2024/11/28 by Rhythm Shimakawa, Yusei Koyama, Tadayuki Kodama +8 · 1 voice
Physics and Astronomy · #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #Astrophysical Phenomena and Observations
paper · pdf · doi:10.1093/mnrasl/slae098
openalex publication_date 2024/11/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
ABSTRACT Near-infrared (NIR) emission is less affected by dust than ultraviolet and optical emission and is therefore useful for studying the properties of dust-obscured galaxies. Although rest-frame NIR observations of high-redshift galaxies have long been made using space telescopes, their structures were unresolved due to the lack of angular resolution. This letter reports the early results from the analysis of high-resolution Paβ imaging of the Spiderweb protocluster at z=2.16 with the JWST Near Infrared Camera. We investigate radial profiles of Paβ lines and rest-frame NIR continua from luminous H α-emitting galaxies (HAEs) in the protocluster. Particularly, we compare those of 11 HAEs (N-HAEs) on the star-forming main sequence with those of 8 HAEs (X-HAEs) with X-ray active galactic nuclei (AGNs). Resultant composite Paβ line images of N-HAEs indicate significant star formation in galactic discs. In contrast, X-HAEs are dominated by point source components rather than outer star formation, as inferred from our earlier work based on multiwavelength spectral energy distribution fitting. Given their higher stellar potentials suggested from their rest-frame NIR images, the different characteristics may be driven by the impact of AGN feedback.