4.7 Article

The JWST PEARLS View of the El Gordo Galaxy Cluster and of the Structure It Magnifies

期刊

ASTROPHYSICAL JOURNAL
卷 952, 期 1, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.3847/1538-4357/acd929

关键词

-

向作者/读者索取更多资源

The massive galaxy cluster El Gordo (z = 0.87) produces multiple gravitationally lensed arcs that are captured in images taken by James Webb Space Telescope Near-Infrared Camera (NIRCam). By combining data from the Hubble Space Telescope and NIRCam, new photometric redshifts are obtained, and a lens model based on 56 image multiplicities identifies the two main mass components of the cluster. The study also discovers a new member of a previously known galaxy group at z = 4.32.
The massive galaxy cluster El Gordo (z = 0.87) imprints multitudes of gravitationally lensed arcs onto James Webb Space Telescope Near-Infrared Camera (NIRCam) images. Eight bands of NIRCam imaging were obtained in the Prime Extragalactic Areas for Reionization and Lensing Science (PEARLS) program. Point-spread function-matched photometry across Hubble Space Telescope and NIRCam filters supplies new photometric redshifts. A new light-traces-mass lens model based on 56 image multiplicities identifies the two mass peaks and yields a mass estimate within 500 kpc of (7.0 & PLUSMN; 0.30) x 10(14) M (& ODOT;). A search for substructure in the 140 cluster members with spectroscopic redshifts confirms the two main mass components. The southeastern mass peak that contains the brightest cluster galaxy is more tightly bound than the northwestern one. The virial mass within 1.7 Mpc is (5.1 & PLUSMN; 0.60)x10(14) M (& ODOT;), lower than the lensing mass. A significant transverse velocity component could mean the virial mass is underestimated. We contribute one new member to the previously known z = 4.32 galaxy group. Intrinsic (delensed) positions of the five secure group members span a physical extent of & SIM;60 kpc. 13 additional candidates selected by spectroscopic/photometric constraints are small and faint, with a mean intrinsic luminosity & SIM;2.2 mag fainter than L *. NIRCam imaging admits a fairly wide range of brightnesses and morphologies for the group members, suggesting a more diverse galaxy population in this galaxy overdensity.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据