The Suzaku view of the disk-jet connection in the low-excitation radio galaxy NGC 6251

D.A. Evans; R.P. Kraft; J.C. Lee; A.C. Summers; M.J. Hardcastle; P. Gandhi; J.H. Croston

doi:10.1088/2041-8205/741/1/L4

The Suzaku view of the disk-jet connection in the low-excitation radio galaxy NGC 6251

D.A. Evans, R.P. Kraft, J.C. Lee, A.C. Summers, M.J. Hardcastle, P. Gandhi, J.H. Croston

Centre for Astrophysics Research (CAR)

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Abstract

We present results from an 87 ks Suzaku observation of the canonical low-excitation radio galaxy (LERG) NGC6251. We have previously suggested that LERGs violate conventional active galactic nucleus unification schemes: they may lack an obscuring torus and are likely to accrete in a radiatively inefficient manner, with almost all of the energy released by the accretion process being channeled into powerful jets. We model the 0.5-20keV Suzaku spectrum with a single power law of photon index Γ = 1.82, together with two collisionally ionized plasma models whose parameters are consistent with the known galaxy- and group-scale thermal emission. Our observations confirm that there are no signatures of obscured, accretion-related X-ray emission in NGC 6251, and we show that the luminosity of any such component must be substantially sub-Eddington in nature.

Original language	English
Article number	L4
Number of pages	5
Journal	Astrophysical Journal Letters
Volume	741
Issue number	1
DOIs	https://doi.org/10.1088/2041-8205/741/1/L4
Publication status	Published - Nov 2011

Keywords

galaxies: active
galaxies: jets
galaxies: individual (NGC6251)
X-rays: galaxies

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10.1088/2041-8205/741/1/L4

906058
‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society
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title = "The Suzaku view of the disk-jet connection in the low-excitation radio galaxy NGC 6251",

abstract = "We present results from an 87 ks Suzaku observation of the canonical low-excitation radio galaxy (LERG) NGC6251. We have previously suggested that LERGs violate conventional active galactic nucleus unification schemes: they may lack an obscuring torus and are likely to accrete in a radiatively inefficient manner, with almost all of the energy released by the accretion process being channeled into powerful jets. We model the 0.5-20keV Suzaku spectrum with a single power law of photon index Γ = 1.82, together with two collisionally ionized plasma models whose parameters are consistent with the known galaxy- and group-scale thermal emission. Our observations confirm that there are no signatures of obscured, accretion-related X-ray emission in NGC 6251, and we show that the luminosity of any such component must be substantially sub-Eddington in nature.",

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author = "D.A. Evans and R.P. Kraft and J.C. Lee and A.C. Summers and M.J. Hardcastle and P. Gandhi and J.H. Croston",

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AU - Kraft, R.P.

AU - Lee, J.C.

AU - Summers, A.C.

AU - Hardcastle, M.J.

AU - Gandhi, P.

AU - Croston, J.H.

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PY - 2011/11

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N2 - We present results from an 87 ks Suzaku observation of the canonical low-excitation radio galaxy (LERG) NGC6251. We have previously suggested that LERGs violate conventional active galactic nucleus unification schemes: they may lack an obscuring torus and are likely to accrete in a radiatively inefficient manner, with almost all of the energy released by the accretion process being channeled into powerful jets. We model the 0.5-20keV Suzaku spectrum with a single power law of photon index Γ = 1.82, together with two collisionally ionized plasma models whose parameters are consistent with the known galaxy- and group-scale thermal emission. Our observations confirm that there are no signatures of obscured, accretion-related X-ray emission in NGC 6251, and we show that the luminosity of any such component must be substantially sub-Eddington in nature.

AB - We present results from an 87 ks Suzaku observation of the canonical low-excitation radio galaxy (LERG) NGC6251. We have previously suggested that LERGs violate conventional active galactic nucleus unification schemes: they may lack an obscuring torus and are likely to accrete in a radiatively inefficient manner, with almost all of the energy released by the accretion process being channeled into powerful jets. We model the 0.5-20keV Suzaku spectrum with a single power law of photon index Γ = 1.82, together with two collisionally ionized plasma models whose parameters are consistent with the known galaxy- and group-scale thermal emission. Our observations confirm that there are no signatures of obscured, accretion-related X-ray emission in NGC 6251, and we show that the luminosity of any such component must be substantially sub-Eddington in nature.

KW - galaxies: active

KW - galaxies: jets

KW - galaxies: individual (NGC6251)

KW - X-rays: galaxies

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JO - Astrophysical Journal Letters

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The Suzaku view of the disk-jet connection in the low-excitation radio galaxy NGC 6251

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Keywords

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