Starbursts and dusty tori in distant 3CR radio galaxies

Abstract

We present a study of the complete ultraviolet to submillimetre spectral energy distributions (SEDs) of twelve 3CR radio galaxy hosts in the redshift range $1.0<z<2.5$, which were all detected in the far-infrared by the Herschel Space Observatory. The study employs the new spectro-chemical evolutionary code PÉGASE.3, in combination with recently published clumpy AGN torus models. We uncover the properties of the massive host galaxy stellar populations, the AGN torus luminosities, and the properties of the recent starbursts, which had earlier been inferred in these objects from their infrared SEDs. The PÉGASE.3 fitting yields very luminous (up to 10${}^{13}$L${}_{\odot }$) young stellar populations with ages of several hundred million years in hosts with masses exceeding 10${}^{11}$M${}_{\odot }$. Dust masses are seen to increase with redshift, and a surprising correlation -- or better upper envelope behaviour -- is found between the AGN torus luminosity and the starburst luminosity, as revealed by their associated dust components. The latter consistently exceeds the former by a constant factor, over a range of one order of magnitude in both quantities.

15 pages, 9 figures, accepted for publication in MNRAS

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• Pégase.3: A code for modeling the UV-to-IR/submm spectral and chemical evolution of galaxies with dust
• What produces the far-infrared/submm emission in the most luminous QSOs?
• AGN and star formation across cosmic time
• Disentangling the AGN and Star-Formation Contributions to the Radio-X-ray Emission of Radio-Loud Quasars at 1<z<2
• Starburst-driven superwinds in quasar host galaxies
• The near-infrared SED of blue quasars: what drives the evolution of the dusty torus?
• The GLEAMing of the first supermassive black holes: II. A new sample of high-redshift radio galaxy candidates
• Mapping feedback signatures in 3C 297: A quasar-host merger at Cosmic Noon