I Delvecchio
SMBH accretion properties of radio-selected AGN out to z ∼ 4
Delvecchio, I; Smolčić, V; Zamorani, G; Rosario, DJ; Bondi, M; Marchesi, S; Miyaji, T; Novak, M; Sargent, MT; Alexander, DM; Delhaize, J
Authors
V Smolčić
G Zamorani
DJ Rosario
M Bondi
S Marchesi
T Miyaji
M Novak
MT Sargent
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
J Delhaize
Abstract
Exploring how radio-emitting active galactic nuclei (AGNs) behave and evolve with time is critical for understanding how AGN feedback impacts galaxy evolution. In this work, we investigate the relationship between 1.4 GHz radio continuum AGN luminosity (LAGN1.4), specific black hole accretion rate (s-BHAR, defined as the accretion luminosity relative to the galaxy stellar mass), and redshift, for a luminosity-complete sample of radio-selected AGNs in the VLA COSMOS 3 GHz Large Project. The sample was originally selected from radio-continuum observations at 3 GHz, and includes about 1800 radio AGNs identified via (>2 σ) radio-excess relative to the infrared-radio correlation of star-forming galaxies. We further select a subsample of over 1200 radio AGNs that is complete in LAGN1.4 over different redshift ranges, out to z ∼ 4, and use X-ray stacking to calculate the average s-BHAR in each LAGN1.4–z bin. We find that the average s-BHAR is independent of LAGN1.4, at all redshifts. However, we see a strong increase of s-BHAR with redshift, at fixed LAGN1.4. This trend resembles the strong increase in the fraction of star-forming host galaxies [based on the (NUV − r)/(r − J) colours] with redshift, at fixed LAGN1.4. A possible explanation for this similarity might imply a link between average AGN radiative power and availability of cold gas supply within the host galaxy. This study corroborates the idea that radio-selected AGNs become more radiatively efficient towards earlier epochs, independently of their radio power.
Citation
Delvecchio, I., Smolčić, V., Zamorani, G., Rosario, D., Bondi, M., Marchesi, S., …Delhaize, J. (2018). SMBH accretion properties of radio-selected AGN out to z ∼ 4. Monthly Notices of the Royal Astronomical Society, 481(4), 4971-4983. https://doi.org/10.1093/mnras/sty2600
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 14, 2018 |
Online Publication Date | Sep 24, 2018 |
Publication Date | Sep 24, 2018 |
Deposit Date | Jan 17, 2019 |
Publicly Available Date | Jan 17, 2019 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 481 |
Issue | 4 |
Pages | 4971-4983 |
DOI | https://doi.org/10.1093/mnras/sty2600 |
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Copyright Statement
© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
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