High-energy cosmic neutrinos from spine-sheath BL Lac jets

Tavecchio, F.; Ghisellini, G.

doi:10.1093/mnras/stv1023

Cited by 89 publications

(97 citation statements)

References 82 publications

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“…90% C.L. upper limits on the (n n + m m ) flux for models of the neutrino emission from (a) generic blazars (Mannheim 1995;Halzen & Zas 1997;Protheroe 1997), (b) BL Lacs (Mücke et al 2003;Padovani et al 2015;Tavecchio & Ghisellini 2015), and (c)+(d) FSRQs (Becker et al 2005;Murase et al 2014). The upper limits include a correction factor that takes into account the flux from unresolved sources (see Appendix C) and systematic uncertainties.…”

Section: Discussionmentioning

confidence: 99%

“…These include the calculations by Mannheim (1995), Halzen & Zas (1997), and Protheroe (1997) for generic blazars; the calculations by Becker et al (2005) and Murase et al (2014) for FSRQs; and the calculations by Mücke et al (2003), Tavecchio et al (2014), Tavecchio & Ghisellini (2015), and Padovani et al (2015) for BL Lacs.…”

Section: Upper Limits On Models For Diffuse Neutrino Emissionmentioning

confidence: 99%

“…For models involving a range of flux predictions, we calculate the MRF with respect to the lower flux of the optimistic templates (Mücke et al 2003) or to constraints on the baryon-tophoton luminosity ratios x CR (Murase et al 2014). a Predictions from Tavecchio et al (2014) and Tavecchio & Ghisellini (2015) enhanced by a factor of 3 in correspondence with the authors. 65 The flux upper limit divided by the flux predicted in the model.…”

Section: Upper Limits On Models For Diffuse Neutrino Emissionmentioning

confidence: 99%

See 2 more Smart Citations

The Contribution of Fermi-2lac Blazars to Diffuse Tev–pev Neutrino Flux

Aartsen¹,

Abraham²,

Ackermann³

et al. 2017

ApJ

256

196

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The recent discovery of a diffuse cosmic neutrino flux extending up to PeV energies raises the question of which astrophysical sources generate this signal. Blazars are one class of extragalactic sources which may produce such high-energy neutrinos. We present a likelihood analysis searching for cumulative neutrino emission from blazars in the 2nd Fermi-LAT AGN catalog (2LAC) using IceCube neutrino data set 2009-12, which was optimized for the detection of individual sources. In contrast to those in previous searches with IceCube, the populations investigated contain up to hundreds of sources, the largest one being the entire blazar sample in the 2LAC catalog. No significant excess is observed, and upper limits for the cumulative flux from these populations are obtained. These constrain the maximum contribution of 2LAC blazars to the observed astrophysical neutrino flux to 27% or less between around 10 TeV and 2 PeV, assuming the equipartition of flavors on Earth and a single power-law spectrum with a spectral index of −2.5. We can still exclude the fact that 2LAC blazars (and their subpopulations) emit more than 50% of the observed neutrinos up to a spectral index as hard as −2.2 in the same energy range. Our result takes into account the fact that the neutrino source count distribution is unknown, and it does not assume strict proportionality of the neutrino flux to the measured 2LAC γ-ray signal for each source. Additionally, we constrain recent models for neutrino emission by blazars.

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Section: Discussionmentioning

confidence: 99%

Section: Upper Limits On Models For Diffuse Neutrino Emissionmentioning

confidence: 99%

Section: Upper Limits On Models For Diffuse Neutrino Emissionmentioning

confidence: 99%

See 1 more Smart Citation

The Contribution of Fermi-2lac Blazars to Diffuse Tev–pev Neutrino Flux

Aartsen¹,

Abraham²,

Ackermann³

et al. 2017

ApJ

256

196

View full text Add to dashboard Cite

show abstract

“…Various extragalactic scenarios have been suggested that might be (partially) responsible for the observed flux of neutrinos. Source candidates include galaxies with intense star formation [28,29,30,31,32,33], cores of active galactic nuclei (AGN) [34,35,36], low-luminosity AGN [37,38], blazars [39,40,41], low-power GRBs [42,43,44], cannonball GRBs [45], intergalactic shocks [46], and active galaxies embedded in structured regions [47,48,29].…”

Section: Pos(icrc2015)022mentioning

confidence: 99%

Multi-Messenger Aspects of Cosmic Neutrinos

Ahlers¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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The recent observation of TeV-PeV neutrinos by IceCube has opened a new window to the highenergy Universe. I will discuss this signal in the context of multi-messenger astronomy. For extragalactic source scenarios the corresponding hadronic gamma-rays are not directly observable due to interactions with the cosmic radiation backgrounds. Nevertheless, the isotropic sub-TeV gamma ray background observed by Fermi-LAT contains indirect information from secondary emission produced in electromagnetic cascades. On the other hand, observation of PeV gamma rays would provide a smoking-gun signal for Galactic emission. Interestingly, the overall energy density of the observed neutrino flux is close to a theoretical limit for neutrino production in ultrahigh energy cosmic ray sources and might indicate a common origin of these phenomena. I will highlight various multi-messenger relations and their implications for neutrino source scenarios.

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“…[3,4] and has since then been explored in a number of studies (see e.g. [5][6][7][8][9]). We perform here detailed statistical studies to test a blazar connection with UHECRs going through high energy neutrinos used as "intermediaries".…”

Section: Introductionmentioning

confidence: 99%

A Novel Study Connecting Ultra-High Energy Cosmic Rays, Neutrinos, and Gamma-Rays

Coenders

Resconi

Padovani

et al. 2018

Proceedings of 2016 International Conference on Ultra-High Energy Cosmic Rays (UHECR2016)

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We present a novel study connecting ultra-high energy cosmic rays, neutrinos, and gamma-rays with the objective to identify common counterparts of the three astrophysical messengers. In the test presented here, we first identify potential hadronic sources by filtering gamma-ray emitters that are in spatial coincidence with IceCube neutrinos. Subsequently, these objects are correlated against ultra-high energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array, scanning in gamma-ray flux and angular separation between sources and cosmic rays. A maximal excess of 80 cosmic rays (41.9 expected) is observed for the second catalog of hard Fermi-LAT objects of blazars of the high synchrotron peak type. This corresponds to a deviation from the nullhypothesis of 2.94σ. No excess is observed for objects not in spatial connection with neutrinos. The gamma-ray sources that make up the excess are blazars of the high synchrotron peak type.

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High-energy cosmic neutrinos from spine-sheath BL Lac jets

Cited by 89 publications

References 82 publications

The Contribution of Fermi-2lac Blazars to Diffuse Tev–pev Neutrino Flux

The Contribution of Fermi-2lac Blazars to Diffuse Tev–pev Neutrino Flux

Multi-Messenger Aspects of Cosmic Neutrinos

A Novel Study Connecting Ultra-High Energy Cosmic Rays, Neutrinos, and Gamma-Rays

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