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The most distant starbursts

机译:最遥远的星暴

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We review the properties of galaxies at z > 5, specifically those selected using the Lyman break technique. We show that these sources are typically young starbursts with relatively dust-free star formation regions. They are resolved on scales of 1 – 2 kpc, sometimes with multiple components seperated by a few kpc. They are smaller than z = 3 Lyman break galaxies (LBGs). As a population, they show no evidence of hosting AGN, obscured or otherwise. Approximately half of the photometrically-selected LBGs at IAB ~ 26 show Ly emission with luminosities of 1042–43 erg s–1. The comoving number density of Lyman break galaxies at z > 5 with M AB(1700?) < –21 is a factor ~ 3 lower than that for similar LBGs at z = 3 – 4. The integrated UV emission from z ~ 5 LBGs brighter than MAB(1700?) < –17.5 is sufficient to ionize their local volume. A similar population at much higher redshift would not be able to keep its local volume ionized.
机译:我们审查了Z> 5的星系的属性,特别是使用Lyman Break技术选择的那些。我们表明这些来源通常是具有相对无尘的星形成区域的年轻爆炸。它们在1 - 2 kPc的尺度上得到了解决,有时有多个组件分开几个kpc。它们小于Z = 3莱曼中断星系(LBG)。作为人口,他们没有显示托管AGN,遮挡或以其他方式的证据。在IAB〜26处的大约一半的基质选择的LBG,显示出亮度为1042-43 erg S-1的发光。 Z> 5的Lyman中断星系的COMOVING数密度(1700?)<-21是比Z = 3 - 4的类似LBG的因子〜3的因子〜3。来自Z〜5 LBG的集成UV发射比mab(1700?)<-17.5足以使其局部体积电离。在更高的红移具有类似的人口将无法将其局部体积保持电离。

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