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

Authors :
Brenda L. Frye
Massimo Pascale
Nicholas Foo
Reagen Leimbach
Nikhil Garuda
Paulina Soto Robles
Jake Summers
Carlos Diaz
Patrick Kamieneski
Lukas J. Furtak
Seth H. Cohen
Jose Diego
Benjamin Beauchesne
Rogier A. Windhorst
S. P. Willner
Anton M. Koekemoer
Adi Zitrin
Gabriel Caminha
Karina I. Caputi
Dan Coe
Christopher J. Conselice
Liang Dai
Hervé Dole
Simon P. Driver
Norman A. Grogin
Kevin Harrington
Rolf A. Jansen
Jean-Paul Kneib
Matt Lehnert
James Lowenthal
Madeline A. Marshall
Felipe Menanteau
Belén Alcalde Pampliega
Nor Pirzkal
Mari Polletta
Johan Richard
Aaron Robotham
Russell E. Ryan Jr.
Michael J. Rutkowski
Christóbal Sifón
Scott Tompkins
Daniel Wang
Haojing Yan
Min S. Yun
Source :
The Astrophysical Journal, Vol 952, Iss 1, p 81 (2023)
Publication Year :
2023
Publisher :
IOP Publishing, 2023.

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) × 10 ^14 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)×10 ^14 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.

Details

Language :
English
ISSN :
15384357
Volume :
952
Issue :
1
Database :
Directory of Open Access Journals
Journal :
The Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
edsdoj.2f68d4688e5a4b3e8d51fca3614c6a4e
Document Type :
article
Full Text :
https://doi.org/10.3847/1538-4357/acd929