Extreme host galaxy growth in powerful early-epoch radio galaxies

Abstract

During the first half of the universe's age, a heyday of star-formation must have occurred because many massive galaxies are in place after that epoch in cosmic history. Our observations with the revolutionary Herschel Space Observatory reveal vigorous optically obscured star-formation in the ultra-massive hosts of many powerful high-redshift 3C quasars and radio galaxies. This symbiotic occurrence of star-formation and black hole driven activity is in marked contrast to recent results dealing with Herschel observations of X-ray selected active galaxies. Three archetypal radio galaxies, at redshifts 1.132,1.575, and 2.474 are presented here, with inferred star-formation rates of hundreds of solar masses per year. A series of spectacular coeval AGN/starburst events may have formed these ultra-massive galaxies and their massive central black holes during their relatively short lifetimes.

To appear in Astrophysical Journal Letters

References in corpus (6)

• The Galaxy Mass Function up to z=4 in the GOODS-MUSIC sample: into the epoch of formation of massive galaxies
• The suppression of star formation by powerful active galactic nuclei
• Spitzer Reveals Hidden Quasar Nuclei in Some Powerful FR II Radio Galaxies
• Chandra Multiwavelength Project X-ray Point Source Number Counts and the Cosmic X-ray Background
• Near- and mid-infrared photometry of high-redshift 3CR sources
• Mid-Infrared Spectra of High Redshift (z>2) Radio Galaxies

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• Herschel-ATLAS/GAMA: What determines the far-infrared properties of radio-galaxies?
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