Oral Presentation

Unveiling the Enigmatic Universe of Hyper Luminous Infrared Galaxies: Insights from AS2COSPEC

Author(s):

Presenter: Chian-Chou Chen (tc) (ASIAA)

The highly intense star-forming galaxies, particularly the most massive ones, offer a unique platform to scrutinize theories concerning the baryon cycle. Understanding the driving physics behind their vigorous star formation activities is pivotal. Moreover, it's crucial to ascertain whether their interstellar medium (ISM) properties resemble those of less massive and less active systems, and if their physical characteristics such as mass and number density can be explained within existing theoretical frameworks. To tackle these inquiries, we've launched AS2COSPEC, a comprehensive spectroscopic survey targeting a complete and flux-limited sample of 54 dusty star-forming galaxies (DSFGs) selected at 850 microns in the COSMOS field. We've achieved a remarkable success rate in detecting emission lines in over 90% of cases, establishing spectroscopic redshifts at z=2-5. Utilizing meticulous spectral energy distribution (SED) fittings with high-quality multi-wavelength photometry from X-ray to radio data available in COSMOS, we've inferred their physical properties. Our findings reveal that these galaxies are largely unlensed and exhibit intrinsic infrared luminosities comparable to Hyper Luminous Infrared Galaxies (HyLIRGs). During this presentation, I'll delve into their ISM characteristics, encompassing aspects such as star formation, dust content, and molecular gas based on subsequent CO and [CI] observations. Furthermore, I'll unveil preliminary insights gleaned from our analysis of their dynamics and morphology, facilitated by newly obtained imaging data from the James Webb Space Telescope (JWST).