TANAMI blazars in the IceCube PeV-neutrino fields

Krauß, F.; Kadler, M.; Mannheim, K.; Schulz, R.; Trüstedt, J.; Wilms, J.; Ojha, R.; Ros, E.; Anton, G.; Baumgartner, W. H.; Beuchert, T.; Blanchard, J.; Bürkel, C.; Carpenter, B.; Eberl, T.; Edwards, Philip; Eisenacher, D.; Elsässer, Dominik; Fehn, K.; Fritsch, U.; Gehrels, N.; Gräfe, C.; Großberger, C.; Häse, H.; Horiuchi, S.; James, C. W.; Kappes, A.; Katz, U.; Kreikenbohm, A.; Kreykenbohm, I.; Langejahn, M.; Leiter, K.; Litzinger, E.; Lovell, J. E. J.; Müller, C.; Phillips, Chris; Plötz, Christian; Quick, J.; Steinbring, T.; Stevens, J.; Thompson, D. J.; Tzioumis, A. K.

doi:10.1051/0004-6361/201424219

Cited by 65 publications

(82 citation statements)

References 46 publications

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“…Due to the steeply falling background towards higher energies, the PeV events are the most likely ones in this sample of events to be of extraterrestrial origin. Using contemporaneous TANAMI multiwavelength data, we investigated the six radio-and γ-ray brightest blazars located in the median angular resolution uncertainty circles reported by the IceCube collaboration for the first two PeV neutrino events, dubbed "Ernie" and "Bert" (Krauß et al 2014). Our VLBI images revealed typical blazar morphologies for most candidate sources with high-brightnesstemperature radio cores and typically one-sided jets indicative of strong differential Doppler boosting.…”

Section: Neutrino Emission Of Radio-loud Agnmentioning

confidence: 99%

“…VLBI images of the extended TANAMI sample have been published as part of several TANAMI studies (Müller et al 2011;Blanchard et al 2012a;Müller et al 2013;Müller 2014;Müller et al 2014a;Müller et al 2014b;Krauß et al 2014;Krauß et al 2015) or as supplementary data in multiwavelength studies of the Fermi /LAT collaboration (Abdo et al 2009a;Abdo et al 2010c;Abdo et al 2010d;Buson et al 2014). Data from the TANAMI ATCA program were used in Fermi /LAT multiwavelength publications on the TANAMI sources PKS B 2123-463 and PKS B 2142-758 (D'Ammando et al 2012Dutka et al 2013).…”

Section: The (Sub-)parsec-scale Structure and Dynamics Of Agn Jetsmentioning

confidence: 99%

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TANAMI: Multiwavelength and multimessenger observations of active galaxies

2015

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Extragalactic jets launched from the immediate vicinity of supermassive black holes in radio-loud active galactic nuclei (AGN) are key objects in modern astronomy and astroparticle physics. AGN jets carry a fraction of the total gravitational energy released during the accretion of matter onto supermassive black holes and are prime suspects as possible sources of ultrahigh-energy cosmic rays and the recently detected extraterrestrial neutrinos at PeV energies. TANAMI (Tracking Active galactic Nuclei with Austral Milliarcsecond Interferometry) is a multiwavelength program monitoring AGN jets of the southern sky. It combines high-resolution imaging and spectral monitoring at radio wavelengths with higher-frequency observations at IR, optical/UV, X-ray, and γ-ray energies. We review recent results of the TANAMI program, highlighting AGN candidate neutrino-emitters in the error circles of the IceCube PeV neutrino events.

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Section: Neutrino Emission Of Radio-loud Agnmentioning

confidence: 99%

Section: The (Sub-)parsec-scale Structure and Dynamics Of Agn Jetsmentioning

confidence: 99%

TANAMI: Multiwavelength and multimessenger observations of active galaxies

2015

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“…The six blazars associated with the IC 14 and IC 20 fields by Krauß et al (2014) are listed in Table 1. All exhibit prominent high-energy photon emission, and all but one are classified as flat-spectrum radio quasars (FSRQs; Véron-Cetty & Véron 2006).…”

