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Evidence for a Gradual Decline in the Universal Rest-Frame Ultraviolet Luminosity Density for z < 1

机译:z <1时的通用静止框架紫外线光密度逐渐下降的证据

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We have utilized various magnitude-limited samples drawn from an extremely deep and highly complete spectroscopic redshift survey of galaxies observed in seven colors in the Hawaii Survey Fields and the Hubble Deep Field to investigate the evolution of the universal rest-frame ultraviolet luminosity density from z = 1 to the present. The multicolor data (U', B, V, R, and I, J, HK') enable the sample selection to be made in the rest-frame ultraviolet for the entire redshift range. Because of the large sample size and depth (UAB = 24.75, BAB = 24.75, IAB = 23.5), we are able to accurately determine the luminosity density to z = 1. We do not confirm the very steep evolution reported by Lilly et al. but instead find a shallower slope, approximately (1 + z)1.5 for q0 = 0.5, which would imply that galaxy formation is continuing smoothly to the present time rather than peaking at z = 1. Much of the present formation is taking place in smaller galaxies. Detailed comparisons with other recent determinations of the evolution are presented.
机译:我们利用了各种幅度有限的样本,这些样本是从在夏威夷调查场和哈勃深场中以七种颜色观察到的极深和高度完整的光谱红移星系调查中得出的,以研究z轴上通用静止框架紫外线光度密度的演变。 = 1到现在。多色数据(U',B,V,R和I,J,HK')可在整个红移范围的其余帧紫外线下进行样品选择。由于样本量大且深度大(UAB = 24.75,BAB = 24.75,IAB = 23.5),我们能够准确确定z = 1的光度密度。我们无法确定Lilly等人报道的非常陡峭的变化。但取而代之的是找到一个较浅的斜率,对于q0 = 0.5大约为(1 + z)1.5,这意味着星系的形成一直持续到目前,而不是在z = 1达到峰值。星系。提出了与其他最近确定的进化的详细比较。

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