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We present Infrared Space Observatory mid- and far-infrared spectroscopy ofthe merging galaxy NGC 6240, an object presenting many aspects of importancefor the role of star formation and AGN activity in [ultra]luminous infraredgalaxies. The mid-infrared spectrum shows starburst indicators in the form oflow excitation fine-structure line emission and aromatic `PAH' features. Astrong high excitation [OIV] line is observed which most likely originates inthe Narrow Line Region of an optically obscured AGN. NGC 6240 shows extremelypowerful emission in the pure rotational lines of molecular hydrogen. We arguethat this emission is mainly due to shocks in its turbulent central gascomponent and its starburst superwind. The total shock cooling in infraredemission lines accounts for ~0.6% of the bolometric luminosity, mainly throughrotational H_2 emission and the [OI] 63micron line. We analyse several ways ofestimating the luminosities of the starburst and the AGN in NGC 6240 andsuggest that the contributions to its bolometric luminosity are most likely inthe range 50-75% starburst and 25-50% AGN.

ISO spectroscopy of star formation and active nuclei in the luminous infrared galaxy NGC 6240