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

Authors

Brenda L. Frye, The University of Arizona
Massimo Pascale, University of California, Berkeley
Nicholas Foo, The University of Arizona
Reagen Leimbach, The University of Arizona
Nikhil Garuda, The University of Arizona
Paulina Soto Robles, The University of Arizona
Jake Summers, School of Earth and Space Exploration
Carlos Diaz, University of Massachusetts Amherst
Patrick Kamieneski, School of Earth and Space Exploration
Lukas J. Furtak, Ben-Gurion University of the Negev
Seth H. Cohen, School of Earth and Space Exploration
Jose Diego, CSIC-UC - Instituto de Física de Cantabria (IFCA)
Benjamin Beauchesne, École Polytechnique Fédérale de Lausanne
Rogier A. Windhorst, School of Earth and Space Exploration
S. P. Willner, Harvard-Smithsonian Center for Astrophysics
Anton M. Koekemoer, Space Telescope Science Institute
Adi Zitrin, Ben-Gurion University of the Negev
Gabriel Caminha, Max Planck Institute for Astrophysics
Karina I. Caputi, Kapteyn Instituut
Dan Coe, Space Telescope Science Institute
Christopher J. Conselice, The University of Manchester
Liang Dai, University of California, Berkeley
Hervé Dole, Institut d'Astrophysique Spatiale
Simon P. Driver, The University of Western Australia
Norman A. Grogin, Space Telescope Science Institute
Kevin Harrington, European Southern Observatory Santiago
Rolf A. Jansen, School of Earth and Space Exploration
Jean Paul Kneib, École Polytechnique Fédérale de Lausanne
Matt Lehnert, École Normale Supérieure de Lyon
James Lowenthal, Smith CollegeFollow
Madeline A. Marshall, National Research Council Canada
Felipe Menanteau, University of Illinois Urbana-Champaign

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.

Comments

Archived as published.

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