Extended inverse-Compton emission from distant, powerful radio galaxies

Erlund, Mary; Fabian, A. C.; Blundell, Katherine M.; Celotti, A.; Crawford, C. S.

doi:10.1111/j.1365-2966.2006.10660.x

Cited by 61 publications

(78 citation statements)

References 47 publications

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“…If we assume that the observed X‐rays are ICCMB photons, we can follow equation 4 of Erlund et al (2006) to estimate the total energy in relativistic particles from the X‐ray flux alone: where L 44 is the X‐ray luminosity in 10 44 erg s −1 and γ e is the typical Lorentz factor of the electrons up‐scattering the CMB to X‐rays. Setting γ e = 10 3 gives for MRC 2216−206.…”

Section: Mrc Sourcesmentioning

confidence: 99%

“…Together with radio observations, ICCMB X‐ray fluxes can be used to constrain the local magnetic field experienced by the radio‐emitting plasma in the lobes of giant FR II (Fanaroff & Riley 1974) radio sources (see e.g. Erlund et al 2006). Previous observations of ICCMB X‐rays from radio galaxies have found deviations of the observed magnetic field from predictions based on equipartition arguments (see Croston et al 2005, and references therein).…”

Section: Introductionmentioning

confidence: 99%

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Inverse-Compton X-rays from giant radio galaxies atz∼ 1

Laskar¹,

Fabian²,

Blundell³

et al. 2010

Monthly Notices of the Royal Astronomical Society

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We report XMM–Newton observations of three FR II radio galaxies at redshifts between 0.85 and 1.34, which show extended diffuse X‐ray emission within the radio lobes, likely due to inverse‐Compton up‐scattering of the cosmic microwave background. Under this assumption, through spectrum fitting together with archival Very Large Array radio observations, we derive an independent estimate of the magnetic field in the radio lobes of 3C 469.1 and compare it with the equipartition value. We find concordance between these two estimates as long as the turnover in the energy distribution of the particles occurs at a Lorentz factor in excess of ∼250. We determine the total energy in relativistic particles in the radio‐emitting lobes of all three sources to range between 3 × 1059 and 8 × 1059 erg. The nuclei of these X‐ray sources are heavily‐absorbed powerful active galactic nuclei.

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Section: Mrc Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inverse-Compton X-rays from giant radio galaxies atz∼ 1

Laskar¹,

Fabian²,

Blundell³

et al. 2010

Monthly Notices of the Royal Astronomical Society

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“…Interesting cases of relic emission identified from X-ray observations include the radio galaxies Cygnus A [10,11], 3C294 [12] and 4C23.56 [46].…”

Section: Introductionmentioning

confidence: 99%

Episodic Activity in Active Galactic Nuclei

Saikia¹,

Jamrozy²,

Konar³

et al. 2011

Proceedings of 25th Texas Symposium on Relativistic Astrophysics — PoS(Texas 2010)

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There is increasing evidence to suggest that AGN activity may be episodic, with a wide range of possible time scales. Radio galaxies exhibit the most striking examples of episodic activity, with two or three distinct pairs of lobes on opposite sides of the active nucleus. Radio emission from earlier cycles of activity are expected to have steep radio spectra due to radiative losses, and hence be detected more easily at low radio frequencies. Inverse-Compton scattered cosmic microwave background radiation could in prinicple probe even lower Lorentz-factor particles, revealing an older population. We illustrate the time scales of episodic activity by considering different radio galaxies, discuss the possiblity of episodic activity in cluster radio sources, and a possible trend for a high incidence of HI absorption in sources with evidence of episodic activity.

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“…Most of the power in jets -which derives from the angular momentum of the BH -is eventually converted into thermal and kinetic energy, with a maximum power of ∼ a 2Ṁ c 2 where a is the BH spin parameter andṀ the mass accretion rate (Blandford & Znajek 1977;Tchekhovskoy & McKinney 2012). Indeed, AGN jets have been observed in clusters to drive super-bubbles, some with estimated energetics that reach >10 62 erg (Erlund et al 2006;Fabian et al 2014). While it is thought that jets do not normally exist during the radiatively efficient quasar state (although see Shaw et al 2012;Ruan et al 2014), they are more commonly associated with less efficient accretion states that may have occurred at earlier times.…”

Section: Implications For Quasar Feedbackmentioning

confidence: 99%

DETECTION OF QUASAR FEEDBACK FROM THE THERMAL SUNYAEV–ZEL’DOVICH EFFECT INPLANCK

Ruan

McQuinn

Anderson

2015

ApJ

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Poorly understood feedback processes associated with highly-luminous black hole accretion in quasars may dramatically affect the properties of their host galaxies. We search for the effect of quasar feedback on surrounding gas using Planck maps of the thermal Sunyaev-Zel'dovich effect (tSZ). By stacking tSZ Compton-y maps centered on the locations of 26,686 spectroscopic quasars from the Sloan Digital Sky Survey, we detect a strong but unresolved tSZ Compton-y signal at >5σ significance that likely originates from a combination of virialized halo atmosphere gas and quasar feedback effects. We show that the feedback contribution to our detected quasar tSZ signal is likely to dominate over virialized halo gas by isolating the feedback tSZ component for high-and low-redshift quasars. We find that this quasar tSZ signal also scales with black hole mass and bolometric luminosity, all consistent with general expectations of quasar feedback. We estimate the mean angularly-integrated Compton-y of quasars at z 1.5 to be 3.5×10 −6 Mpc 2 , corresponding to mean total thermal energies in feedback and virialized halo gas of 1.1 (±0.2) × 10 62 erg, and discuss the implications for quasar feedback. If confirmed, the large total thermal feedback energetics we estimate of 5% (±1% statistical uncertainty) of the black hole mass will have important implications for the effects of quasar feedback on the host galaxy, as well as the surrounding intergalactic medium.

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Extended inverse-Compton emission from distant, powerful radio galaxies

Cited by 61 publications

References 47 publications

Inverse-Compton X-rays from giant radio galaxies atz∼ 1

Inverse-Compton X-rays from giant radio galaxies atz∼ 1

Episodic Activity in Active Galactic Nuclei

DETECTION OF QUASAR FEEDBACK FROM THE THERMAL SUNYAEV–ZEL’DOVICH EFFECT INPLANCK

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