arXivDaily arXiv每日学术速递 周一至周五更新
arXiv astro-ph/0401034astro-ph
收藏

红移z=4.1的原星系团中大量的“莱曼破裂”星系

A large population of 'Lyman-break' galaxies in a protocluster at redshift z=4.1

George K. Miley, Roderik A. Overzier, Zlatan I. Tsvetanov, the ACS/GTO Team

摘要:

最大质量的星系和最丰富的星系团被认为是从相对于周围空间质量密度增加最大的区域出现的。遥远的射电星系可能会精确定位富星系团的祖先,因为它们是与高密度星系相关的大质量系统,在氢的莱曼α线中明亮。探测高红移星系的一个强有力的技术是在Lya的短波长处寻找星系颜色中特有的“莱曼断裂”特征,这是由于星系的辐射被居间的星系介质吸收。在这里,我们报告最遥远的候选原星团,TN J1338-1942在红移z=4.1多色成像。我们发现了大量的物体的特征颜色的星系在红移,我们表明,这种过剩是集中在周围的目标占主导地位的射电星系。因此,我们的数据表明,TN J1338-1942确实是一个丰富的本星系团的最远的星系团祖先,而且星系团在宇宙只有现在年龄的10%时就开始形成了。

英文摘要:

The most massive galaxies and the richest clusters are believed to have emerged from regions with the largest enhancements of mass density relative to the surrounding space. Distant radio galaxies may pinpoint the locations of the ancestors of rich clusters, because they are massive systems associated with overdensities of galaxies that are bright in the Lyman-alpha line of hydrogen. A powerful technique for detecting high-redshift galaxies is to search for the characteristic `Lyman break' feature in the galaxy colour, at wavelengths just shortwards of Lya, due to absorption of radiation from the galaxy by the intervening galactic medium. Here we report multicolour imaging of the most distant candidate protocluster, TN J1338-1942 at a redshift z=4.1. We find a large number of objects with the characteristic colours of galaxies at that redshift, and we show that this excess is concentrated around the targeted dominant radio galaxy. Our data therefore indicate that TN J1338-1942 is indeed the most distant cluster progenitor of a rich local cluster, and that galaxy clusters began forming when the Universe was only 10 per cent of its present age.

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。

↑