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TEMPLATES: Characterization of a Merger in the Dusty Lensing SPT0418–47 System

Cathey, Jared; Gonzalez, Anthony H.; Lower, Sidney; Phadke, Kedar A.; Spilker, Justin; Aravena, Manuel; Bayliss, Matthew; Birkin, Jack E.; Birrer, Simon; Chapman, Scott; Dahle, Håkon; Hayward, Christopher C.; Hezaveh, Yashar; Hill, Ryley; Hutchison, Taylor A.; Kim, Keunho J.; Mahler, Guillaume; Marrone, Daniel P.; Narayanan, Desika; Navarre, Alexander; Reuter, Cassie; Rigby, Jane R.; Sharon, Keren; Solimano, Manuel; Sulzenauer, Nikolaus; Vieira, Joaquin; Vizgan, David

TEMPLATES: Characterization of a Merger in the Dusty Lensing SPT0418–47 System Thumbnail


Authors

Jared Cathey

Anthony H. Gonzalez

Sidney Lower

Kedar A. Phadke

Justin Spilker

Manuel Aravena

Matthew Bayliss

Jack E. Birkin

Simon Birrer

Scott Chapman

Håkon Dahle

Christopher C. Hayward

Yashar Hezaveh

Ryley Hill

Taylor A. Hutchison

Keunho J. Kim

Daniel P. Marrone

Desika Narayanan

Alexander Navarre

Cassie Reuter

Jane R. Rigby

Keren Sharon

Manuel Solimano

Nikolaus Sulzenauer

Joaquin Vieira

David Vizgan



Abstract

We present JWST and Atacama Large Millimeter/submillimeter Array (ALMA) imaging for the lensing system SPT0418−47, which includes a strongly lensed, dusty, star-forming galaxy at redshift z = 4.225 and an associated multiply imaged companion. The JWST NIRCam and MIRI imaging observations presented in this paper were acquired as part of the Early Release Science program Targeting Extremely Magnified Panchromatic Lensed Arcs and Their Extended Star formation (TEMPLATES). This data set provides robust mutiwavelength detections of stellar light in both the main (SPT0418A) and companion (SPT0418B) galaxies, while the ALMA detection of [C ii] emission confirms that SPT0418B lies at the same redshift as SPT0418A. We infer that the projected physical separation of the two galaxies is 4.42 ± 0.05 kpc. We derive total magnifications of μ = 29 ± 1 and μ = 4.1 ± 0.7 for SPT0418A and SPT0418B, respectively. We use both prospector and cigale to derive stellar masses. We find that SPT0418A has a stellar mass of M*=3.4−0.6+1.1×1010M⊙ from prospector or M * = 1.5 ± 0.3 × 1010 M ⊙ from cigale. The stellar mass ratio of SPT0418A and SPT0418B is roughly between 4 and 7 ( 4.2−1.6+1.9 for prospector and 7.5 ± 3.7 for cigale). We see evidence of extended structure associated with SPT0418A that is suggestive of a tidal feature. These features, along with the close projected proximity, imply that the system is interacting. Interestingly, the star formation rates and stellar masses of both galaxies are consistent with the main sequence of star-forming galaxies at this epoch, indicating that this ongoing interaction has not noticeably elevated the star formation levels.

Citation

Cathey, J., Gonzalez, A. H., Lower, S., Phadke, K. A., Spilker, J., Aravena, M., …Vizgan, D. (2024). TEMPLATES: Characterization of a Merger in the Dusty Lensing SPT0418–47 System. Astrophysical Journal, 967(1), Article 11. https://doi.org/10.3847/1538-4357/ad33c9

Journal Article Type Article
Acceptance Date Feb 16, 2024
Online Publication Date May 13, 2024
Publication Date May 1, 2024
Deposit Date May 21, 2024
Publicly Available Date May 21, 2024
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 967
Issue 1
Article Number 11
DOI https://doi.org/10.3847/1538-4357/ad33c9
Keywords Galaxy mergers, Einstein rings, Strong gravitational lensing, High-redshift galaxies
Public URL https://durham-repository.worktribe.com/output/2453406

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