麦哲伦FIRE摄谱仪早期IR谱对z~6处普适CIV质量密度的约束
Constraints on the Universal CIV Mass Density at z~6 from Early IR Spectra Obtained with the Magellan FIRE Spectrograph
摘要：
我们提出了一个新的测定星系际CIV质量密度在4.3 < z < 6.3. Our constraints are derived from high signal-to-noise spectra of seven quasars at z >5.8获得与新委托的火摄谱仪的麦哲伦巴德望远镜，再加上六个观测北方物体从文献中。我们确认，在相同的视线下测量，CIV丰度在<z>=5.66处相对于其=4.96处的值下降了4.1倍<z>。在FIRE样本中，先前在文献中报告为z=5.82处的CIV的强系统被重新识别为z=2.78处的MgII，导致这些先前研究的$Ω_{CIV}$大幅向下修订。此外，我们确认存在至少两个系统与低电离CII，SiII和OI吸收，但相对较弱的信号从CIV。如果$Ω_{CIV}$在高红移处的下降趋势部分是由电离效应驱动的，则后一种系统可能是令人感兴趣的。
英文摘要：
We present a new determination of the intergalactic CIV mass density at 4.3 < z < 6.3. Our constraints are derived from high signal-to-noise spectra of seven quasars at z > 5.8 obtained with the newly commissioned FIRE spectrograph on the Magellan Baade telescope, coupled with six observations of northern objects taken from the literature. We confirm the presence of a downturn in the CIV abundance at <z>=5.66 by a factor of 4.1 relative to its value at <z>=4.96, as measured in the same sightlines. In the FIRE sample, a strong system previously reported in the literature as CIV at z=5.82 is re-identified as MgII at z=2.78, leading to a substantial downward revision in $Ω_{CIV}$ for these prior studies. Additionally we confirm the presence of at least two systems with low-ionization CII, SiII, and OI absorption but relatively weak signal from CIV. The latter systems systems may be of interest if the downward trend in $Ω_{CIV}$ at high redshift is driven in part by ionization effects.
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