Star formation at the epoch of reionization with CANUCS

ǂthe ǂages of stellar populations in MACS1149-JD1

Maruša Bradač (Author), Victoria Strait (Author), Lamiya Mowla (Author), Kartheik G. Iyer (Author), Gaël Noirot (Author), Chris J. Willott (Author), Anishya Harshan Thevalil (Author), Nicholas S. Martis (Author), Gregor Rihtaršič (Author)

Abstract

We present measurements of stellar populations properties of a $z$ = 9.1 gravitationally lensed galaxy MACS1149-JD1 using deep James Webb Space Telescope NIRISS slitless spectroscopy as well as NIRISS and NIRCam imaging from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). The galaxy is split into four components. Three magnified ($μ$ ∼ 11) star-forming components are unresolved, giving intrinsic sizes of < 25 pc. In addition, the underlying extended component contains the bulk of the stellar mass, formed the majority of its stars ∼50 Myr earlier than the other three components, and is not the site of the most active star formation currently. The NIRISS and NIRCam resolved photometry does not confirm a strong Balmer break previously seen in Spitzer. The NIRISS grism spectrum has been extracted for the entire galaxy and shows a clear continuum and Lyman break, with no Ly$α$ detected.

Keywords

high-redshift galaxies;gravitational lensing;reionization;

Data

Language:	English
Year of publishing:	2024
Typology:	1.01 - Original Scientific Article
Organization:	UL FMF - Faculty of Mathematics and Physics
UDC:	524.8
COBISS:	182919427
ISSN:	2041-8213
Views:	1096
Downloads:	164
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