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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1708.07628astro-ph.GAastro-ph.CO
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[ OII ]发射体在0.5

The host dark matter halos of [OII] emitters at 0.5< z< 1.5

V. Gonzalez-Perez, J. Comparat, P. Norberg, C. M. Baugh, S. Contreras, C. Lacey, N. McCullagh, A. Orsi, J. Helly, J. Humphries

摘要:

发射线星系(ELG)被用于几个正在进行和即将进行的调查(SDSS-IV/eBOSS,DESI)作为暗物质分布的示踪剂。使用一个新的星系形成模型,我们探讨[OII]发射器的特点,占主导地位的光学ELG选择在$z\simeq 1$。选择$0.5<z<1.5$的[OII]型发射器模拟DEEP 2、VVDS、eBOSS和DESI勘测。模型[OII]发光体的光度函数与观测值相当吻合。选定的[OII]发射体由具有$M_{\rm halo}\geq 10^{10.3}h^{-1}{\rm M}_{\odot}$的晕所承载,其中约90%是中心恒星形成星系。预测的平均晕占领分布的[OII]发射体具有典型的形状推断的恒星形成的星系,与中央星系的贡献,$\langle N \rangle_{\left[OII\right]\, cen}$,远离典型的阶梯函数。$\langle N \rangle_{\left[OII\right]\, cen}$可以描述为圆盘的非对称高斯和椭球体的阶跃函数之和,其在单位以下稳定。模型[OII]发射器具有接近统一的聚类偏差,低于eBOSS和DESI ELG的预期。在$z\sim 1$,与观测到的g-波段选择星系,预计将占主导地位的[OII]发射器的比较表明,我们的模型产生太少的[OII]发射器是卫星星系。这表明有必要修改我们的卫星星系中热气剥离的模型。

英文摘要:

Emission line galaxies (ELGs) are used in several ongoing and upcoming surveys (SDSS-IV/eBOSS, DESI) as tracers of the dark matter distribution. Using a new galaxy formation model, we explore the characteristics of [OII] emitters, which dominate optical ELG selections at $z\simeq 1$. Model [OII] emitters at $0.5<z<1.5$ are selected to mimic the DEEP2, VVDS, eBOSS and DESI surveys. The luminosity functions of model [OII] emitters are in reasonable agreement with observations. The selected [OII] emitters are hosted by haloes with $M_{\rm halo}\geq 10^{10.3}h^{-1}{\rm M}_{\odot}$, with ~90% of them being central star-forming galaxies. The predicted mean halo occupation distributions of [OII] emitters has a shape typical of that inferred for star-forming galaxies, with the contribution from central galaxies, $\langle N \rangle_{\left[OII\right]\, cen}$, being far from the canonical step function. The $\langle N \rangle_{\left[OII\right]\, cen}$ can be described as the sum of an asymmetric Gaussian for disks and a step function for spheroids, which plateaus below unity. The model [OII] emitters have a clustering bias close to unity, which is below the expectations for eBOSS and DESI ELGs. At $z\sim 1$, a comparison with observed g-band selected galaxy, which are expected to be dominated by [OII] emitters, indicates that our model produces too few [OII] emitters that are satellite galaxies. This suggests the need to revise our modelling of hot gas stripping in satellite galaxies.

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