The X-ray nuclei of intermediate-redshift radio sources

  title={The X-ray nuclei of intermediate-redshift radio sources},
  author={Martin J. Hardcastle and Dalland Evans and Judith H. Croston},
  journal={Monthly Notices of the Royal Astronomical Society},
We present a Chandra and XMM-Newtonspectral analysis of the nuclei of the radio galaxies and radio-loud quasars from the 3CRR sample in the redshift range 0.1 < z < 0.5. In the range of radio luminosity sampled by these objects, mostly FRIIs, it has been clear for some time that a population of radio galaxies (‘low-excitation radio galaxies’) cannot easily participate in models that unify narrow-line radio galaxie s and broad-line objects. We show that low-excitation and narrow-line radio… 

Figures and Tables from this paper

The active nuclei of z < 1.0 3CRR radio sources
We combine Chandraand XMM-NewtonX-ray data from our previous papers with new X-ray observations and with Spitzer mid-infrared data in order to study the nature of the nuclei o f radio galaxies and
High‐redshift Fanaroff–Riley type II radio sources: large‐scale X‐ray environment
We investigate the properties of the environment around 20 powerful radio galaxies and quasars at redshifts between 0.45 and 1. Using XMM-Newton and Chandra observations we probe the spatial
The dependence of X-ray AGN activity on host galaxy properties and environment
There is mounting evidence that active galactic nuclei (AGN) selected through optical emission lines or radio luminosities comprise two distinct AGN populations, whose activity is triggered by
Hard X-ray-selected giant radio galaxies – I. The X-ray properties and radio connection
We present the first broad-band X-ray study of the nuclei of 14 hard X-ray-selected giant radio galaxies, based both on the literature and on the analysis of archival X-ray data from NuSTAR,
Observed properties of FRII quasars and radio galaxies at z < 1.0
In a long-term observing project we have imaged a complete sample of FRII quasars and radio galaxies with z < 1.0 at high resolution and high sensitivity with the VLA and MERLIN. This sample of 98
Herschel-ATLAS: far-infrared properties of radio-selected galaxies
We use the Herschel-Astrophysical Terahertz Large Area Survey (ATLAS) science demonstration data to investigate the star formation properties of radio-selected galaxies in the GAMA-9h field as a
The X-ray emission of the most luminous 3CR radio sources
Context. Although many radio-loud quasars and galaxies have been observed in X-rays, systematic studies of well defined samples are rare. Aims. We investigate the X-ray properties of the most
3C 33: another case of photoionized soft X-ray emission in radio galaxies
All the observations available in the Chandra and XMM-Newton archives have been used to investigate the X-ray spectral properties of 3C 33. In this paper is presented a complete X-ray analysis of the
Radio jets in galaxies with actively accreting black holes : new insights from the SDSS
In the local Universe, the majority of radio-loud active galactic nuclei (AGN) are found in massive elliptical galaxies with old stellar populations and weak or undetected emission lines. At high
Testing black hole jet scaling relations in low-luminosity active galactic nuclei
We present the results of the analysis of a sample of 17 low-luminosity (LX 10 42 erg s −1 ), radio-loud active galactic nuclei in massive galaxies. The sample is extracted from the Sloan Digital Sky


An X-Ray Spectral Survey of Radio-loud Active Galactic Nuclei with ASCA
We present a uniform and systematic analysis of the 0.6-10 keV X-ray spectra of radio-loud active galactic nuclei (AGNs) observed by ASCA. The sample, which is not statistically complete, includes 10
Radio, optical and X-ray nuclei in nearby 3CRR radio galaxies
HST observations have shown that low-redshift 3CR radio galaxies often exhibit a point-like optical component positionally coincident with the GHz-frequency radio core. In this paper we discuss the
X-ray observations of low-power radio galaxies from the B2 catalogue
We present an analysis of X-ray data, taken with ROSAT, for a well defined sample of low-power radio galaxies from the Bologna B2 catalogue. Where possible, the HRI has been used in order to take
The nuclear radio-optical properties of intermediate-redshift FR II radio galaxies and quasars
We extend the study of the nuclei of 3CR objects as seen with the HST to higher-redshift FR II radio sources (0.4 < z < 0.6). Our results reflect what has been found for FR II of lower redshift. The
The ASCA X-ray spectrum of the powerful radio galaxy 3C 109
ABSTRACT We report the results from an ASCA X-ray observation of the powerful Broad LineRadio Galaxy, 3C109. The ASCA spectra confirm our earlier ROSAT detection ofintrinsic X-ray absorption
High-redshift Faranoff-Riley type II radio galaxies: X-ray properties of the cores
We present an extensive X-ray spectral analysis of the cores of 19 Faranoff-Riley type II sources in the redshift range 0.5 < z < 1.0 which were selected to be matched in isotropic radio power. The
Obscuration and origin of nuclear x-ray emission in Fr I radio galaxies
We present X-ray observations of the nuclear region of 25 Fanaroff-Riley type I (FR I) radio galaxies from the 3CRR and B2 catalogs, using data from the Chandra and XMM-Newton archives. We find the
Chandra and Xmm-Newton observations of a sample of low-redshift FR I and FR II radio galaxy nuclei
We present spectral results from Chandra and XMM-Newton observations of a sample of 22 low-redshift (z < 0.1) radio galaxies and consider whether the core emission originates from the base of a
X-ray emission from the nuclei, lobes and hot-gas environments of two FR II radio galaxies
We report on the detection of multiple components of X-ray emission from the two FR II radio galaxies, 3C 223 and 3C 284, based on new XMM-Newton observations. We attribute the detected X-ray
The Chandra view of the 3C/FR I sample of low luminosity radio-galaxies
We present results from Chandra observations of the 3C/FR I sample of low luminosity radio-galaxies. We detected a power-law nuclear component in 12 objects out of the 18 with available data. In 4