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首页> 外文期刊>The Astrophysical journal >KECK OBSERVATIONS OF THE MOST DISTANT GALAXY: 8C 1435 + 63 AT z = 4.25
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KECK OBSERVATIONS OF THE MOST DISTANT GALAXY: 8C 1435 + 63 AT z = 4.25

机译：最远星系的关键观测：8C 1435 + 63 AT z = 4.25

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摘要

We report on Keck observations and confirm the redshift of the most distant galaxy known: 8C 1435 + 63 at z = 4.25. The spectrum shows a strong Lyα line, a Lyα forest continuum break and a continuum break at λ_(rest) = 912 A. The Lya emission is spatially extended and roughly aligned with the radio source. The galaxy shows a double structure in the I-band (λ_(rest) ≈ 1500 A) which is aligned with the radio axis; the two I-band components spatially coincide with the nuclear and southern radio components. Some fraction of the I-band emission could be due to a nonthermal process such as inverse Compton scattering. In the K-band (λ_(rest) ≈ 4200 A), which may be dominated by starlight, the galaxy has a very low surface brightness, diffuse morphology. The K morphology shows little relationship to the radio source structure, although the major axis of the K emission is elongated roughly in the direction of the radio source axis. The galaxian continuum is very red (I — K > 4) and if the K continuum is due to starlight, implies a formation redshift of z_f > 5. We speculate that this galaxy may be the progenitor of a present-day cD galaxy.
机译：我们报告了凯克的观测结果，并确认了已知的最遥远星系的红移：z = 4.25时为8C 1435 + 63。频谱显示出很强的Lyα线，Lyα森林的连续破坏和λ_（rest）= 912 A的连续破坏。Lya发射在空间上扩展并且与无线电源大致对齐。银河系在I波段（λ_（rest）≈1500 A）显示出与光轴对准的双重结构。这两个I波段分量在空间上与核电和南方无线电分量重合。 I波段发射的一部分可能是由于非热过程（例如逆康普顿散射）引起的。在可能由星光主导的K波段（λ_（rest）≈4200 A）中，星系的表面亮度非常低，呈漫射形态。尽管K发射的长轴在无线电源轴的方向上大致拉长，但K形态与无线电源结构几乎没有关系。星系连续体是非常红色的（I K> 4），如果K连续体是由于星光引起的，则意味着z_f> 5的形成红移。我们推测该星系可能是当今cD星系的祖先。

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