Halo occupation distribution (HOD) modelling of high redshift galaxies using the BlueTides simulation

Halo occupation distribution (HOD) modelling of high redshift galaxies using the BlueTides simulation
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使用 BlueTides 模拟对高红移星系进行晕占据分布 (HOD) 建模

DOI:
10.1093/mnras/sty2128
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发表时间:
2018
影响因子:
4.8
通讯作者:
Feng, Yu
Feng, Yu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bhowmick, Aklant K;Campbell, Duncan;Di Matteo, Tiziana;Feng, Yu

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我们利用BlueTides流体动力学模拟软件包构建了M *> 108 M <$h− 1的高红移(107.5)星系的晕占据分布(HOD)模型,重点是模拟小尺度/ 1-晕成团()。类似于低红移的研究,我们发现,中心和卫星的平均HOD(Ncen和Nsat)可以建模的平滑阶跃函数和幂律,分别。然而,与低红移相比,卫星星系的数量密度被显着抑制(卫星分数从0下降到7.5)。在质量低于3 × 1011 M <$h−1的晕中,卫星的平均数量为<$Nsat <$<1(在这些红移下是一种罕见的晕)。在径向数密度剖面上,108 M* 109 M * h − 1的卫星在MH = 3 × 1011 M * h− 1的晕中与NFW(Navarro,Frenk &白色剖面,浓度scsat 10−40)一致。在质量为MH 3 × 1011 M h−1的晕内,卫星呈现出斜率为−3的幂律分布。由于这些晕占主导地位的小规模集群,所产生的1-晕长期是陡峭的比使用标准NFW配置文件预测。使用这种幂律配置文件的卫星,我们可以成功地再现小规模集群所表现出的BlueTidesgalaxies使用HOD建模。我们预测,在大于7.5的情况下,探测到卫星的最高概率是在M * 3 × 1010 M h−1的中心附近(M * 为几个107 M h−1)。这应该可以用詹姆斯·韦伯太空望远镜实现。
We construct halo occupation distribution (HOD) models of high redshift (≳ 7.5) galaxies withM*> 108M⊙h−1using theBlueTideshydrodynamic simulation suite, with a particular emphasis on modelling the small scale / 1-halo clustering (). Similar to low redshift studies, we find that the central and satellite mean HODs (〈Ncen〉 and 〈Nsat〉) can be modelled by a smoothed step function and a power law, respectively. The number density of satellite galaxies is however significantly suppressed compared to low redshift (satellite fractions drop fromat= 0 toat= 7.5). The mean number of satellites 〈Nsat〉 < 1 for halo masses below 3 × 1011M⊙h−1(a rare halo at these redshifts). For the radial number density profiles, satellites with 108≲M*≲ 109M⊙h−1in haloes withMH≳ 3 × 1011M⊙h−1are consistent with NFW (Navarro, Frenk & White profile with concentrationscsat∼ 10−40). Within haloes of massMH≲ 3 × 1011M⊙h−1, satellites exhibit a power-law profile with slope of −3. Because these haloes dominate the small-scale clustering, the resulting 1-halo term is steeper than predicted using standard NFW profiles. Using this power-law profile for satellites, we can successfully reproduce the small-scale clustering exhibited byBlueTidesgalaxies using HOD modelling. We predict the highest probability of detecting satellites at> 7.5 is around centrals ofM*∼ 3 × 1010M⊙h−1(withM* ≳ a few 107M⊙h−1). This should be achievable with theJames Webb Space Telescope.
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