Poster Presentation

Environmental Dependence of High Redshift Galaxies Traced by JWST Pure-Parallel Imaging Program BEACON

Author(s): Ryo Albert Sutanto (Tohoku University), Tadayuki Kodama (Tohoku University), Takahiro Morishita (California Institute of Technology)

Presenter: Ryo Albert Sutanto (Tohoku Unviersity)

We present results from the BEACON survey, a JWST Cycle 2 pure-parallel NIRCam program covering ~200 arcmin², designed for an unbiased search for galaxy overdensities at z≈2-5. Using Weighted Adaptive Kernel Density Estimation (wKDE), we identify overdensity candidates with minimal impact from cosmic variance—an advantage of our pure-parallel strategy.
We investigate differences in galaxy properties and morphologies between overdense regions and field. We also dive into a particular focus on identifying Dusty Star-Forming Galaxies (DSFGs) developed by our NIRCam color–color selection based on basic galaxy SED modelling. We further explore the link between DSFG populations and large-scale overdensity environments at high redshift.
As a case study, we report a prominent filamentary overdensity at z≃3.4-3.5 in the GOODS-S field, with several spectroscopically confirmed galaxy members. This structure illustrates the BEACON survey's ability to uncover early large-scale structures and their embedded star-forming populations, offering new insights into the formation of cosmic web features in the early universe.