The lens SW05 J143454.4+522850: a fossil group at redshift 0.6?
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 506:2 (2021) 1715-1722
A low [CII]/[NII] ratio in the center of a massive galaxy at z = 3.7: Evidence for a transition to quiescence at high redshift? (vol 646, A68, 2021)
ASTRONOMY & ASTROPHYSICS 650 (2021) ARTN C2
A low [CII]/[NII] ratio in the center of a massive galaxy at z=3.7: evidence for a transition to quiescence at high redshift
ASTRONOMY & ASTROPHYSICS 646 (2021) ARTN A68
Accretion and star formation in 'radio-quiet' quasars
Proceedings of the International Astronomical Union (2021) 204-208
Abstract:© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union. Radio observations allow us to identify a wide range of active galactic nuclei (AGN), which play a significant role in the evolution of galaxies. Amongst AGN at low radio-luminosities is the 'radio-quiet' quasar (RQQ) population, but how they contribute to the total radio emission is under debate, with previous studies arguing that it is predominantly through star formation. In this talk, SVW summarised the results of recent papers on RQQs, including the use of far-infrared data to disentangle the radio emission from the AGN and that from star formation. This provides evidence that black-hole accretion, instead, dominates the radio emission in RQQs. In addition, we find that this accretion-related emission is correlated with the optical luminosity of the quasar, whilst a weaker luminosity-dependence is evident for the radio emission connected with star formation. What remains unclear is the process by which this accretion-related emission is produced. Understanding this for RQQs will then allow us to investigate how this type of AGN influences its surroundings. Such studies have important implications for modelling AGN feedback, and for determining the accretion and star-formation histories of the Universe.
The rest-frame UV luminosity function at z≃4 : a significant contribution of AGN to the bright-end of the galaxy population
Monthly Notices of the Royal Astronomical Society Oxford University Press 494:2 (2020) 1771-1783