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Obscured active galactic nuclei triggered in compact star-forming galaxies

Chang, Yu-Yen and Le Floc'h, Emeric and Juneau, Stéphanie and da Cunha, Elisabete and Salvato, Mara and Civano, Francesca and Marchesi, Stefano and Gabor, J. M. and Ilbert, Olivier and Laigle, Clotilde and McCracken, H. J. and Hsieh, Bau-Ching and Capak, Peter (2017) Obscured active galactic nuclei triggered in compact star-forming galaxies. Monthly Notices of the Royal Astronomical Society: Letters, 466 (1). L103-L107. ISSN 1745-3925. doi:10.1093/mnrasl/slw247.

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We present a structural study of 182 obscured active galactic nuclei (AGNs) at z ≤ 1.5, selected in the Cosmic Evolution Survey field from their extreme infrared to X-ray luminosity ratio and their negligible emission at optical wavelengths. We fit optical to far-infrared spectral energy distributions and analyse deep Hubble Space Telescope imaging to derive the physical and morphological properties of their host galaxies. We find that such galaxies are more compact than normal star-forming sources at similar redshift and stellar mass, and we show that it is not an observational bias related to the emission of the AGN. Based on the distribution of their UVJ colours, we also argue that this increased compactness is not due to the additional contribution of a passive bulge. We thus postulate that a vast majority of obscured AGNs reside in galaxies undergoing dynamical compaction, similar to processes recently invoked to explain the formation of compact star-forming sources at high redshift.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
da Cunha, Elisabete0000-0001-9759-4797
Salvato, Mara0000-0001-7116-9303
Civano, Francesca0000-0002-2115-1137
Marchesi, Stefano0000-0001-5544-0749
Ilbert, Olivier0000-0002-7303-4397
McCracken, H. J.0000-0002-9489-7765
Hsieh, Bau-Ching0000-0001-5615-4904
Capak, Peter0000-0003-3578-6843
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 December 6. Received 2016 December 6; in original form 2016 July 12. Published: 10 December 2016. We thank the referee as well as A. Dekel and D. Elbaz for helpful comments and discussions. We acknowledge the contribution of the entire COSMOS collaboration as well as a financial support from ANR (#ANR-12-JS05-0008-01).
Group:COSMOS, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)ANR-12-JS05-0008-01
Subject Keywords:galaxies: active – galaxies: star formation – infrared: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20170928-142402442
Persistent URL:
Official Citation:Yu-Yen Chang, Emeric Le Floc'h, Stéphanie Juneau, Elisabete da Cunha, Mara Salvato, Francesca Civano, Stefano Marchesi, J. M. Gabor, Olivier Ilbert, Clotilde Laigle, H. J. McCracken, Bau-Ching Hsieh, Peter Capak; Obscured active galactic nuclei triggered in compact star-forming galaxies, Monthly Notices of the Royal Astronomical Society: Letters, Volume 466, Issue 1, 21 March 2017, Pages L103–L107,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81906
Deposited By: Tony Diaz
Deposited On:28 Sep 2017 21:34
Last Modified:15 Nov 2021 19:47

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