Probing the continuum dust properties of high-z dusty galaxies using NOEMA
Abstract
The study of dusty star-forming galaxies (DSFGs) is an ongoing frontier in astrophysics, continuously yielding new insights into these cosmic nurseries from the early Universe. Thanks to advancements in observational facilities, we now have access to high-resolution data across various wavelengths, which is crucial for better understanding the physical characteristics and nature of DSFGs. In this talk, I will present the dust properties of 125 luminous Herschel-selected galaxies from the z-GAL NOEMA spectroscopic survey (z = 1.3–5.4). The large instantaneous bandwidth of NOEMA provides a unique sampling of the underlying dust continuum emission at 2 and 3 mm in the observed frame, with flux densities in at least four sidebands for each source. Together with the available Herschel-SPIRE and SCUBA-2 flux densities, the spectral energy distribution (SED) of each source can be analyzed from the far-infrared to the millimeter, with a fine sampling of the Rayleigh-Jeans tail. This wealth of data provides a solid basis to derive robust dust properties, in particular the dust emissivity index and the dust temperature.