A kiloparsec-scale hyper-starburst in a quasar host less than 1 gigayear after the Big Bang
A kiloparsec-scale hyper-starburst in a quasar host less than 1 gigayear after the Big Bang
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DOI：
10.1038/nature07681
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发表时间：
2009-02
期刊：
影响因子：
64.8
通讯作者：
F. Walter;D. Riechers;P. Cox;R. Neri;C. Carilli;F. Bertoldi;A. Weiss;R. Maiolino
中科院分区：
文献类型：
--
作者：
F. Walter;D. Riechers;P. Cox;R. Neri;C. Carilli;F. Bertoldi;A. Weiss;R. Maiolino
类星体SDSS J114816的宿主星系。+525150.3(红移z=6.42时，当时宇宙的年龄不到10亿岁)的红外光度是太阳的2.2x1013倍，据推测，这是由恒星形成的巨大爆炸提供的能量。在极亮星系的局部例子中，如Arp 220，恒星形成的爆发集中在一个相对较小的中心区域，半径为<；100pc。尚不清楚恒星在早期宇宙的活跃星系中形成的尺度，当时它们可能正在经历最初的恒星形成爆发。我们确实知道，在早期的某个时候，一定已经形成了类似于银河系球状凸起的结构。这里我们报道了J114816宿主星系[C II]发射的空间分辨图像。+525150.3，这表明它的恒星形成气体分布在中心周围半径约750pC的范围内。该区域平均恒星形成率的面密度为∼，1000年-1kpc-2。这个表面密度与Arp 220中的峰值相当，尽管面积大约大了两个数量级。这一激烈的恒星形成事件很可能会在这个系统中产生一个巨大的球体成分。
The host galaxy of the quasar SDSS J114816. 64+ 525150.3 (at redshift z= 6.42, when the Universe was less than a billion years old) has an infrared luminosity of 2.2× 1013 times that of the Sun,, presumably significantly powered by a massive burst of star formation,,,. In local examples of extremely luminous galaxies, such as Arp 220, the burst of star formation is concentrated in a relatively small central region of< 100 pc radius,. It is not known on which scales stars are forming in active galaxies in the early Universe, at a time when they are probably undergoing their initial burst of star formation. We do know that at some early time, structures comparable to the spheroidal bulge of the Milky Way must have formed. Here we report a spatially resolved image of [C ii] emission of the host galaxy of J114816. 64+ 525150.3 that demonstrates that its star-forming gas is distributed over a radius of about 750 pc around the centre. The surface density of the star formation rate averaged over this region is∼ 1,000 year-1 kpc-2. This surface density is comparable to the peak in Arp 220, although about two orders of magnitude larger in area. This vigorous star-forming event is likely to give rise to a massive spheroidal component in this system.