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The quasar feedback survey: Discovering hidden Radio-AGN and their connection to the host galaxy ionized gas

Lookup NU author(s): Dr Christopher HarrisonORCiD


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© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical SocietyWe present the first results from the Quasar Feedback Survey, a sample of 42 z < 0.2, [O III] luminous AGNs (L[O III] > 1042.1 ergs s−1) with moderate radio luminosities (i.e. L1.4GHz > 1023.4 W Hz−1; median L1.4GHz = 5.9 × 1023 W Hz−1). Using high spatial resolution (∼0.3-1 arcsec), 1.5-6 GHz radio images from the Very Large Array, we find that 67 per cent of the sample have spatially extended radio features on ∼1-60 kpc scales. The radio sizes and morphologies suggest that these may be lower radio luminosity versions of compact, radio-loud AGNs. By combining the radio-to-infrared excess parameter, spectral index, radio morphology, and brightness temperature, we find radio emission in at least 57 per cent of the sample that is associated with AGN-related processes (e.g. jets, quasar-driven winds, or coronal emission). This is despite only 9.5-21 per cent being classified as radio-loud using traditional criteria. The origin of the radio emission in the remainder of the sample is unclear. We find that both the established anticorrelation between radio size and the width of the [O III] line, and the known trend for the most [O III] luminous AGNs to be associated with spatially extended radio emission, also hold for our sample of moderate radio luminosity quasars. These observations add to the growing evidence of a connection between the radio emission and ionized gas in quasar host galaxies. This work lays the foundation for deeper investigations into the drivers and impact of feedback in this unique sample.

Publication metadata

Author(s): Jarvis ME, Harrison CM, Mainieri V, Alexander DM, Battaia FA, Rivera GC, Circosta C, Costa T, de Breuck C, Edge AC, Girdhar A, Kakkad D, Kharb P, Lansbury GB, Molyneux SJ, Mukherjee D, Mullaney JR, Farina EP, Silpa S, Thomson AP, Ward SR

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2021

Volume: 503

Issue: 2

Pages: 1780-1797

Online publication date: 03/05/2021

Acceptance date: 21/02/2021

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Oxford University Press


DOI: 10.1093/mnras/stab549


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