Speaker
Description
Submillimeter galaxies (SMGs) are characterized by high star formation rates (SFRs) and strong luminosities in the far-infrared and submillimeter regimes. They represent a key population in galaxy evolution, exhibiting extreme star-forming activity and large stellar masses. Near-infrared spectroscopy is particularly effective for characterizing SMGs, especially at cosmic noon (z ∼ 2) and higher redshifts, where several important emission lines are redshifted into the near-infrared. We compile a sample of 81 SMGs from SCUBA-2 and ALMA surveys, including sources in the UDS, COSMOS, and GOODS-S fields. Using near-infrared spectra obtained with JWST/NIRSpec, we perform spectral fitting and measure key emission lines. We classify sources as AGN- or starburst-dominated based on the [S III]/Paγ and Paβ/[Fe II] line ratio. Our initial results show that most SMGs in our sample are classified as starburst-dominated or composite systems. This may indicate either a low prevalence of AGN activity or that AGNs in these systems are heavily obscured by dust. We will further compare the emission-line diagnostics with ALMA continuum to understand the level of dust obscuration and assess its impact on the detectability of AGN signatures. These results provide constraints on the role of dust in shaping the observed properties of SMGs and the co-evolution of star formation and AGN activity.
| Participate the oral/poster presentation award competition | Yes |
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