A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang

doi:10.1126/science.abc1893

GSTDTAP > 气候变化

DOI	10.1126/science.abc1893
	A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang
	Federico Lelli; Enrico M. Di Teodoro; Filippo Fraternali; Allison W. S. Man; Zhi-Yu Zhang; Carlos De Breuck; Timothy A. Davis; Roberto Maiolino
	2021-02-12
发表期刊	Science
出版年	2021
英文摘要	Galaxy formation in the early Universe is thought to have been a chaotic process, producing disturbed and asymmetric galaxy morphologies. Over billions of years, galaxies dynamically relaxed to form stable morphological features. Lelli et al. observed a distant galaxy at a redshift when the Universe was 1.2 billion years old (see the Perspective by Wardlow). They used gas and dust emission to measure its kinematics, and then modeled the mass distribution within the galaxy. The authors found that the galaxy contains a massive stellar bulge and a uniformly rotating disk, features that models predict take billions of years to form. These results indicate that galaxy evolution is a more rapid process than previously thought. Science , this issue p. [713][1]; see also p. [674][2] Cosmological models predict that galaxies forming in the early Universe experience a chaotic phase of gas accretion and star formation, followed by gas ejection due to feedback processes. Galaxy bulges may assemble later via mergers or internal evolution. Here we present submillimeter observations (with spatial resolution of 700 parsecs) of ALESS 073.1, a starburst galaxy at redshift z≃5 when the Universe was 1.2 billion years old. This galaxy’s cold gas forms a regularly rotating disk with negligible noncircular motions. The galaxy rotation curve requires the presence of a central bulge in addition to a star-forming disk. We conclude that massive bulges and regularly rotating disks can form more rapidly in the early Universe than predicted by models of galaxy formation. [1]: /lookup/doi/10.1126/science.abc1893 [2]: /lookup/doi/10.1126/science.abg2907
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314088
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Federico Lelli,Enrico M. Di Teodoro,Filippo Fraternali,et al. A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang[J]. Science,2021.
APA	Federico Lelli.,Enrico M. Di Teodoro.,Filippo Fraternali.,Allison W. S. Man.,Zhi-Yu Zhang.,...&Roberto Maiolino.(2021).A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang.Science.
MLA	Federico Lelli,et al."A massive stellar bulge in a regularly rotating galaxy 1.2 billion years after the Big Bang".Science (2021).