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We study star formation (SF) in very active environments, in luminous IRgalaxies, which are often interacting. A variety of phenomena are detected,such as central starbursts, circumnuclear SF, obscured SNe tracing the historyof recent SF, massive super star clusters, and sites of strong off-nuclear SF.All of these can be ultimately used to define the sequence of triggering andpropagation of star-formation and interplay with nuclear activity in the livesof gas rich galaxy interactions and mergers. In this paper we present analysisof high-spatial resolution integral field spectroscopy of central regions oftwo interacting LIRGs. We detect a nuclear 3.3 um PAH ring around the core ofNGC 1614 with thermal-IR IFU observations. The ring's characteristics andrelation to the strong star-forming ring detected in recombination lines arepresented, as well as a scenario of an outward expanding starburst likelyinitiated with a (minor) companion detected within a tidal feature. We thenpresent NIR IFU observations of IRAS 19115-2124, aka the Bird, which is anintriguing triple encounter. The third component is a minor one, but,nevertheless, is the source of 3/4 of the SFR of the whole system. Gas inflowsand outflows are detected at the locations of the nuclei. Finally, we brieflyreport on our on-going NIR adaptive optics imaging survey of several dozenLIRGs. We have detected highly obscured core-collapse SNe in the central kpc,and discuss the statistics of "missing SNe" due to dust extinction. We are alsodetermining the characteristics of hundreds of super star clusters in andaround the core regions of LIRGs, as a function of host-galaxy properties.

Central regions of LIRGs: rings, hidden starbursts, Supernovae and star clusters