Radio galaxies in ZFOURGE/NMBS: no difference in the properties of massive galaxies with and without radio-AGN out to z = 2.25
Article
Article Title | Radio galaxies in ZFOURGE/NMBS: no difference in the properties of massive galaxies with and without radio-AGN out to z = 2.25 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Rees, G. A., Spitler, L. R., Norris, R. P., Cowley, M. J., Papovich, C., Glazebrook, K., Quadri, R. F., Straatman, C. M. S., Allen, R., Kacprzak, G. G., Labbé, I., Nanayakkara, T., Tomczak, A. R. and Tran, K.-H. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 455 (3), pp. 2731-2744 |
Number of Pages | 14 |
Year | 2016 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stv2468 |
Web Address (URL) | https://academic.oup.com/mnras/article/455/3/2731/2892459 |
Abstract | In order to reproduce the high-mass end of the galaxy mass distribution, some process must be responsible for the suppression of star formation in the most massive of galaxies. Commonly active galactic nuclei (AGN) are invoked to fulfil this role, but the exact means by which they do so is still the topic of much debate, with studies finding evidence for both the suppression and enhancement of star formation in AGN hosts. Using the ZFOURGE (FourStar Galaxy Evolution) andNMBS(Newfirm Medium Band Survey) galaxy surveys, we investigate the host galaxy properties of a mass-limited (M ≥ 1010.5M⊙), high-luminosity (L1.4 > 1024WHz-1) sample of radio-loud AGN to a redshift of z = 2.25. In contrast to low-redshift studies, which associate radio-AGN activity with quiescent hosts, we find that the majority of z > 1.5 radio-AGN are hosted by star-forming galaxies. Indeed, the stellar populations of radio-AGN are found to evolve with redshift in a manner that is consistent with the non-AGN mass-similar galaxy population. Interestingly, we find that the radio-AGN fraction is constant across a redshift range of 0.25 ≤ z < 2.25, perhaps indicating that the radio-AGN duty cycle has little dependence on redshift or galaxy type. We do however see a strong relation between the radio-AGN fraction and stellar mass, with radio-AGN becoming rare below ~1010.5M⊙ or a halo mass of 1012M⊙. This halo-mass threshold is in good agreement with simulations that initiate radio-AGN feedback at this mass limit. Despite this, we find that radio-AGN host star formation rates are consistent with the non-AGN mass-similar galaxy sample, suggesting that while radio-AGN are in the right place to suppress star formation in massive galaxies they are not necessarily responsible for doing so. |
Keywords | Galaxies: active; Galaxies: evolution; Galaxies: high-redshift; Galaxies: stellar content; Infrared: galaxies; Radio continuum: galaxies |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Funder | Australian Research Council |
Byline Affiliations | Macquarie University |
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia | |
Australian Astronomical Observatory, Australia | |
Texas A&M University, United States | |
Swinburne University of Technology | |
Leiden University, Netherlands |
https://research.usq.edu.au/item/w45y1/radio-galaxies-in-zfourge-nmbs-no-difference-in-the-properties-of-massive-galaxies-with-and-without-radio-agn-out-to-z-2-25
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