Stellar Dynamics and Star Formation Histories of z ̃ 1 Radio-loud Galaxies

Journal
Date Issued
2017
Author(s)
Barišić, Ivana
•
•
Bezanson, Rachel
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Pacifici, Camilla
•
Noeske, Kai
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Muñoz-Mateos, Juan C.
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Franx, Marijn
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Smolčić, Vernesa
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Bell, Eric F.
•
Brammer, Gabriel
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Calhau, João
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Chauké, Priscilla
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van Dokkum, Pieter G.
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van Houdt, Josha
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•
Labbé, Ivo
•
Maseda, Michael V.
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Muzzin, Adam
•
Sobral, David
•
Straatman, Caroline
•
Wu, Po-Feng
DOI
Abstract
We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities (L 3 GHz > 1023 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 ̃ 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 108 M ☉. 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 z ̃ 1.
Volume
847
Issue
1
Start page
72
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2017ApJ...847...72B
Rights
open.access
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