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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 693440.0, MPI für Astronomie / Publikationen_mpia
AGN in dusty hosts: implications for galaxy evolution
Authors:Symeonidis, M.; Kartaltepe, J.; Salvato, M.; Bongiorno, A.; Brusa, M.; Page, M. J.; Ilbert, O.; Sanders, D.; van der Wel, A.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:433
Issue / Number:2
Start Page:1015
End Page:1022
Review Status:Internal review
Audience:Experts Only
Abstract / Description:We present strong empirical evidence for a physical connection between the occurrence of a starburst (SB) and a luminous active galactic nucleus (AGN) phase. Drawing infrared (IR), X-ray and optically selected samples from COSMOS, we find that the locus of type II AGN hosts in the optical colour-magnitude (U - V/V) and colour-colour (U - V/V - J) space significantly overlaps with that of IR-luminous (LIR > 1010 L) galaxies. Based on our observations, we propose that, when simultaneously building their black hole and stellar masses, type II AGN hosts are located in the same part of colour-colour space as dusty star-forming galaxies. In fact, our results show that IR-luminous galaxies at z < 1.5 are on average three times more likely to host a type II AGN (LX > 1042 erg s-1) than would be expected serendipitously, if AGN and star-formation events were unrelated. In addition, the optical and IR properties of the AGN/SB hybrid systems tentatively suggest that the AGN phase might be coeval with a particularly active phase in a galaxy's star-formation history. Interestingly, we also find a significant fraction of type II AGN hosts offset from the dusty galaxy sequence in colour-colour space, possibly representing a transitional or post-SB phase in galaxy evolution. Our findings are consistent with a scenario whereby AGN play a role in the termination of star formation in massive galaxies.
Free Keywords:galaxies: active; galaxies: evolution; galaxies: starburst; infrared: galaxies; X-rays: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 [ID No:1]
URL:http://cdsads.u-strasbg.fr/abs/2013MNRAS.433.1015S [ID No:2]
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