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

Autori
Barišić, Ivana ; van der Wel, Arjen ; Bezanson, Rachel ; Pacifici, Camilla ; Noeske, Kai ; Muñoz-Mateos, Juan C. ; Franx, Marijn ; Smolčić, Vernesa ; Bell, Eric F. ; Brammer, Gabriel ; Calhau, João ; Chauké, Priscilla ; van Dokkum, Pieter G. ; van Houdt, Josha ; Gallazzi, Anna ; Labbé, Ivo ; Maseda, Michael V. ; Muzzin, Adam ; Sobral, David ; Straatman, Caroline ; Wu, Po-Feng

Izvornik
The Astrophysical journal (0004-637X) 847 (2017), 1; 72-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
galaxies: evolution, galaxies: fundamental parameters, galaxies: high-redshift, galaxies: jets, galaxies: star formation

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA