We report the discovery of seven strongly lensed Lyman break galaxy (LBG) candidates at z~7 detected in Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) imaging of Abell 1703. The brightest candidate, called A1703-zD1, has an observed (lensed) magnitude of 24.0 AB (26 sigma) in the WFC3/IR F160W band, making it 0.2 magnitudes brighter than the z_850-dropout candidate recently reported behind the Bullet Cluster and 0.7 magnitudes brighter than the previously brightest known z~7.6 galaxy, A1689-zD1. With a cluster magnification of ~9, this source has an intrinsic magnitude of H_160 = 26.4 AB, a strong z_850 - J_125 break of 1.7 magnitudes, and a photometric redshift of z~6.7. Additionally, we find six other bright LBG candidates with H_160 band magnitudes of 24.9-26.4, photometric redshifts z~6.4 - 8.8, and magnifications mu~3-40. Stellar population fits to the ACS, WFC3/IR, and \Spitzer/IRAC data for A1703-zD1 and A1703-zD4 yield stellar masses (0.7 - 3.0) x 10^{9} M_sun, stellar ages 5-180 Myr, and star-formation rates ~7.8 M_sun/yr, and low reddening with A_V <= 0.7. The source-plane reconstruction of the exceptionally bright candidate A1703-zD1 exhibits an extended structure, spanning ~4 kpc in the z~6.7 source plane, and shows three resolved star-forming knots of radius r~0.4 kpc.
First Statistical Study of Over 100 Magnified Stellar Events at Redshift $z \approx 0.725$ with JWST
Instituto de Física de Cantabria (CSIC-UC)(坎塔布里亚物理研究所);Center for Astrophysics | Harvard & Smithsonian(哈佛-史密森天体物理中心);Chiba University(千叶大学);Space Telescope Science Institute(太空望远镜科学研究所);University of Arizona(亚利桑那大学);Institute of Science and Technology Austria (ISTA)(奥地利科学与技术研究所);Tsinghua University(清华大学);The University of Hong Kong(香港大学);The Hong Kong Institute for Astronomy and Astrophysics, The University of Hong Kong(香港大学香港天文与天体物理研究所);University of Basque Country UPV/EHU(巴斯克地区大学);Ikerbasque, Basque Foundation for Science(伊卡巴斯基,巴斯克科学基金会)
Supermassive black holes (SMBHs) are a key catalyst of galaxy formation and evolution, leading to an observed correlation between SMBH mass $M_{\rm BH}$ and host galaxy velocity dispersion $σ_{\rm e}$. Outside the local Universe, measurements of $M_{\rm BH}$ are usually only possible for SMBHs in an active state: limiting sample size and introducing selection biases. Gravitational lensing makes it possible to measure the mass of non-active SMBHs. We present models of the $z=0.169$ galaxy-scale strong lens Abell~1201. A cD galaxy in a galaxy cluster, it has sufficient `external shear' that a ma…
First Frontier Field Constraints on the Cosmic Star-Formation Rate Density at z~10 - The Impact of Lensing Shear on Completeness of High-Redshift Galaxy Samples
Kinematic Mapping of Giant Arcs: A New Method to Locate Lensing Critical Curves
University of California, Berkeley(加州大学伯克利分校);Wuhan University(武汉大学);Shanghai Jiao-Tong University(上海交通大学);Fudan University(复旦大学);Berkeley Center for Cosmological Physics, University of California, Berkeley(加州大学伯克利分校伯克利宇宙物理学中心);University of California, Los Angeles(加州大学洛杉矶分校);Instituto de Física de Cantabria (CSIC-UC)(坎塔布里亚物理研究所(西班牙高等科学研究委员会-坎塔布里亚大学));Center for Astrophysics, Harvard & Smithsonian(哈佛史密森天体物理中心);Chiba University(千叶大学)
Source REconstruction of Arcs behind Cluster Halos (SourceREACH): A New Source Reconstruction Algorithm Optimized for Giant Arcs and Galaxy Cluster Lenses
Strongly Lensed Supernovae in Well-Studied Galaxy Clusters with the Vera C. Rubin Observatory
星系团的强透镜效应可以用来显著扩大观测范围,从而可以观测到放大的高红移超新星,否则这些超新星将无法被发现。强透镜效应也可以提供位于星系团后面的星系的多重图像。探测强透镜Ia型超新星(SNe Ia)是特别有用的,因为它们的亮度可以被用来改进星团透镜模型或独立测量宇宙学参数。宇宙学参数,哈勃常数,是特别感兴趣的,因为它的值与不同的方法测量的差异。在这里,我们探讨的可行性,维拉C。Rubin Observatory Legacy Survey of Space and Time(LSST)在五个星系团(Abell 1689和哈勃前沿场星系团)中探测强透镜SNe,这些星系团具有经过充分研究的透镜模型。对5个星系团场中的268幅多重星系像所组成的88个系统进行分析,发现LSST对SNe~Ia(SNe~IIP)爆炸敏感的星系有41(23)幅。这些星系的红移范围在$1.01 < z < 3.05$之间。在其10年的运行期间,LSST预计将探测到$0.2\pm0.1$ SN~Ia和$0.9\pm0.3$堆芯塌陷SN ~ e。然而,由于LSST将观测到更多的大质量星系团,因此期望值可能更高。我们强调的重要性,有一个额外的观测计划的光度和光谱的后续强透镜SNE探测LSST。