The VLT LBG Redshift Survey I: Clustering and Dynamics of ~1000 Galaxies at z~3
Rich Bielby, T. Shanks, P. M. Weilbacher, L. Infante, N. H. M. Crighton, Carlos Bornancini, N. Bouché, P. Héraudeau, D. G. Lambas, J. Lowenthal, D. Minniti, N. … 展开作者
Rich Bielby, T. Shanks, P. M. Weilbacher, L. Infante, N. H. M. Crighton, Carlos Bornancini, N. Bouché, P. Héraudeau, D. G. Lambas, J. Lowenthal, D. Minniti, N. Padilla, P. Petitjean, T. Theuns
We present the initial imaging and spectroscopic data acquired as part of the VLT VIMOS Lyman-break galaxy Survey. UBR (or UBVI) imaging covers five 36'x36' fields centred on bright z>3 QSOs, allowing ~21,000 2<z<3.5 galaxy candidates to be selected using the Lyman-break technique. We performed spectroscopic follow-up using VIMOS, measuring redshifts for 1020 z>2 LBGs and 10 z>2 QSOs from a total of 19 VIMOS pointings. From the galaxy spectra, we observe a 625+-510 km/s velocity offset between the ISM absorption and Ly-alpha emission line redshifts. Using the photometric and spectroscopic catalogues, we have analysed the galaxy clustering at z~3. In the photometric case, the angular correlation function, w(theta), is well fit by a double power-law with clustering scale-length, r_0 = 3.19+0.32-0.54 Mpc/h for r < 1 Mpc/h and r_0 = 4.59+0.31-0.33 Mpc/h at larger scales. Using the redshift sample we estimate the semi-projected correlation function, w_p(sigma) and find r_0 = 3.67+0.23-0.24 Mpc/h for the VLT sample and r_0 = 3.98+0.14-0.15 Mpc/h for a combined VLT+Keck sample. From the z-space correlation functions and assuming the above xi(r) models, we find that the combined VLT and Keck surveys require a galaxy velocity dispersion, <w_z^2>^1/2 ~ 700 km/s, higher than the ~400 km/s found by previous authors. We also measure a value for the gravitational growth rate parameter of beta(z=3) = 0.48+-0.17, implying a low value for the bias of b = 2.06+1.1-0.5. This value is consistent with the galaxy clustering amplitude which gives b = 2.22+-0.16, assuming the standard cosmology, implying that the evolution of the gravitational growth rate is also consistent with Einstein gravity. We have compared our LBG clustering amplitudes with lower redshift measurements and find that the clustering strength is not inconsistent with that of low-redshift L* spirals for simple 'long-lived' galaxy models.
Spectroscopic confirmation of z~7 LBGs: probing the earliest galaxies and the epoch of reionization
我们在ESO/VLT上展示了FORS 2超深光谱活动的最终结果,以确认从我们的VLT/Hawk-I成像调查中选择的三个独立领域的z~7“z-波段脱落”候选者。我们特别报道了在NTT深场中新发现的两个红移约为6.7的星系:这两个星系都显示出Ly-alpha发射线,其静止坐标系EW为15-20 A量级,光度为2-4 X 10^{42} erg/s。我们还提出了一个样本的i-dropout星系的超深观测的结果,从中我们设置了一个坚实的上限的分数的闯入者。在观察到的20个z-dropout中,我们确认了5个星系在6.7 < z < 7.1。这系统地低于根据较低红移观测得出的预期:特别是有一个显着缺乏对象与中间Ly-alpha EW(20和55 A之间)。我们的结论是LBG中Ly-alpha发射的分数从z~3到z~6不断增加的趋势很可能从z~6到z~7反转。解释观测到的LAE分数在辍学人口与再电离之间的快速变化需要一个快速演变的中性部分的氢在宇宙中。假设宇宙在z=6时完全电离,并采用Dijkstra et al.(2011)的半解析模型,我们发现我们的数据要求中性氢分数在时间Δ z ~ 1内发生Δ chi_{HI} ~ 0.6量级的变化,前提是逃逸分数在相同的红移间隔内没有显著增加。
Assessing the large-scale angular clustering of UNIONS Lyman Break Galaxies via cross-correlations
