%0 Journal Article
%T AGN in dwarf galaxies: frequency, triggering processes and the plausibility of AGN feedback
%+ Institut d'Astrophysique de Paris (IAP)
%+ Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112))
%A Kaviraj, Sugata
%A Martin, Garreth
%A Silk, Joseph
%< avec comité de lecture
%@ 1745-3933
%J Monthly Notices of the Royal Astronomical Society: Letters
%I Oxford Journals
%V 489
%P L12-L16
%8 2019
%D 2019
%Z 1906.10697
%Z 2019MNRAS.489L..12K
%R 10.1093/mnrasl/slz102
%K galaxies: active
%K galaxies: dwarf
%K galaxies: evolution
%K Astrophysics - Astrophysics of Galaxies
%Z Sciences of the Universe [physics]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles
%X While active galactic nuclei (AGN) are considered to be key drivers of the evolution of massive galaxies, their potentially significant role in the dwarf-galaxy regime (M* < 109 M⊙) remains largely unexplored. We combine optical and infrared data, from the Hyper Suprime-Cam (HSC) and the Wide-field Infrared Explorer, respectively, to explore the properties of ∼800 AGN in dwarfs at low redshift (z < 0.3). Infrared-selected AGN fractions are ∼10-30 per cent in dwarfs, which, for reasonable duty cycles, indicates a high black hole (BH)-occupation fraction. Visual inspection of the deep HSC images indicates that the merger fraction in dwarf AGN (∼6 per cent) shows no excess compared to a control sample of non-AGN, suggesting that the AGN-triggering processes are secular in nature. Energetic arguments indicate that, in both dwarfs and massive galaxies, bolometric AGN luminosities (LAGN) are significantly greater than supernova luminosities (LSN). LAGN/LSN is, in fact, higher in dwarfs, with predictions from simulations suggesting that this ratio only increases with redshift. Together with the potentially high BH-occupation fraction, this suggests that if AGN feedback is an important driver of massive-galaxy evolution, the same is likely to be true in the dwarf regime, contrary to our classical thinking.
%G English
%2 https://insu.hal.science/insu-03746191/document
%2 https://insu.hal.science/insu-03746191/file/slz102.pdf
%L insu-03746191
%U https://insu.hal.science/insu-03746191
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%~ UNIV-PARIS-SACLAY
%~ CEA-UPSAY-SACLAY
%~ CEA-DRF
%~ SORBONNE-UNIVERSITE
%~ SORBONNE-UNIV
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