Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey
Narrow C IV absorption doublets on quasar spectra of the Baryon Oscillation Spectroscopic Survey
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重子振荡光谱巡天类星体光谱上的窄 C IV 吸收双峰
DOI：
10.1093/mnras/stw1872
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发表时间：
2016-08
影响因子：
4.8
通讯作者：
Chen Yan-Mei
中科院分区：
文献类型：
--
作者：
Chen Zhi-Fu;Gu Qiu-Sheng;Zhou Luwenjia;Chen Yan-Mei
本文扩展了我们在重子振荡光谱巡天（BOSS）类星体谱上系统地观测到的具有\zabs$\ll$\zem\的\CIVab\窄吸收线（NAL）的工作，收集了具有\zabs$\approx$\zem\的CIV\NAL，从蓝色到红色的CIV波发射线的两翼。连同论文I和II，我们总共收集了41，479个\CIV\NAL，在\Lya\的测量光谱区域内，直到\CIV波\发射线的红翼，其值为1.4544\le\zabs$\le4.9224 $。我们发现，较强的\CIV\ NALS往往是更饱和的吸收，相关系统（\zabs$\approx$\zem）似乎有更大的吸收强度相比，干预的（\zabs$\ll$\zem）。吸收体的红移密度演化行为（每条红移路径上吸收体的数量）与宇宙星星形成的历史相似。当比较类星体的帧速度（$\beta$）分布的\MgII\吸收剂，$\beta$分布的\CIV\吸收剂是更广泛的在$\beta\approx 0 $，显示更长的延长尾巴，并表现出更大的分散环境反射。此外，对于相关的CIV吸收体，我们发现，低光度类星体似乎表现出更小的$\beta$和更强的反射时相比，高光度类星体。
In this paper, we extend our works of Papers I and II, which are assigned to systematically survey \CIVab\ narrow absorption lines (NALs) with \zabs$\ll$\zem\ on quasar spectra of the Baryon Oscillation Spectroscopic Survey (BOSS), to collect \CIV\ NALs with \zabs$\approx$\zem\ from blue to red wings of \CIVwave\ emission lines. Together with Papers I and II, we have collected a total number of 41,479 \CIV\ NALs with $1.4544\le$\zabs$\le4.9224$ in surveyed spectral region redward of \lya\ until red wing of \CIVwave\ emission line. We find that the stronger \CIV\ NALs tend to be the more saturated absorptions, and associated systems (\zabs$\approx$\zem) seem to have larger absorption strengths when compared to intervening ones (\zabs$\ll$\zem). The redshift density evolution behavior of absorbers (the number of absorbers per redshift path) is similar to the history of the cosmic star formation. When compared to the quasar-frame velocity ($\beta$) distribution of \MgII\ absorbers, the $\beta$ distribution of \CIV\ absorbers is broader at $\beta\approx0$, shows longer extended tail, and exhibits a larger dispersion for environmental absorptions. In addition, for associated \CIV\ absorbers, we find that low-luminosity quasars seem to exhibit smaller $\beta$ and stronger absorptions when compared to high-luminosity quasars.
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DOI：
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发表时间：
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影响因子：
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作者：
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