Section: Target Blazars and Possible Neutrino Fluxesmentioning

confidence: 99%

“…The ability of the ANTARES CLS to probe the PeV-neutrino blazar-origin hypotheses of Krauß et al (2014) can be seen from Fig. 1, which compares the time-integrated, flavour-averaged exposures of the ANTARES CLS (Adrián-Martínez et al 2014a; 1338 days, using one third of the effective area to muon neutrinos) at the characteristic declinations of the six blazars considered here, to that of the IceCube HESE analysis, averaged over the southern hemisphere (IceCube Collaboration 2013; now updated to 998 days by Aartsen et al 2014, averaged over all three neutrino flavours).…”

Section: Antares Candidate List Search and Expected Sensitivitymentioning

confidence: 99%

“…The TANAMI Collaboration has recently reported observations of six bright, variable blazars in positional coincidence with the range of possible arrival directions of the two PeV IceCube events IC 14 and IC 20 (Krauß et al 2014) 1 . Using a simple calculation based on the observed 1 keV to 10 GeV photon flux, the authors estimate that 1.9 ± 0.4 electron neutrino events at PeV energies would be expected in 662 days of IceCube data.…”

Section: Introductionmentioning

confidence: 99%

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ANTARES constrains a blazar origin of two IceCube PeV neutrino events

Adrián-Martínez

Albert

André

et al. 2015

A&A

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Context. The source(s) of the neutrino excess reported by the IceCube Collaboration is unknown. The TANAMI Collaboration recently reported on the multiwavelength emission of six bright, variable blazars which are positionally coincident with two of the most energetic IceCube events. Objects like these are prime candidates to be the source of the highest-energy cosmic rays, and thus of associated neutrino emission. Aims. We present an analysis of neutrino emission from the six blazars using observations with the ANTARES neutrino telescope. Methods. The standard methods of the ANTARES candidate list search are applied to six years of data to search for an excess of muons -and hence their neutrino progenitors -from the directions of the six blazars described by the TANAMI Collaboration, and which are possibly associated with two IceCube events. Monte Carlo simulations of the detector response to both signal and background particle fluxes are used to estimate the sensitivity of this analysis for different possible source neutrino spectra. A maximum-likelihood approach, using the reconstructed energies and arrival directions of through-going muons, is used to identify events with properties consistent with a blazar origin. Results. Both blazars predicted to be the most neutrino-bright in the TANAMI sample (1653−329 and 1714−336) have a signal flux fitted by the likelihood analysis corresponding to approximately one event. This observation is consistent with the blazar-origin hypothesis of the IceCube event IC 14 for a broad range of blazar spectra, although an atmospheric origin cannot be excluded. No ANTARES events are observed from any of the other four blazars, including the three associated with IceCube event IC20. This excludes at a 90% confidence level the possibility that this event was produced by these blazars unless the neutrino spectrum is flatter than −2.4.Key words. neutrinos -galaxies: active -quasars: general

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On the angular distribution of IceCube high‐energy events

Marcos¹,

Marcos²

2015

Astron Nachr

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The detection of high-energy astrophysical neutrinos of extraterrestrial origin by the IceCube neutrino observatory in Antarctica has opened a unique window to the cosmos that may help to probe both the distant Universe and our cosmic backyard. The arrival directions of these high-energy events have been interpreted as uniformly distributed on the celestial sphere. Here, we revisit the topic of the putative isotropic angular distribution of these events applying Monte Carlo techniques to investigate a possible anisotropy. A modest evidence for anisotropy is found. An excess of events appears projected towards a section of the Local Void, where the density of galaxies with radial velocities below 3000 km/s is rather low, suggesting that this particular group of somewhat clustered sources are located either very close to the Milky Way or perhaps beyond 40 Mpc. The results of further analyses of the subsample of southern hemisphere events favour an origin at cosmological distances with the arrival directions of the events organized in a fractal-like structure. Although a small fraction of closer sources is possible, remote hierarchical structures appear to be the main source of these very energetic neutrinos. Some of the events may have their origin at the IBEX ribbon.Comment: 8 pages, 6 figures, 1 table. Astronomische Nachrichten, 336, 657-664 (September 2015). Minor correction

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TANAMI blazars in the IceCube PeV-neutrino fields

Cited by 65 publications

References 46 publications

TANAMI: Multiwavelength and multimessenger observations of active galaxies

TANAMI: Multiwavelength and multimessenger observations of active galaxies

ANTARES constrains a blazar origin of two IceCube PeV neutrino events

On the angular distribution of IceCube high‐energy events

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