大爆炸后不到1千兆年的类星体宿主中的千分之一级超级星暴
A Kiloparsec-Scale Hyper-Starburst in a Quasar Host Less than 1 Gigayear after the Big Bang
摘要：
类星体SDSS J114816.64+525150.3（红移z=6.42，宇宙年龄小于10亿年）的宿主星系的红外光度为2.2 × 10^13 L_sun，推测其主要动力来自恒星形成的大规模爆发。在一些极端明亮的星系中，如Arp 220，恒星形成的爆发集中在半径小于100秒差距的相对较小的中心区域。目前还不知道在早期宇宙中的活跃星系中，恒星是在什么尺度上形成的，这些星系可能正在经历恒星形成的初始爆发。我们确实知道，在早期的某个时刻，一定形成了类似于银河系球状凸起的结构。在这里，我们报告的[CII]发射的宿主星系J114816.64+525150.3的空间分辨图像，表明它的恒星形成气体分布在半径约750 pc的中心。该区域恒星形成率的平均面密度约为1000 M_sun/yr/kpc ^[2]。该表面密度与Arp 220中的峰值相当，尽管面积大约2个数量级。这个活跃的恒星形成事件可能会在这个系统中产生一个大质量的球状组成部分。
英文摘要：
The host galaxy of the quasar SDSS J114816.64+525150.3 (at redshift z=6.42, when the Universe was <1 billion years old) has an infrared luminosity of 2.2x10^13 L_sun, presumably significantly powered by a massive burst of star formation. In local examples of extremely luminous galaxies such as Arp220, the burst of star formation is concentrated in the relatively small central region of <100pc radius. It is unknown on which scales stars are forming in active galaxies in the early Universe, which are likely undergoing their initial burst of star formation. We do know that at some early point structures comparable to the spheroidal bulge of the Milky Way must have formed. Here we report a spatially resolved image of [CII] emission of the host galaxy of J114816.64+525150.3 that demonstrates that its star forming gas is distributed over a radius of ~750pc around the centre. The surface density of the star formation rate averaged over this region is ~1000 M_sun/yr/kpc^2. This surface density is comparable to the peak in Arp220, though ~2 orders of magnitudes larger in area. This vigorous star forming event will likely give rise to a massive spheroidal component in this system.
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