口,它的$γ$ -射线衰变线在1.8 MeV。它的平均寿命为$\sim$ 100万年,是大质量恒星核合成的长期示踪物。我们的人口合成代码模型的喷射$^{26}$铝,连同$^{60}$铁,动能和紫外辐射的人口的大质量恒星。我们已经应用该代码来研究附近的猎户座地区和更大规模的船底座地区,并发现与观测约束很好的协议。

英文摘要:

The mixing of ejecta from young stars into the interstellar medium is an important process in the interplay between star formation and galaxy evolution. A unique window into these processes is provided by the radioactive isotopes $^{26}$Al, traced by its $γ$-ray decay lines at 1.8 MeV. With a mean lifetime of $\sim$1 Myr it is a long-term tracer of nucleosynthesis for massive stars. Our population synthesis code models the ejection of $^{26}$Al, together with the $^{60}$Fe, the kinetic energy and UV radiation for a population of massive stars. We have applied the code to study the nearby Orion region and the more massive Carina region and found good agreement with observational constraints.

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