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American Astronomical Society, Astrophysical Journal, 1(696), p. 396-410, 2009

DOI: 10.1088/0004-637x/696/1/396

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Ongoing and co-evolving star formation in zCOSMOS galaxies hosting Active Galactic Nuclei

Journal article published in 2008 by J. D. Silverman, F. Lamareille, C. Maier, S. J. Lilly, V. Mainieri, M. Brusa, N. Cappelluti ORCID, G. Hasinger, G. Zamorani, M. Scodeggio, M. Bolzonella, T. Contini, C. M. Carollo, K. Jahnke, J.-P. Kneib ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We present a study of the host galaxies of active galactic nucleus (AGN) selected from the zCOSMOS survey to establish if accretion onto supermassive black holes (SMBHs) and star formation are explicitly linked up to z ~ 1. We identify 152 galaxies that harbor AGN, based on their X-ray emission (L 0.5-10 keV>1042 erg s–1) detected by XMM-Newton observations of 7543 galaxies (i acs 4 × 1010 M sun). The close association between AGN activity and star formation is further substantiated by an increase in the fraction of galaxies hosting AGN with the youthfulness of their stars as indicated by the rest-frame color (U–V) and spectral index Dn (4000); we demonstrate that a mass-selected sample is required to alleviate an artificial peak in the AGN fraction falling in the transition region due to the fact that many "blue cloud" galaxies have low mass-to-light ratios in luminosity-limited samples. We also find that the SFRs of AGN hosts evolve with cosmic time in a manner that closely mirrors the overall galaxy population and naturally explains the low SFRs in AGNs (z