High-energy neutrino emission from the core of low luminosity AGNs triggered by magnetic reconnection acceleration

Khiali, B.; Pino, E. M. de Gouveia Dal

doi:10.1093/mnras/stv2337

Cited by 40 publications

(40 citation statements)

References 68 publications

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“…Rieger & Aharonian (2009) propose that CenA is dominated by ADAF emission, which they use to predict that CenA might be a source of TeV photons and ultra-high-energy (UHE) cosmic rays. While the latter claim is disputed in the literature (Petropoulou et al 2014, who instead favor a twozone SSC model,with UHE particles emerging from the lobes, but see also Khiali et al 2015 for a model using magnetic reconnection to produce γ-rays), a large ADAF can explain the observed hard X-ray properties. Typical temperatures for the electrons in an ADAF Comptonization plasma are on the order of 100 keV, in good agreement with our measurement.…”

Section: The Geometry and Physics Of The X-ray Coronamentioning

confidence: 99%

NuSTAR AND XMM-NEWTON OBSERVATIONS OF THE HARD X-RAY SPECTRUM OF CENTAURUS A

Fürst

Müller

Madsen

et al. 2016

ApJ

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We present simultaneous XMM-Newton and Nuclear Spectroscopic Telescope Array (NuSTAR) observations spanning 3-78 keV of the nearest radio galaxy, CentaurusA (Cen A). The accretion geometry around the central engine in CenA is still debated, and we investigate possible configurations using detailed X-ray spectral modeling. NuSTAR imaged the central region of CenA with subarcminute resolution at X-ray energies above 10 keV for the first time, but found no evidence for an extended source or other off-nuclear point sources. The XMM-Newton and NuSTAR spectra agree well and can be described with an absorbed power law with a photon index Γ=1.815±0.005 and a fluorescent Fe Ka line in good agreement with literature values. The spectrum does not require a high-energy exponential rollover, with a constraint of E fold >1 MeV. A thermal Comptonization continuum describes the data well, with parameters that agree with values measured by INTEGRAL, in particular an electron temperature kT e between ≈100-300 keV and seed photon input temperatures between 5 and 50 eV. We do not find evidence for reflection or a broad iron line and put stringent upper limits of R<0.01 on the reflection fraction and accretion disk illumination. We use archival Chandra data to estimate the contribution from diffuse emission, extra-nuclear point sources, and the outer X-ray jet to the observed NuSTAR and XMM-Newton X-ray spectra and find the contribution to be negligible. We discuss different scenarios for the physical origin of the observed hard X-ray spectrum and conclude that the inner disk is replaced by an advection-dominated accretion flow or that the X-rays are dominated by synchrotron self-Compton emission from the inner regions of the radio jet or a combination thereof.

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Section: The Geometry and Physics Of The X-ray Coronamentioning

confidence: 99%

NuSTAR AND XMM-NEWTON OBSERVATIONS OF THE HARD X-RAY SPECTRUM OF CENTAURUS A

Fürst

Müller

Madsen

et al. 2016

ApJ

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“…(13). This is relevant for exploring reconnection events in the corona and jet launching regions of the black hole [21,[39][40][41][42][43].…”

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confidence: 99%

Relativistic Magnetic Reconnection in Kerr Spacetime

Asenjo

Comisso

2017

Phys. Rev. Lett.

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The magnetic reconnection process is analyzed for relativistic magnetohydrodynamical plasmas around rotating black holes. A simple generalization of the Sweet-Parker model is used as a first approximation to the problem. The reconnection rate, as well as other important properties of the reconnection layer, have been calculated taking into account the effect of spacetime curvature. Azimuthal and radial current sheet configurations in the equatorial plane of the black hole have been studied, and the case of small black hole rotation rate has been analyzed. For the azimuthal configuration, it is found that the black hole rotation decreases the reconnection rate. On the other hand, in the radial configuration, it is the gravitational force created by the black hole mass that decreases the reconnection rate. These results establish a fundamental interaction between gravity and magnetic reconnection in astrophysical contexts.Introduction.-The rapid conversion of magnetic energy into plasma particle energy through the process of magnetic reconnection is of paramount importance in many astrophysical processes [1]. Magnetospheric substorms, coronal mass ejections, stellar and gamma-ray flares are just a few examples of pheneomena in which magnetic reconnection is thought to play a crucial role.In recent years, significant work has been undertaken to better understand magnetic reconnection in magnetically dominated environments, where relativistic effects become significant [2]. This has led to the generalization of the classical Sweet-Parker and Petschek reconnection models to the special relativistic regime [3,4]. Furthermore, many numerical campaigns have been devoted to the investigation of the reconnection rate [5][6][7][8][9][10][11][12] and the particle acceleration [13][14][15][16][17][18][19][20] in this regime. Relativistic reconnection has been found to be a very efficient mechanism of magnetic energy conversion and particle acceleration, making it a primary candidate to explain nonthermal emissions from pulsar wind nebulae, gamma-ray bursts, and active galactic nuclei.While special relativistic effects on the reconnection process are starting to become clear, the effects related to the spacetime curvature are far less explored and a detailed understanding is lacking. General relativistic magnetohydrodynamic simulations have repeatedly shown the formation of reconnection layers in proximity of blacks holes [21][22][23][24], where spacetime curvature effects can be important. However, the difficulties related to the spatial and temporal resolution of typical reconnection processes have been such to prevent their thorough study.A step forward in the comprehension of magnetic reconnection in curved spacetime could be taken by studying simple generalizations of known theoretical models. It is the purpose of this Letter to develop such theoretical study considering the contribution of the gravitational

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“…In more speculative basis, it has been argued that this emission could be potentially explained as due to core emission from LLAGNs distributed between 0 and 5.2 redshifts [54].…”

Section: Discussionmentioning

confidence: 99%

“…The same acceleration model has been also recently applied to explain the high energy extragalactic neutrinos observed by the IceCube at TeV energies. Based on the results of [13], we have shown that protons accelerated in the core region of radio galaxies distributed between redshifts 0 and ∼ 5.2, can produce the observed flux of neutrinos via the decay of charged pions produced by the photomeson process suffered by accelerated protons in these sources [54]. …”

Section: Pos(frapws2016)056mentioning

confidence: 99%

Magnetic Reconnection on Jet-Accretion Disk Systems

Pino¹,

Valle²,

Kadowaki³

et al. 2017

Proceedings of Frontier Research in Astrophysics – II — PoS(FRAPWS2016)

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Fast Magnetic Reconnection is currently regarded as an important process also beyond the solar system, specially in magnetically dominated regions of galactic and extragalactic sources like the surrounds of black holes and relativistic jets. In this lecture we discuss briefly the theory of fast magnetic reconnection, specially when driven by turbulence which is very frequent in Astrophysical flows, and its implications for relativistic particle acceleration. Then we discuss these processes in the context of the sources above, showing recent analytical and multidimensional numerical MHD studies that indicate that fast reconnection can be a powerful process to accelerate particles to relativistic velocities, produce the associated high energy non-thermal emission, and account for efficient conversion of magnetic into kinetic energy in these flows.

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High-energy neutrino emission from the core of low luminosity AGNs triggered by magnetic reconnection acceleration

Cited by 40 publications

References 68 publications

NuSTAR AND XMM-NEWTON OBSERVATIONS OF THE HARD X-RAY SPECTRUM OF CENTAURUS A

NuSTAR AND XMM-NEWTON OBSERVATIONS OF THE HARD X-RAY SPECTRUM OF CENTAURUS A

Relativistic Magnetic Reconnection in Kerr Spacetime

Magnetic Reconnection on Jet-Accretion Disk Systems

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