We present ISOCAM 15 \mu m and MIPS 24 \mu m photometry of a sample of 16 distant Luminous Infrared Galaxies ( LIRGs ) characterized by a median luminosity L _ { IR } \sim 2 \times 10 ^ { 11 } L _ { \odot } and redshift z = 0.7 ( distributed from z = 0.1 to 1.2 ) .
While some sources display 24/15 \mu m flux ratios also consistent with a featureless continuum dominating their mid-infrared ( MIR ) spectral energy distributions ( SEDs ) , the presence of prominent emission features such as the Polycyclic Aromatic Hydrocarbons is clearly required to explain the observed colors for more than half of the sample .
As a result , a general good agreement is observed between the data and predictions from the local starburst-dominated SEDs that have been used so far to constrain IR galaxy evolution .
This is consistent with the star-forming nature of LIRGs derived from previous works , even though our approach can not rule out the dominance of an AGN in some cases .
Our study also supports the possibility of tracing the total IR luminosity of distant galaxies ( up to z \sim 1 ) from their MIR emission .