Star formation in z>1 3CR host galaxies as seen by Herschel

We present Herschel (PACS and SPIRE) far-infrared (FIR) photometry of a complete sample of z>1 3CR sources, from the Herschel GT project The Herschel Legacy of distant radio-loud AGN (PI: Barthel). Combining these with existing Spitzer photometric data, we perform an infrared (IR) spectral energy distribution (SED) analysis of these landmark objects in extragalactic research to study the star formation in the hosts of some of the brightest active galactic nuclei (AGN) known at any epoch. Accounting for the contribution from an AGN-powered warm dust component to the IR SED, about 40% of our objects undergo episodes of prodigious, ULIRG-strength star formation, with rates of hundreds of solar masses per year, coeval with the growth of the central supermassive black hole. Median SEDs imply that the quasar and radio galaxy hosts have similar FIR properties, in agreement with the orientation-based unification for radio-loud AGN. The star-forming properties of the AGN hosts are similar to those of the general population of equally massive non-AGN galaxies at comparable redshifts, thus there is no strong evidence of universal quenching of star formation (negative feedback) within this sample. Massive galaxies at high redshift may be forming stars prodigiously, regardless of whether their supermassive black holes are accreting or not.Comment: 30 pages, 13 figures, 4 tables. Accepted for publication in A&

A strategy for code validation in high Mach number flows : the experimentalist point of view

Communication to : West-East high speed flow field conference 2002, Marseille (France), April 22-24, 2002SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.2002 n.75 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Starbursts and dusty tori in distant 3CR radio galaxies

© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.We present a study of the complete ultraviolet to submillimetre spectral energy distributions (SEDs) of 12 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 active galactic nuclei (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 1013 L?) young stellar populations with ages of several hundred million years in hosts with masses exceeding 1011 M?. 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

ALMA Resolves the Stellar Birth Explosion in Distant Quasar 3C298

Galaxies are believed to experience star formation and black-hole-driven nuclear activity symbiotically. The symbiosis may be more extreme in the distant universe, as far-infrared photometry with the Herschel Space Observatory has found many cases of ultraluminous cool dust emission in z > 1 radio galaxies and quasars, which could have its origin in the central black hole activity, or in extreme starbursts. We here present strong evidence for an extreme circumnuclear starburst in the z = 1.439 quasar 3C298. Our unparalleled 0.18 arcsec resolution Atacama Large Millimeter/submillimeter Array (ALMA) image at rest-frame 410 mu m wavelength shows that the similar to 40 K dust in its host galaxy resides in an asymmetric circumnuclear structure. The morphology of this structure implies a starburst origin and a symbiotic physical relation with the active-galactic-nucleus-driven radio source. The symbiosis is likely to be a general property of distant massive galaxies

Etude mathetique d'equations aux derivees partielles de la physique a valeurs dans une variete

SIGLEINIST T 73388 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

z<1 3CR radio galaxies and quasars star formation

VizieR online Data Catalogue associated with article published in journal Astronomical Journal (AAS) with title 'Star formation in 3CR radio galaxies and quasars at z<1.' (bibcode: 2016AJ....151..120W

Star formation in z > 1 3CR host galaxies as seen by Herschel

We present Herschel (PACS and SPIRE) far-infrared (FIR) photometry of a complete sample of z> 1 3CR sources, from the Herschel guaranteed time project The Herschel Legacy of distant radio-loud AGN. Combining these with existing Spitzer photometric data, we perform an infrared (IR) spectral energy distribution (SED) analysis of these landmark objects in extragalactic research to study the star formation in the hosts of some of the brightest active galactic nuclei (AGN) known at any epoch. Accounting for the contribution from an AGN-powered warm dust component to the IR SED, about 40% of our objects undergo episodes of prodigious, ULIRG-strength star formation, with rates of hundreds of solar masses per year, coeval with the growth of the central supermassive black hole. Median SEDs imply that the quasar and radio galaxy hosts have similar FIR properties, in agreement with the orientation-based unification for radio-loud AGN. The star-forming properties of the AGN hosts are similar to those of the general population of equally massive non-AGN galaxies at comparable redshifts, thus there is no strong evidence of universal quenching of star formation (negative feedback) within this sample. Massive galaxies at high redshift may be forming stars prodigiously, regardless of whether their supermassive black holes are accreting or not.Astronom

FIR photometry of 3CR galaxies

VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Star formation in z>1 3CR host galaxies as seen by Herschel.' (bibcode: 2015A&A...575A..80P