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The formation of cluster elliptical galaxies as revealed by extensive star formation

机译：广泛的恒星形成揭示了簇状椭圆星系的形成

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The most massive galaxies in the present-day Universe are found to lie in the centres of rich clusters. They have old, coeval stellar populations suggesting that the bulk of their stars must have formed at early epochs in spectacular starbursts, which should be luminous phenomena when observed at submillimetre wavelengths. The most popular model of galaxy formation predicts that these galaxies form in proto-clusters at high-density peaks in the early Universe. Such peaks are indicated by massive high-redshift radio galaxies. Here we report deep submillimetre mapping of seven high-redshift radio galaxies and their environments. These data confirm not only the presence of spatially extended regions of massive star-formation activity in the radio galaxies themselves, but also in companion objects previously undetected at any wavelength. The prevalence, orientation, and inferred masses of these submillimetre companion galaxies suggest that we are witnessing the synchronous formation of the most luminous elliptical galaxies found today at the centres of rich clusters of galaxies.
机译：发现当今宇宙中最庞大的星系位于富星团的中心。他们拥有古老的，近代的恒星种群，这表明它们的大部分恒星一定是在壮观的爆炸中的早期形成的，当在亚毫米波长观察时，这应该是发光现象。最流行的星系形成模型预测，这些星系在宇宙早期的高密度峰值的原始团簇中形成。巨大的高红移射电星系表明了这些峰值。在这里，我们报告了七个高红移无线电星系及其环境的深亚毫米级映射。这些数据不仅证实了射电星系本身中大质量恒星形成活动的空间扩展区域的存在，而且证实了以前在任何波长下都未发现的伴星。这些亚毫米级伴星系的流行，方向和推断质量表明，我们正在目睹当今在发光丰富的星系团中心发现的最发光的椭圆形星系的同步形成。

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