IRFU, CEA, Université Paris-Saclay(法国原子能和替代能源委员会巴黎萨克雷大学研究部);IFAE, The Barcelona Institute of Science and Technology(巴塞罗那科学与技术研究所高能物理分院);Ruhr University Bochum(鲁尔大学波鸿分校);Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM(巴黎萨克雷大学、巴黎西岱大学、法国原子能和替代能源委员会、法国国家科学研究中心天体物理学与成像模拟实验室);Institute for Astronomy, University of Hawaii(夏威夷大学天文学研究所);Department of Physics and Astronomy, University of British Columbia(不列颠哥伦比亚大学物理与天文系);Department of Physics and Atmospheric Science, Dalhousie University(达尔豪斯大学物理与大气科学系);Department of Physics and Astronomy, University of Waterloo(滑铁卢大学物理与天文系);Waterloo Centre for Astrophysics, University of Waterloo(滑铁卢大学滑铁卢天体物理中心);Perimeter Institute for Theoretical Physics(珀因特理论物理研究所);National Research Council Herzberg Astronomy and Astrophysics(加拿大国家研究委员会赫尔伯格天体物理学与天文学)
Evolution of Stellar-to-Halo Mass Ratio at z=0-7 Identified by Clustering Analysis with the Hubble Legacy Imaging and Early Subaru/Hyper Suprime-Cam Survey Data
Comparison of the VIMOS-VLT Deep Survey with the Munich semi-analytical model - I. Magnitude counts, redshift distribution, colour bimodality, and galaxy clustering
Forecasting local Primordial Non-Gaussianities from UNIONS Lyman-Break Galaxies and Planck CMB lensing
University of Waterloo(滑铁卢大学);University of British Columbia(不列颠哥伦比亚大学);Université Paris-Saclay(巴黎萨克雷大学);The Barcelona Institute of Science and Technology(巴塞罗那科学技术学院);Ruhr University Bochum(波鸿鲁尔大学);Perimeter Institute for Theoretical Physics(理论物理珀米特研究所);University of Hawaii(夏威夷大学);National Research Council Herzberg Astronomy and Astrophysics(国家研究委员会赫尔茨伯格天文学与天体物理学研究所)
We present bright [CII] 158 $μ$m line detections from a strongly magnified and multiply-imaged ($μ\sim20-160$) sub-$L^{*}$ ($M_{\rm UV}$ = $-19.75^{+0.55}_{-0.44}$) Lyman-break galaxy (LBG) at $z=6.0719\pm0.0004$ from the ALMA Lensing Cluster Survey (ALCS). Emission lines are identified at 268.7 GHz at $\geq$ 8$σ$ exactly at positions of two multiple images of the LBG behind the massive galaxy cluster RXCJ0600$-$2007. Our lens models, updated with the latest spectroscopy from VLT/MUSE, indicate that a sub region of the LBG crosses the caustic and is lensed into a long ($\sim6''$) arc with a lo…
Measurement of Galaxy Clustering at z~7.2 and the Evolution of Galaxy Bias from 3.8<z<8 in the XDF, GOODS-S AND GOODS-N
在再电离($z\gtrsim6$)期间用哈勃太空望远镜的宽视场相机3观察到的莱曼-布雷克星系(LBG)样本达到了足以表征其聚类特性的大小。使用哈勃极深场和坎德尔巡天的组合星表,包含z>6.5的$N=743$ LBG候选者,平均红移为$z=7.2$,我们在$\sim4σ$的角相关函数(ACF)中检测到清晰的聚类信号,对应于实空间相关长度$r_{0}=6.7^{+0.9}_{-1.0}h^{-1}$ cMpc。导出的星系偏差$b=8.6^{+0.9}_{-1.0}$是$z=7.2$的$M=10^{11.1^{+0.2}_{-0.3}}$ M $_{\odot}$的暗物质晕,并强调低于当前检测限($M_{AB}\sim-17.7$)的星系预计在较低质量的晕($M\sim10^{8}-10^{10.5}$ M $_{\odot}$)。我们计算ACF的LBG在$z\sim3.8-z\sim5.9$在相同的调查。从$z=3.8$($b\sim3.0$)到$z=7.2$($b\sim8.6$),发现了一个偏差增加的趋势,这与在$4<z<6$的类似质量的暗物质晕中托管的固定光度的星系大致一致,随后在$z\sim7$的晕质量略有上升($\sim2σ$置信度)。在$z=7.2$样本($M_{UV}=-19.4$)的中等光度下分离数据显示,与暗淡星系($r_{0}=1.9^{+1.1}_{-1.0}h^…
Keck Spectroscopy of Faint 3<z<7 Lyman Break Galaxies: - I. New constraints on cosmic reionisation from the luminosity and redshift-dependent fraction of Lyman-alpha emission
A Large Number of z > 6 Galaxies around a QSO at z = 6.43: Evidence for a Protocluster?
