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The role of starburst galaxies and mergers in the distant Universe
10 Marzo 2020 @ 11:45 - 12:45
Starburst galaxies are the most luminous star-forming powered objects in the Universe. A long standing problem in galaxy evolution is to understand whether these systems are caused by merger events, or they are just gas rich galaxies undergoing stochastic accretion events. To properly characterize them, we need infrared data, given the huge dust attenuations affecting their UV and optical emission.
I will present a unique set of near-infrared rest-frame spectral observations of star-forming galaxies at redshift ~ 0.7, and show how these can be used to understand the dust properties and origin of starbursts. Furthermore, I will explain how additional multiwavelength information (from radio to X-rays) is crucial to trace the whole sequence of mergers, test the merger-AGN connection and the formation mechanism of passive galaxies. Finally, I will exploit high-resolution HST images to investigate the role of mergers on the origin of bright star-forming clumps in high-redshift galaxies. A complete study of near-infrared rest-frame lines will allow JWST to probe the physical properties (e.g., dust attenuation, metallicity) and the nature of the most dust-embedded systems up to the reionization epoch.