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The Luminous Infrared Galaxy NGC1614 hosts a prominent circumnuclear ring ofstar formation. However, the nature of the dominant emitting mechanism in itscentral ~100 pc is still under debate. We present sub-arcsecond angularresolution radio, mid-infrared, Pa-alpha, optical, and X-ray observations ofNGC1614, aimed at studying in detail both the circumnuclear ring and thenuclear region. The 8.4 GHz continuum emission traced by the Very Large Array(VLA) and the Gemini/T-ReCS 8.7 micron emission, as well as the Pa-alpha lineemission, show remarkable morphological similarities within the star-formingring, suggesting that the underlying emission mechanisms are tightly related.We used an HST/NICMOS Pa-alpha map of similar resolution to our radio maps todisentangle the thermal free-free and non-thermal synchrotron radio emission,from which we obtained the intrinsic synchrotron power-law for each individualregion within the central kpc of NGC1614. The radio ring surrounds a relativelyfaint, steep-spectrum source at the very center of the galaxy, suggesting thatthe central source is not powered by an AGN, but rather by a compact (r < 90pc) starburst. Chandra X-ray data also show that the central kpc region isdominated by starburst activity, without requiring the existence of an AGN. Wealso used publicly available infrared data to model-fit the spectral energydistribution of both the starburst ring and a putative AGN in NGC1614. Insummary, we conclude that there is no need to invoke an AGN to explain theobserved bolometric properties of the galaxy.

A multi-wavelength view of the central kiloparsec region in the Luminous Infrared Galaxy NGC1614