Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1<z<4

Abstract

High-redshift radio galaxies present signs of both star formation and AGN activity, making them ideal candidates to investigate the connection and coevolution of AGN and star formation in the progenitors of present-day massive galaxies. We make use of a sample of 11 powerful radio galaxies spanning 1<z<4 which have complete coverage of their spectral energy distribution (SED) from UV to FIR wavelengths. Using Herschel data, we disentangle the relative contribution of the AGN and star formation by combining the galaxyevolutioncodePEGASE.3 with an AGN torus model. We find that three components are necessary to reproduce the observed SEDs: an evolved and massive stellar component, a submm bright young starburst, and an AGN torus. We find that powerful radio galaxies form at very high-redshift, but experience episodic and important growth at 1<z<4 as the mass of the associated starburst varies from 5 to 50% of the total mass of the system. The properties of star formation differ from source to source, indicating no general trend of the star formation properties in the most infrared luminous high-redshift radio galaxies and no correlation with the AGN bolometric luminosity. Moreover, we find that AGN scattered light have a very limited impact on broad-band SED fitting on our sample. Finally, our analysis also suggests a wide range in origins for the observed star formation,which we partially constrain for some sources.

References in corpus (21)

• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• AGN Dusty Tori: I. Handling of Clumpy Media
• Distant Radio Galaxies and their Environments
• The Mean Star Formation Rate of X-ray selected Active Galaxies and its Evolution from z=2.5: Results from PEP-Herschel
• The Large APEX Bolometer Camera LABOCA
• Modelling the Pan-Spectral Energy Distribution of Starburst Galaxies: IV The Controlling Parameters of the Starburst SED
• Radiative Transfer Modeling of Three-Dimensional Clumpy AGN Tori and its Application to NGC 1068
• Constraining the properties of AGN host galaxies with Spectral Energy Distribution modeling
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• The Spiderweb galaxy: a forming massive cluster galaxy at z~2
• An ALMA Survey of Submillimeter Galaxies in the Extended Chandra Deep Field South: Near-infrared morphologies and stellar sizes
• Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
• Detection of Two Massive CO Systems in 4C 41.17 at z = 3.8
• VIMOS-VLT spectroscopy of the giant Ly-alpha nebulae associated with three z~2.5 radio galaxies
• Interferometric imaging of the high-redshift radio galaxy, 4C60.07: An SMA, Spitzer and VLA study reveals a binary AGN/starburst
• Wide-field mid-infrared and millimetre imaging of the high-redshift radio galaxy, 4C41.17
• The growth and assembly of a massive galaxy at z ~ 2
• Jet-gas interactions in z~2.5 radio galaxies: evolution of the ultraviolet line and continuum emission with radio morphology
• Near- and mid-infrared photometry of high-redshift 3CR sources
• Imaging and Spectroscopy of Ultra Steep Spectrum Radio Sources
• Adaptive Optics Rest-Frame V-band Imaging of Lyman Break Galaxies at z~3: High-surface Density Disk-like Galaxies ?

Cited by in corpus (14)

• The mean star formation rates of unobscured QSOs: searching for evidence of suppressed or enhanced star formation
• 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?
• Local positive feedback in the overall negative: the impact of quasar winds on star formation in the FIRE cosmological simulations
• A cosmic stream of atomic carbon gas connected to a massive radio galaxy at redshift 3.8
• Quenching by gas compression and consumption: A case study of a massive radio galaxy at z = 2.57
• JWST's PEARLS: TN J1338-1942 -- I. Extreme jet triggered star-formation in a $z=4.11$ luminous radio galaxy
• A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed by High-z Radio Galaxies at z~4
• The Milky Way like galaxy NGC 6384 and its nuclear star cluster at high NIR spatial resolution using LBT/ARGOS commissioning data
• The Dragonfly Galaxy. III. Jet-brightening of a High-redshift Radio Source Caught in a Violent Merger of Disk Galaxies
• The GLEAMing of the first supermassive black holes: II. A new sample of high-redshift radio galaxy candidates
• ALMA detects molecular gas in the halo of the powerful radio galaxy TXS 0828+193
• The Nature and Likely Redshift of GLEAM J0917-0012
• Hosts and environments: a (large-scale) radio history of AGN and star-forming galaxies