Author ORCID Identifier
Brenda L. Frye: 0000-0003-1625-8009
Massimo Pascale: 0000-0002-2282-8795
Nicholas Foo: 0000-0002-7460-8460
Reagen Leimbach: 0009-0001-7446-2350
Nikhil Garuda: 0000-0003-3418-2482
Jake Summers: 0000-0002-7265-7920
Patrick Kamieneski: 0000-0001-9394-6732
Lukas J. Furtak: 0000-0001-6278-032X
Seth H. Cohen: 0000-0003-3329-1337
Jose Diego: 0000-0001-9065-3926
Benjamin Beauchesne: 0000-0002-0443-6018
Rogier A. Windhorst: 0000-0001-8156-6281
Anton M. Koekemoer: 0000-0002-6610-2048
Adi Zitrin: 0000-0002-0350-4488
Gabriel Caminha: 0000-0001-6052-3274
Karina I. Caputi: 0000-0001-8183-1460
Dan Coe: 0000-0001-7410-7669
Christopher J. Conselice: 0000-0003-1949-7638
Liang Dai: 0000-0003-2091-8946
Hervé Dole: 0000-0002-9767-3839
Simon P. Driver: 0000-0001-9491-7327
Norman A. Grogin: 0000-0001-9440-8872
Kevin Harrington: 0000-0001-5429-5762
Rolf A. Jansen: 0000-0003-1268-5230
Jean Paul Kneib: 0000-0002-4616-4989
James Lowenthal: 0000-0001-9969-3115
Madeline A. Marshall: 0000-0001-6434-7845
Felipe Menanteau: 0000-0002-1372-2534
Document Type
Article
Publication Date
7-1-2023
Publication Title
Astrophysical Journal
Abstract
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 ± 0.30) × 1014 M ⊙. 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 ± 0.60)×1014 M ⊙, 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 ∼60 kpc. 13 additional candidates selected by spectroscopic/photometric constraints are small and faint, with a mean intrinsic luminosity ∼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.
Volume
952
Issue
1
DOI
10.3847/1538-4357/acd929
ISSN
0004637X
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Frye, Brenda L.; Pascale, Massimo; Foo, Nicholas; Leimbach, Reagen; Garuda, Nikhil; Robles, Paulina Soto; Summers, Jake; Diaz, Carlos; Kamieneski, Patrick; Furtak, Lukas J.; Cohen, Seth H.; Diego, Jose; Beauchesne, Benjamin; Windhorst, Rogier A.; Willner, S. P.; Koekemoer, Anton M.; Zitrin, Adi; Caminha, Gabriel; Caputi, Karina I.; Coe, Dan; Conselice, Christopher J.; Dai, Liang; Dole, Hervé; Driver, Simon P.; Grogin, Norman A.; Harrington, Kevin; Jansen, Rolf A.; Kneib, Jean Paul; Lehnert, Matt; Lowenthal, James; Marshall, Madeline A.; and Menanteau, Felipe, "The JWST PEARLS View of the El Gordo Galaxy Cluster and of the Structure It Magnifies" (2023). Astronomy: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/ast_facpubs/136
Comments
Archived as published.