Oral Presentation

Unravelling the Characteristics and Evolution of Dusty Star-Forming Galaxies in the COSMOS Field

Author(s): Yu-Han Ling (NTU, ASIAA), Chian-Chou Chen (ASIAA)

Presenter: Yu-Han Ling (NTU, ASIAA)

We explore the characteristics and development of dusty star-forming galaxies within the COSMOS field. Utilizing flux measurements from the super-deblended catalog, we identified 41 main-sequence galaxies and analyzed their gas-phase metallicity using spectroscopic observations from Keck/MOSFIRE and VLT/KMOS. Employing Modified Black Body (MBB) spectral energy distribution (SED) fitting, we estimated dust mass and dust temperature. Our study categorized the sample into three redshift bins (z=0.9, 1.4, and 2.2) to distinguish evolutionary patterns. Additionally, we utilized stacked images with the non-detection sources spanning 100um to 1200um to investigate lower dust mass. Our findings indicate a correlation between higher stellar mass and increased dust mass, as well as a positive relationship between gas-phase metallicity and dust mass. The dust-to-stellar mass ratio, when considering gas-phase metallicity, displays no discernible trend across redshift bins. Surprisingly, no significant evolutionary trends are evident in the examined physical properties. Nonetheless, the observed dust mass at a given stellar mass and gas-phase metallicity does not significantly exceed values found in the local universe, highlighting the intricate interplay of factors influencing the characteristics of dusty star-forming galaxies across cosmic epochs.