Stellar Dynamics and Star Formation Histories of z ∼ 1 Radio-loud Galaxies
Journal
Astrophysical Journal
Journal Volume
847
Journal Issue
1
Date Issued
2017
Author(s)
Barišić I
Van Der Wel A
Bezanson R
Pacifici C
Noeske K
Muñoz-Mateos J.C
Franx M
Smolčić V
Bell E.F
Brammer G
Calhau J
Chauké P
Van Dokkum P.G
Van Houdt J
Gallazzi A
Labbé I
Maseda M.V
Muzzin A
Sobral D
Straatman C
Abstract
We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities (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 ∼ 1 radio galaxies. We find that z ∼ 1 radio-loud active galactic nucleus (AGN) occur exclusively in predominantly old galaxies with high velocity dispersions: σ > 175 km s-1, corresponding to black hole masses in excess of. Furthermore, we confirm that at a fixed stellar mass the fraction of radio-loud AGN at z 1 is five to 10 times higher than in the local universe, suggesting that quiescent, massive galaxies at z ∼ 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 1. © 2017. The American Astronomical Society. All rights reserved.
Subjects
galaxies: evolution; galaxies: fundamental parameters; galaxies: high-redshift; galaxies: jets; galaxies: star formation
Type
journal article