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Spatially Resolved Stellar Populations of 0.3 < z < 6.0 Galaxies in WHL 0137–08 and MACS 0647+70 Clusters as Revealed by JWST: How Do Galaxies Grow and Quench over Cosmic Time?

Authors :
Abdurro’uf
Dan Coe
Intae Jung
Henry C. Ferguson
Gabriel Brammer
Kartheik G. Iyer
Larry D. Bradley
Pratika Dayal
Rogier A. Windhorst
Adi Zitrin
Ashish Kumar Meena
Masamune Oguri
Jose M. Diego
Vasily Kokorev
Paola Dimauro
Angela Adamo
Christopher J. Conselice
Brian Welch
Eros Vanzella
Tiger Yu-Yang Hsiao
Xinfeng Xu
Namrata Roy
Celia R. Mulcahey
Source :
The Astrophysical Journal, Vol 945, Iss 2, p 117 (2023)
Publication Year :
2023
Publisher :
IOP Publishing, 2023.

Abstract

We study the spatially resolved stellar populations of 444 galaxies at 0.3 &lt; z &lt; 6.0 in two clusters (WHL 0137–08 and MACS 0647+70) and a blank field, combining imaging data from the Hubble Space Telescope and JWST to perform spatially resolved spectral energy distribution (SED) modeling using piXedfit . The high spatial resolution of the imaging data combined with magnification from gravitational lensing in the cluster fields allows us to resolve a large fraction of our galaxies (109) to subkiloparsec scales. At redshifts around cosmic noon and higher (2.5 ≲ z ≲ 6.0), we find mass-doubling times to be independent of radius, inferred from flat specific star formation rate (sSFR) radial profiles and similarities between the half-mass and half-SFR radii. At lower redshifts (1.5 ≲ z ≲ 2.5), a significant fraction of our star-forming galaxies shows evidence for nuclear starbursts, inferred from a centrally elevated sSFR and a much smaller half-SFR radius compared to the half-mass radius. At later epochs, we find more galaxies suppress star formation in their centers but are still actively forming stars in the disk. Overall, these trends point toward a picture of inside-out galaxy growth consistent with theoretical models and simulations. We also observe a tight relationship between the central mass surface density and global stellar mass with ∼0.38 dex scatter. Our analysis demonstrates the potential of spatially resolved SED analysis with JWST data. Future analysis with larger samples will be able to further explore the assembly of galaxy mass and the growth of their structures.

Details

Language :
English
ISSN :
15384357
Volume :
945
Issue :
2
Database :
Directory of Open Access Journals
Journal :
The Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
edsdoj.68a54c123198430287c00f66c141e47a
Document Type :
article
Full Text :
https://doi.org/10.3847/1538-4357/acba06