7th China-Chile Bilateral Conference for Astronomy

Gravitationally Lensed View of DSFG-1 in PLCK G165.7+49.0: Strong Dust Emission and Spatially Resolved Stellar Population Analysis with JWST and SMA

CC05

Jan 5, 2026, 11:49 AM

12m

Talk CC05: Galaxies, AGNs, Black Holes and Cosmology Contributed talks

Speaker

Ms Zhiyu Yan (CASSACA/NAOC)

Description

We present a detailed stellar population and dust-continuum analysis of the strongly lensed dusty star-forming galaxy (DSFG) PLCK G165.7+49.0 DSFG-1 (the “Emerald”) at z = 2.236, based on JWST NIRCam imaging and Submillimeter Array (SMA) millimeter observations. The system is multiply imaged into two components: image 1a, with a moderate magnification of μ ≈ 3.8, and image 1bc, with an extreme magnification of μ ≈ 34.1. SMA observations reveal exceptionally strong dust-continuum emission in image 1bc, indicative of intense dust-obscured star formation.
We perform both global SED fitting for images 1a and 1bc and spatially resolved SED fitting using Voronoi binning. We further reconstruct the source-plane morphology and conduct source-plane SED modeling to infer the intrinsic dust attenuation, stellar populations, and star formation properties. These analyses reveal the internal structure of dust and stars within the Emerald and demonstrate how strong gravitational lensing enables sub-kiloparsec studies of DSFGs at cosmic noon.