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Chandra and XMM‐Newton Observations of a Sample of Low‐Redshift FR I and FR II Radio Galaxy Nuclei
Open accessAbstract
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 N H ≳ 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.
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Advection-dominated Accretion: Underfed Black Holes and Neutron Stars
Narayan, R., & Yi, I. (1995) · The Astrophysical Journal · doi:10.1086/176343 · Cited by 1,679
Cited by
Active galactic nuclei: what’s in a name?
Padovani, P., Alexander, D. M., Assef, R. J., De Marco, B., Giommi, P., Hickox, R. C., Richards, G. T., Smolčić, V., Hatziminaoglou, E., Mainieri, V., et al. (2017) · The Astronomy and Astrophysics Review · doi:10.1007/s00159-017-0102-9 · Cited by 666
Metadata
- Authors
- Evans, D. A., Worrall, D. M., Hardcastle, M. J., Kraft, R. P., & Birkinshaw, M.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2006-05
- Volume
- 642
- Issue
- 1
- Pages
- 96-112
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2075503884
- Cited by
- 181
- References
- 1
- FWCI
- 13.11
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Evans, D. A., Worrall, D. M., Hardcastle, M. J., Kraft, R. P., & Birkinshaw, M. (2006). Chandra and XMM‐Newton Observations of a Sample of Low‐Redshift FR I and FR II Radio Galaxy Nuclei. The Astrophysical Journal. https://doi.org/10.1086/500658
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