What powers Hyperluminous Infrared galaxies at z~1-2?
Abstract
We investigate what powers hyperluminous infrared galaxies (HyLIRGs; LIR(8-1000um)>1013 Lsun) at z~1-2, by examining the behaviour of the infrared AGN luminosity function in relation to the infrared galaxy luminosity function. The former corresponds to emission from AGN-heated dust only, whereas the latter includes emission from dust heated by stars and AGN. Our results show that the two luminosity functions are substantially different below 1013 Lsun but converge in the HyLIRG regime. We find that the fraction of AGN dominated sources increases with total infrared luminosity and at LIR >1013.5 Lsun AGN can account for the entire infrared emission. We conclude that the bright end of the 1<z<2 infrared galaxy luminosity function is shaped by AGN rather than star-forming galaxies.
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