A radio galaxy at redshift 4.41
Article Abstract:
The discovery of a radio galaxy (6CO140 + 326) at redshift 4.41, showing no proof of either a stellar continuum or an unobscured quasar nucleus, is reported. It is inferred that the galaxy associated with the radio source is neither completely formed nor obviously in the process of producing stars. Its implications are that some massive elliptical galaxies remain immature at redshift 4.5 and that these star-forming regions are obscured by dust and gas if the intense bursts of star formation believed to produce the majority of their stellar populations take place during the bright-radio phase.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Star clusters in merging galaxies
Article Abstract:
The merging galaxy pair NGC4038 and NGC4039 contain a large number of super star clusters (SSCs) which may be proto-globular clusters. The Hubble Space Telescope has discovered many such clusters in other galaxies which are merging. Although the SSCs are considered to be of the same age as the galaxy pair, the blue colors and the emission-line nebulae of some SSCs show that clusters are still being formed in NGC4038/4039. The inconsistency in the measurements in the cluster half-life radii is probably because of the crowding effect.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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