Chandra and Xmm-Newton observations of a sample of low-redshift FR I and FR II radio galaxy nuclei

DA Evans*, DM Worrall, MJ Hardcastle, RP Kraft, M Birkinshaw

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

155 Citations (Scopus)

Abstract

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 relativistic jet, or an accretion flow, or contains contributions from both. We find correlations between the unabsorbed X-ray, radio, and optical fluxes and luminosities of FR I-type radio-galaxy cores, implying a common origin in the form of a jet. On the other hand, we find that the X-ray spectra of FR II-type radio galaxy cores are dominated by absorbed emission, with NH greater than or similar to 10(23) atoms cm(-2), which is likely to originate in an accretion flow. We discuss several models that may account for the different nuclear properties of FR I- and FR II-type cores and also demonstrate that both heavily obscured, accretion-related and unobscured, jet-related components may be present in all radio galaxy nuclei. Any absorbed, accretion-related components in FR I- type galaxies have low radiative efficiencies.

Translated title of the contributionChandra and XMM-Newton observations of a sample of low-redshift FR I and FR II radio galaxy nuclei
Original languageEnglish
Pages (from-to)96-112
Number of pages17
JournalAstrophysical Journal
Volume642
Issue number1
DOIs
Publication statusPublished - 1 May 2006

Bibliographical note

Publisher: University of Chicago Press

Keywords

  • galaxies : active
  • galaxies : jets
  • X-rays : galaxies
  • X-RAY-EMISSION
  • ACTIVE GALACTIC NUCLEI
  • ADVECTION-DOMINATED ACCRETION
  • SUPERMASSIVE BLACK-HOLE
  • UNIFIED SCHEMES
  • CENTAURUS-A
  • CYGNUS-A
  • 3C 390.3
  • ENERGY-DISTRIBUTIONS
  • IONIZED-GAS

Fingerprint Dive into the research topics of 'Chandra and Xmm-Newton observations of a sample of low-redshift FR I and FR II radio galaxy nuclei'. Together they form a unique fingerprint.

Cite this