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

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

Sarah V. White , Matt J. Jarvis , Boris Häu{ss}ler , Natasha Maddox This is my paper · ORCID
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keywords sampleaccretionformationradiovideoactivityemissionquasars
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abstract

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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Cited by 2 Pith papers

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    astro-ph.GA 2026-08 conditional novelty 4.0 of 10

    A 325 MHz uGMRT mosaic of the GAMA-23 field yields a 5741-source catalog, source counts, spectral indices, and angular power spectra of diffuse Galactic synchrotron emission.

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