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In order to understand the interactions between active galactic nuclei (AGN)and star formation during the evolution of galaxies, we investigate 142galaxies detected in both X-ray and 70{\mu}m observations in the COSMOS (CosmicEvolution Survey) field. All of our data are obtained from the archive, X-raypoint source catalogs from Chandra and XMM-Newton observations; far-infrared70{\mu}m point source catalog from Spitzer-MIPS observations. Although the IRAC[3.6{\mu}m]-[4.5{\mu}m] vs. [5.8{\mu}m]-[8.0{\mu}m] colours of our sampleindicate that only ~63% of our sources would be classified as AGN, the ratio ofthe rest-frame 2-10 keV luminosity to the total infrared luminosity(8-1000{\mu}m) shows that all of the sample has comparatively higher X-rayluminosity than that expected from pure star-forming galaxies, suggesting thepresence of an AGN in all of our sources. From the analysis of the X-rayhardness ratio, we find that sources with both 70{\mu}m and X-ray detectiontend to have a higher hardness ratio relative to the whole X-ray selectedsource population, suggesting the presence of more X-ray absorption in the70{\mu}m detected sources. In addition, we find that the observed far-infraredcolours of 70{\mu}m detected sources with and without X-ray emission aresimilar, suggesting the far-infrared emission could be mainly powered by starformation.

Role of AGNs in the Luminous Infrared Galaxy phase since z ~ 3