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I summarize the results of our integral field spectroscopic observations ofthe nearby prototype of HII galaxies, II Zw 40. Observations with GMOS-IFU onGEMINI-North in the optical allowed us to make a detailed kinematic picture ofthe central starburst, while SINFONI with adaptive optics on the ESO-VLT gaveus a near-IR view of the interplay between the ISM phases.  Here, I also address the question that not all starbursts require an externaltrigger such as a galaxy-galaxy encounter, as it seems to be the case for afraction of low luminosity HII galaxies. We speculate that these may form starsspontaneously like "pop-corn in a pan".

Starburst in the interacting HII galaxy II Zw 40 and in non-interacting HII galaxies