英雄联盟老虎机优惠: Chinese scientist-led team discovers earliest protocluster

2021-01-27 14:50:33申博真人娱乐官网直营 Editor : Mo Hong'e ECNS App Download

申博真人娱乐官网直营,第二枚则被“标准2”和“先进海麻雀”的接连拦截,未被击中,最后自行坠海。”她还表示,“展览将加强中英两国间的文化交流,进一步增进两国间的长久关系。  比较引人注目就是酒类,有红酒、洋酒和白酒,记者看到现场有6瓶茅台酒和6瓶五粮液,茅台年份有50年和15年的,有的市场价为3万多元一瓶,起拍价为9480元/瓶,五粮液每瓶起拍价为3770元。  位于北京朝阳的一处别墅区,不直播时,邢丽会去逛逛街买买衣服,直播期间需要的服装都是自己准备。



(ECNS) -- A research project initiated by the University of Science and Technology of China (USTC), involving astronomers from China, the United States and Chile, has discovered the earliest protocluster known to date in the Universe, the university announced on Tuesday.

LAGER-z7OD1, as the earliest protocluster is called, was discovered in the Lyman Alpha Galaxies in the Epoch of Reionization (LARGE) project, according to the research team. Astronomers found this protocluster in data from the Dark Energy Camera on a four-meter Telescope at the CTIO observatory in Chile.

Using Magellan Telescope in Chile, the team confirmed it is the earliest known protocluster identified by spectroscopic measurements and that the Universe is only 770 million years old. Besides, the total volume of ionized bubbles generated by its member galaxies was found to be comparable to that of the protocluster, indicating the merging of ionized bubbles to form giant equivalents.

After the Big Bang, the Universe cooled down and entered the Dark Ages. With the formation of the first stars and galaxies, their ultraviolet photons began to ionize the surrounding neutral hydrogen, forming ionized bubbles, gradually turning the Universe transparent, and thus ending the Dark Ages. This overall phase change process in the early Universe is called Reionization. The observation of the cosmic reionization process and galaxies in this period is a very challenging task on the frontier of Astrophysics. 

Astronomers expect galaxies in the Universe's Epoch of Reionization to be strong Lyman-a emission line objects. 

By searching the Lyman-alpha emitting galaxies and analyzing the spatial distribution of galaxy candidates, the LAGER team has discovered LAGER-z7OD1, an over-dense region of 21 narrowband selected Lyman-alpha galaxies.

This discovery not only sets a redshift record but also provides an excellent observation target for further study of the cosmic reionization process and ionized bubbles.

The discovery was published in Nature Astronomy on Monday. 

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