Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.3847/1538-4357/aa8768 © Copyright 2017 IOP Publishing
Accepted author manuscript, 2.78 MB, PDF document
Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
| Article number | 72 |
|---|---|
| <mark>Journal publication date</mark> | 21/09/2017 |
| <mark>Journal</mark> | The Astrophysical Journal |
| Issue number | 1 |
| Volume | 847 |
| Number of pages | 9 |
| Publication Status | Published |
| <mark>Original language</mark> | English |
We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities (L-3 GHz > 10(23) W Hz(-1)) at 0.6 <z <1. This sample is constructed by cross-matching galaxies from the deep VLT/VIMOS LEGA-C spectroscopic survey with the VLA 3 GHz data set. The LEGA-C continuum spectra reveal for the first time stellar velocity dispersions and age indicators of z similar to 1 radio galaxies. We find that z similar to 1 radio-loud active galactic nucleus (AGN) occur exclusively in predominantly old galaxies with high velocity dispersions: sigma(*) > 175 kms(-1), corresponding to black hole masses in excess of 10(8) M-circle dot. Furthermore, we confirm that at a fixed stellar mass the fraction of radio-loud AGN at z similar to 1 is five to 10 times higher than in the local universe, suggesting that quiescent, massive galaxies at z similar to 1 switch on as radio AGN on average once every Gyr. Our results strengthen the existing evidence for a link between high black hole masses, radio loudness, and quiescence at z similar to 1.