类星体被认为对追踪早期宇宙中高度偏差的区域很重要,今天的大质量星系和星系团就是从这些区域形成的。虽然在2<z<5的类星体周围已经发现了恒星形成星系的过密度,但在z>6的类星体周围是否有多余的星系聚集还不太清楚。以前的研究与HST报告的检测微弱的辍学星系在一些类星体领域的小过剩,但这些调查探讨了一个相对较小的区域周围的类星体。为了克服这个问题,我们使用Suprime-Cam的大视场(34' x 27')观测了z=6.4的最远类星体。新安装的CCD使我们能够更有效地选择z~6.4的莱曼破裂星系(LBG)。在类星体场中我们发现了七个LBG,而在比较场中只有一个LBG。如果没有光谱学的确认和额外的控制场,这种明显过量的重要性很难量化。当预期有4个天体时,发现7个天体的泊松概率约为10%,而在一个区域发现7个天体而在另一个区域只发现1个天体的概率小于0.4%,这表明类星体区域相对于控制区域来说是明显过密的。我们发现一些证据表明,LBG在类星体中心的环状分布,半径约为3 Mpc。在距离类星体2 Mpc的范围内没有候选LBG,即,星系聚集在类星体周围,但似乎避开了正中心。这些结果表明,类星体是嵌入在一个过密的区域时,定义在一个足够大的规模。这表明类星体确实诞生在一个巨大的光环中。星系的中心亏损可能表明:(1)来自类星体的强紫外辐射抑制了其附近的星系形成,或者(2)离类星体最近的恒星形成大多发生在…
We report the first detection of the dark matter distribution around Lyman break galaxies (LBGs) at high redshift through the Cosmic Microwave Background (CMB) lensing measurements with the public {\it Planck} PR3 $κ$ map. The LBG sample consists of 1,473,106 objects with the median redshift of $z \sim 4$ that are identified in a total area of 305 deg$^2$ observed by the Hyper Suprime-Cam (HSC) Strategic Survey Program (SSP) survey. After careful investigations of systematic uncertainties, such as contamination from foreground galaxies and Cosmic Infrared Background (CIB), we obtain the signif…
The Galaxy--Halo Connection in High-Redshift Universe: Details and Evolution of Stellar-to-Halo Mass Ratios of Lyman Break Galaxies on CFHTLS Deep Fields
We explore the connection between the stellar component of galaxies and their host halos during the epoch of reionization ($5 \leq z\leq10$) using the CROC (Cosmic Reionization on Computers) simulations. We compare simulated galaxies with observations and find that CROC underpredicts the abundance of luminous galaxies when compared to observed UV luminosity functions, and analogously the most massive galaxies when compared to observed stellar mass functions. We can trace the deficit of star formation to high redshifts, where the slope of the star formation rate to stellar mass relation is cons…
Lyman-Alpha Forest and its Cross-Correlation with High-Redshift Galaxies in Effective Field Theory at the Field Level
Center for Theoretical Physics – a Leinweber Institute, Massachusetts Institute of Technology(麻省理工学院理论物理中心);The NSF AI Institute for Artificial Intelligence and Fundamental Interactions(美国国家科学基金会人工智能基础相互作用研究所);Department of Physics, Columbia University(哥伦比亚大学物理系);NASA Hubble Fellowship Program(NASA 哈勃奖学金计划);Theory Center, Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK)(高能加速器研究机构粒子与核研究学院理论中心)