Preliminary Evidence for Lensing-Induced Alignments of High-Redshift Galaxies in JWST-CEERS
Viraj Pandya, Abraham Loeb, Elizabeth J. McGrath, Guillermo Barro, Steven L. Finkelstein, Henry C. Ferguson, Norman A. Grogin, Jeyhan S. Kartaltepe, Anton M. Ko… 展开作者
Viraj Pandya, Abraham Loeb, Elizabeth J. McGrath, Guillermo Barro, Steven L. Finkelstein, Henry C. Ferguson, Norman A. Grogin, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Casey Papovich, Nor Pirzkal, L. Y. Aaron Yung
备注：
Accepted to ApJ after minor first revision (now includes Monte Carlo uncertainties for galaxy-galaxy lensing shear and analysis of redshift distributions in regions with on-sky galaxy alignments)
The majority of low-mass ($\log_{10} M_*/M_{\odot}=9-10$) galaxies at high redshift ($z>1$) appear elongated in projection. We use JWST-CEERS observations to explore the role of gravitational lensing in this puzzle. The typical galaxy-galaxy lensing shear $γ\sim1\%$ is too low to explain the predominance of elongated early galaxies with ellipticity $e\approx0.6$. However, non-parametric quantile regression with Bayesian Additive Regression Trees reveals hints of an excess of tangentially-aligned source-lens pairs with $γ>10\%$. On larger scales, we also find evidence for weak lensing shear. We rule out the null hypothesis of randomly oriented galaxies at $\gtrsim99\%$ significance in multiple NIRCam chips, modules and pointings. The number of such regions is small and attributable to chance, but coherent alignment patterns suggest otherwise. On the chip scale, the average complex ellipticity $\langle e\rangle\sim10\%$ is non-negligible and beyond the level of our PSF uncertainties. The shear variance $\langle\overlineγ^2\rangle\sim10^{-3}$ is an order of magnitude above the conventional weak lensing regime but is more sensitive to PSF systematics, intrinsic alignments, cosmic variance and other biases. Taking it as an upper limit, the maximum implied ``cosmic shear'' is only a few percent and cannot explain the elongated shapes of early galaxies. The alignments themselves may arise from lensing by a protocluster or filament at $z\sim0.75$ where we find an overabundance of massive lens galaxies. We recommend a weak lensing search for overdensities in ``blank'' deep fields with JWST and the Roman Space Telescope.
Galaxy-scale lens search in the PEARLS NEP TDF and CEERS JWST fields
University of Melbourne（墨尔本大学）；ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D)（三维全天空天体物理学卓越研究中心）；Arizona State University（亚利桑那州立大学）；Instituto de Fisica de Cantabria (CSIC-UC)（坎塔布里亚物理研究所）；Space Telescope Science Institute（太空望远镜科学研究所）
Adding Value to JWST Spectra and Photometry: Stellar Population and Star Formation Properties of Spectroscopically Confirmed JADES and CEERS Galaxies at $z > 7$
本文分析 43 个 JADES/CEERS 经光谱证认的 $z>7$ JWST 星系，联合 SED 拟合、光谱线、测光与形态信息，揭示其上升的恒星形成历史、测光 EW 偏差及近期星暴贡献。
JWST CEERS & JADES Active Galaxies at z = 4-7 Violate the Local $M_\bullet-M_\star$ Relation at $>3σ$: Implications for Low-Mass Black Holes and Seeding Models
A Spectroscopic View of the JWST/GTO Strong Lensing Cluster A1489
我们讨论了一个光谱调查的强透镜集群A1489，其中包括195个集群成员的红移以及188个集群成员的中心速度色散。焦散线技术应用于红移测量给出了动力学参数$M_{200} = (1.25~\pm~0.09) \times 10^{15}~M_\odot$、$r_{200} = 1.97~\pm~{0.05}$ Mpc和$r_{200}$内的星团视线速度色散$1150~\pm~{72}~$ km $~$ s $^{-1}$。这些参数与其他具有较大爱因斯坦半径的强透镜系统的参数非常相似。我们使用光谱学和深测光证明，A1489可能是动态活动的，它的四个BCGs有显着不同的休息帧径向速度。像其他大质量强透镜星系团一样，A1489成员的速度色散函数显示出色散$\geq~250~$ km $~$ s $^{-1}$的过量。中心色散还对未来的透镜模型提供了增强的约束。
An Active Galaxy Cluster Merger at Cosmic Noon Revealed by JWST Weak Lensing and Multiwavelength Probes
Yonsei University（延世大学）；California Institute of Technology（加州理工学院）；University of California Davis（加州大学戴维斯分校）；University of Oxford（牛津大学）；University of California, Los Angeles（加州大学洛杉矶分校）
JWST Discovery of Strong Lensing from a Galaxy Cluster at Cosmic Noon: Giant Arcs and a Highly Concentrated Core of XLSSC 122
California Institute of Technology（加州理工学院）；Yonsei University（延世大学）；University of California, Davis（加州大学戴维斯分校）；Korea Astronomy and Space Science Institute（韩国天体宇宙科学研究所）；University of California, Los Angeles（加州大学洛杉矶分校）
JWST lens model for A370: A very low dark matter fraction for a brightest cluster galaxy and lensing properties for the Dragon arc
Tsinghua University（清华大学）；University of Arizona（亚利桑那大学）；Aix Marseille Univ.（艾克斯-马赛大学）；Cosmic Dawn Center (DAWN)（宇宙黎明中心）；Univ. Grenoble Alpes（格勒诺布尔阿尔卑斯大学）；Oklahoma State University（俄克拉荷马州立大学）；Arizona State University（亚利桑那州立大学）；University of Pennsylvania（宾夕法尼亚大学）；University of Basque Country UPV/EHU（巴斯克地区大学）；Ikerbasque, Basque Foundation for Science（伊克尔巴斯基克科学基金会）；Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）
