Radio-Quiet Quasars in the VIDEO Survey: Evidence for AGN-powered radio emission at S_1.4GHz < 1 mJy

Boris H\"au{\ss}ler; Matt J. Jarvis; Natasha Maddox; Sarah V. White

Radio-Quiet Quasars in the VIDEO Survey: Evidence for AGN-powered radio emission at S₁.4GHz < 1 mJy

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arxiv 1410.3892 v2 pith:IRFEAZE4 submitted 2014-10-14 astro-ph.GA

Radio-Quiet Quasars in the VIDEO Survey: Evidence for AGN-powered radio emission at S₁.4GHz < 1 mJy

Sarah V. White , Matt J. Jarvis , Boris H\"au{\ss}ler , Natasha Maddox This is my paper

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Understanding the interplay between black-hole accretion and star formation, and how to disentangle the two, is crucial to our understanding of galaxy formation and evolution. To investigate, we use a combination of optical and near-infrared photometry to select a sample of 74 quasars from the VISTA Deep Extragalactic Observations (VIDEO) Survey, over 1 deg$^2$. The depth of VIDEO allows us to study very low accretion rates and/or lower-mass black holes, and 26 per cent of the candidate quasar sample has been spectroscopically confirmed. We use a radio-stacking technique to sample below the nominal flux-density threshold using data from the Very Large Array at 1.4 GHz and find, in agreement with other work, that a power-law fit to the quasar-related radio source counts is inadequate at low flux density. By comparing with a control sample of galaxies (where we match in terms of stellar mass), and by estimating the star formation rate, we suggest that this radio emission is predominantly caused by accretion activity rather than star-formation activity.

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The SFR–1.4 GHz radio correlation is log10(SFR) = 0.790(L′)+1.244(1+z)^0.122−0.033M′ with 0.178 dex scatter, showing significant redshift but weak mass dependence when AGN are treated probabilistically.