arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1302.3067astro-ph.HE
收藏

伽马射线暴吸积盘和相关外流中的核合成

Nucleosynthesis in the gamma-ray burst accretion disks and associated outflows

Indrani Banerjee, Banibrata Mukhopadhyay

摘要:

我们研究了由II型中微子形成的伽马射线暴(GRB)吸积盘和从这些盘发射的外流中的核合成。我们处理的吸积盘具有相对较低的吸积率:0.001 M_sun s^{-1} <~ Mdot <~ 0.01 M_sun s^{-1},因此它们主要是平流主导的。我们报道了在该盘中合成了几种不寻常的核,如~(31)P、~(39)K、~(43)Sc、~(35)Cl和钛、钒、铬、锰、铜等多种同位素。我们还证实,铁,钴,镍,氩,钙,硫和硅的同位素得到合成的磁盘,如以前的作者所示。这样合成的重元素中的大部分从盘中喷出,并在流出物中存活下来。事实上,在几个伽玛暴的X射线余辉中已经观察到许多这些重元素的发射线。

英文摘要:

We investigate nucleosynthesis inside the gamma-ray burst (GRB) accretion disks formed by the Type II collapsars and outflows launched from these disks. We deal with accretion disks having relatively low accretion rates: 0.001 M_sun s^{-1} <~ Mdot <~ 0.01 M_sun s^{-1} and hence they are predominantly advection dominated. We report the synthesis of several unusual nuclei like 31P, 39K, 43Sc, 35Cl and various isotopes of titanium, vanadium, chromium, manganese and copper in the disk. We also confirm that isotopes of iron, cobalt, nickel, argon, calcium, sulphur and silicon get synthesized in the disk, as shown by previous authors. Much of these heavy elements thus synthesized are ejected from the disk and survive in the outflows. Indeed, emission lines of many of these heavy elements have been observed in the X-ray afterglows of several GRBs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