Hidden AGN in starburst galaxies

Physics

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Scientific paper

Observational evidence have shown that there is a tight relation between the properties of the supermassive black holes (SMBH) and their host galaxies suggesting that the black hole and galaxy grow and evolve together. However, the nature of this relation is still not fully understood. Studying the energy output of the active galactic nuclei (AGN) and the host galaxy across the whole electromagnetic spectrum at different epochs can help to clarify the origin of the AGN-galaxy link. However constraining the properties of the AGN is not trivial due to the contamination from the galaxy, especially at those wavelengths where the star-formation emission peaks (e.g. far-infrared, FIR). Through extensive SED analysis of 322 sources in the GOODS fields using the deepest X-ray, Herschel infrared data, and VLA radio data available to date, we robustly identified the presence of hidden AGNs in 85 starburst galaxies (26%) out to z=3. Approximately 60% of these IR AGNs are X-ray detected (~40% of all the X-ray identified AGNs in GOODS-Herschel), while the remainders were not identified in X-rays. The majority of these systems (˜90%) are still dominated by starburst emission at FIR wavelengths and the FIR luminosity seems to correlate with the luminosity of the AGN at 6μm.

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