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We explore the nature of X‐ray sources with  70 μm  counterparts selected in the Spitzer Wide‐Area Infrared Extragalactic Survey (SWIRE) fields: ELAIS‐N1, Lockman Hole and Chandra Deep Field South, for which  Chandra  X‐ray data are available. A total of 28 X‐ray/ 70 μm  sources in the redshift interval  0.5 &lt;  z  &lt; 1.3  are selected. The X‐ray luminosities and the shape of the X‐ray spectra show that these sources are active galactic nuclei (AGN). Modelling of the optical to far‐infrared (IR) spectral energy distribution indicates that most of them (27/28) have a strong starburst component  (&gt;50 M ⊙  yr −1 )  that dominates in the IR. It is found that the X‐ray and IR luminosities of the sample sources are broadly correlated, consistent with a link between AGN activity and star formation. Contrary to the predictions of some models for the co‐evolution of AGN and galaxies, the X‐ray/ 70 μm  sources in the sample are not more obscured at X‐ray wavelengths compared to the overall X‐ray population. It is also found that the X‐ray/ 70 μm  sources have lower specific star formation rates compared to the general  70 μm  population, consistent with AGN feedback moderating the star formation in the host galaxies.

Testing the starburst/AGN connection with SWIRE X‐ray/70 μm sources