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http://hdl.handle.net/20.500.12386/27017
Titolo: | 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 Rita Labbé, Ivo Maseda, Michael V. Muzzin, Adam Sobral, David Straatman, Caroline Wu, Po-Feng |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 847 | Fascicolo: | 1 | Da pagina:: | 72 | Abstract: | We investigate the stellar kinematics and stellar populations of 58 radio-loud galaxies of intermediate luminosities (L <SUB>3 GHz</SUB> > 10<SUP>23</SUP> W Hz<SUP>-1</SUP>) 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 <SUB>*</SUB> > 175 km s<SUP>-1</SUP>, corresponding to black hole masses in excess of 10<SUP>8</SUP> M <SUB>☉</SUB>. 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. | URI: | http://hdl.handle.net/20.500.12386/27017 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aa8768 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aa8768 | Bibcode ADS: | 2017ApJ...847...72B | Fulltext: | open |
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