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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 <jats:italic>z<\/jats:italic>\u00a0\u223c\u00a01 radio galaxies. We find that <jats:italic>z<\/jats:italic>\u00a0\u223c\u00a01 radio-loud active galactic nucleus (AGN) occur exclusively in predominantly old galaxies with high velocity dispersions: <jats:italic>\u03c3<\/jats:italic>\n                  <jats:sub>*<\/jats:sub> &gt; 175 km s<jats:sup>\u22121<\/jats:sup>, corresponding to black hole masses in excess of 10<jats:sup>8<\/jats:sup>\n                  <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub>. Furthermore, we confirm that at a fixed stellar mass the fraction of radio-loud AGN at <jats:italic>z<\/jats:italic> \u223c 1 is five to 10 times higher than in the local universe, suggesting that quiescent, massive galaxies at <jats:italic>z<\/jats:italic> \u223c 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 <jats:italic>z<\/jats:italic> \u223c 1.<\/jats:p>","DOI":"10.3847\/1538-4357\/aa8768","type":"journal-article","created":{"date-parts":[[2017,9,21]],"date-time":"2017-09-21T13:13:55Z","timestamp":1505999635000},"page":"72","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":35,"title":["Stellar Dynamics and Star Formation Histories of z\u00a0\u223c\u00a01 Radio-loud Galaxies"],"prefix":"10.3847","volume":"847","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6371-6274","authenticated-orcid":false,"given":"Ivana","family":"Bari\u0161i\u0107","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5027-0135","authenticated-orcid":false,"given":"Arjen","family":"van der 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