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arXiv 1503.00004astro-ph.GA
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H $β$ +[ OIII ]和[ OII ]光度函数的演化和从HiZELS到$z$ ~ 5的宇宙[ OII ]恒星形成历史

Evolution of the H$β$+[OIII] and [OII] luminosity functions and the [OII] star-formation history of the Universe up to $z$ ~ 5 from HiZELS

Ali Ahmad Khostovan, David Sobral, Bahram Mobasher, Philip N. Best, Ian Smail, John P. Stott, Shoubaneh Hemmati, Hooshang Nayyeri

摘要:

利用高{ \it z}发射谱线巡天(HiZELS)的数据,我们研究了H $β$ +[OIII]和[OII]光度函数从$z \sim 0.8$到$\sim5$的演化.这是第一次,H $β$ +[OIII]和[OII]的光度函数已被研究在这些红移的自洽分析。这也是在这个红移范围内最大的[OII]和H $β$ +[OIII]发射体(分别为3475和3298发射体)的样本,在两个独立的体积(COSMOS和UDS)中具有大的共同移动体积$\sim 1 \times 10^6$ Mpc $^{-3}$,大大降低了宇宙方差的影响。发射体的选择是通过光度红移和颜色-颜色选择的组合,以及光谱跟踪,包括最近使用凯克望远镜上的DEIMOS和MOSFIRE以及斯巴鲁上的FMOS进行的光谱观测。我们发现对于H $β$ +[OIII]和[OII]发射体,$L_\star$强烈增加,而$ϕ_\star$减少。我们推导了自$z\sim5$以来宇宙的[OII]恒星形成历史,发现宇宙SFRD从$z \sim 5$上升到$\sim 3$,然后下降到$z \sim 0$。我们还发现,我们的恒星形成的历史是能够再现的恒星质量密度的演变$z\sim 5$仅基于一个单一的示踪剂的恒星形成。当比较H $β$ +[OIII] SFRD与文献中的[OII]和H $α$ SFRD测量值时,我们发现有一个显著的一致性,表明H $β$ +[OIII]样品在高$z$时主要是由恒星形成星系而不是活动星系。

英文摘要:

We investigate the evolution of the H$β$+[OIII] and [OII] luminosity functions from $z \sim 0.8$ to $\sim5$ in four redshift slices per emission line using data from the High-{\it z} Emission Line Survey (HiZELS). This is the first time that the H$β$+[OIII] and [OII] luminosity functions have been studied at these redshifts in a self-consistent analysis. This is also the largest sample of [OII] and H$β$+[OIII] emitters (3475 and 3298 emitters, respectively) in this redshift range, with large co-moving volumes $\sim 1 \times 10^6$ Mpc$^{-3}$ in two independent volumes (COSMOS and UDS), greatly reducing the effects of cosmic variance. The emitters were selected by a combination of photometric redshift and color-color selections, as well as spectroscopic follow-up, including recent spectroscopic observations using DEIMOS and MOSFIRE on the Keck Telescopes and FMOS on Subaru. We find a strong increase in $L_\star$ and a decrease in $ϕ_\star$ for both H$β$+[OIII] and [OII] emitters. We derive the [OII] star-formation history of the Universe since $z\sim5$ and find that the cosmic SFRD rises from $z \sim 5$ to $\sim 3$ and then drops towards $z \sim 0$. We also find that our star-formation history is able to reproduce the evolution of the stellar mass density up to $z\sim 5$ based only on a single tracer of star-formation. When comparing the H$β$+[OIII] SFRDs to the [OII] and H$α$ SFRD measurements in the literature, we find that there is a remarkable agreement, suggesting that the H$β$+[OIII] sample is dominated by star-forming galaxies at high-$z$ rather than AGNs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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