dc.contributor.author | Kaviraj, Sugata | |
dc.contributor.author | Martin, Garreth | |
dc.contributor.author | Silk, Joseph | |
dc.date.accessioned | 2019-09-19T15:37:19Z | |
dc.date.available | 2019-09-19T15:37:19Z | |
dc.date.issued | 2019-10-01 | |
dc.identifier.citation | Kaviraj , S , Martin , G & Silk , J 2019 , ' AGN in dwarf galaxies: frequency, triggering processes and the plausibility of AGN feedback ' , Monthly Notices of the Royal Astronomical Society , vol. 489 , no. 1 , slz102 , pp. L12–L16 . https://doi.org/10.1093/mnrasl/slz102 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/1906.10697v1 | |
dc.identifier.other | ORCID: /0000-0002-5601-575X/work/77850162 | |
dc.identifier.uri | http://hdl.handle.net/2299/21694 | |
dc.description | © 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society | |
dc.description.abstract | 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 ∗ < 10 9 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 (L AGN) are significantly greater than supernova luminosities (L SN). L AGN/L SN 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. | en |
dc.format.extent | 5 | |
dc.format.extent | 1226610 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.subject | astro-ph.GA | |
dc.subject | galaxies: Dwarf | |
dc.subject | galaxies: Evolution | |
dc.subject | galaxies: Active | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | AGN in dwarf galaxies: frequency, triggering processes and the plausibility of AGN feedback | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | Centre of Data Innovation Research | |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=85071127061&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | 10.1093/mnrasl/slz102 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |