Detection prospects for high energy neutrino sources from the anisotropic matter distribution in the local Universe

Mertsch, Philipp; Rameez, M.; Tamborra, Irene

doi:10.1088/1475-7516/2017/03/011

Cited by 26 publications

(35 citation statements)

References 118 publications

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“…However, the latest 7.5 years High Energy Starting Events (HESE) have the best-fit γ = 2.89 +0. 20 −0.19 [25]. A spectral index of about 2.3 is in tension with this result.…”

Section: Introductionmentioning

confidence: 77%

Decaying dark matter at IceCube and its signature on High Energy gamma experiments

Chianese

Fiorillo

Miele

et al. 2019

J. Cosmol. Astropart. Phys.

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The origin of neutrino flux observed in IceCube is still mainly unknown. Typically two flux components are assumed, namely: atmospheric neutrinos and an unknown astrophysical term. In principle the latter could also contain a top-down contribution coming for example from decaying dark matter. In this case one should also expect prompt and secondary gamma's as well. This leads to the possibility of a multimessenger analysis based on the simultaneous comparison of the Dark Matter hypothesis both with neutrino and high energy gamma rays data. In this paper, we analyze, for different decaying Dark Matter channels, the 7.5 years IceCube HESE data, and compare the results with previous exclusion limits coming from Fermi data. Finally, we test whether the Dark Matter hypothesis could be further scrutinised by using forthcoming high energy gamma rays experiments. * m.chianese@uva.nl † dfgfiorillo@na.infn.it ‡ miele@na.infn.it § smorisi@na.infn.t ¶ a hard isotropic extragalactic neutrino flux and an additional softer one with a potential galactic origin [27][28][29][30][31][32][33]. This two-component hypothesis is at the same time supported by the first combined analysis of IceCube and ANTARES data [34]. It turns out that both IceCube and ANTARES telescopes have measured in the same energy range (about 40-200 TeV) a slight excess with respect to an astrophysical power-law flux deduced by TG data (γ ≤ 2.2), after the background subtraction [34][35][36][37].An alternative source for this diffuse UHE neutrino flux is decaying Dark Matter (DM) . While another available source might be identified with annihilating DM [33,35,39,[63][64][65][66][67], the unitarity limit leads in general to small neutrinos fluxes which are therefore not detectable. Bounds are available in previous studies both for decaying [68,69] and annihilating DM [70,71]. Analyses mainly devoted to the neutrino energy spectrum are able to distinguish among different DM decay channels. Moreover, different DM models are further constrained through the informations coming from gamma-ray observations. The current data (neutrinos and gamma-rays) show that hadronic final states are strongly disfavored or excluded, while leptonic ones are slightly disfavored or allowed [72]. The most favorable case is a heavy DM candidate coupled only to neutrinos.The foregoing observations have shown that gamma-rays constraints, mainly coming from observations of the Fermi-LAT experiment, have been critical in excluding or disfavoring various DM decay channels. It is therefore all the more interesting to find out whether gamma-rays experiments in different energy ranges would be able to put further constraints on the existence of decaying DM fluxes. While the lower energy range (up to few hundreds GeV) is mainly explored by Fermi LAT [73], the higher energy range (from about 100 TeV) is explored by air shower experiments [74] and has already been used in exploring constraints on annihilating or decaying Dark Matter through data by Pierre Auger [75], CASA-MIA [76] and KASCADE [77];...

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“…However, the latest 7.5 years High Energy Starting Events (HESE) have the best-fit γ = 2.89 +0. 20 −0.19 [25]. A spectral index of about 2.3 is in tension with this result.…”

Section: Introductionmentioning

confidence: 77%

Decaying dark matter at IceCube and its signature on High Energy gamma experiments

Chianese

Fiorillo

Miele

et al. 2019

J. Cosmol. Astropart. Phys.

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“…Applying this relation to the 2014 TXS 0506+056 neutrino flare and the density of BL Lacs [19] yields…”

Section: Diffuse Cosmic Neutrino Flux and Flaring Blazarsmentioning

confidence: 99%

On the Neutrino Flares from the Direction of TXS 0506+056

Halzen

Kheirandish

Weisgarber

et al. 2019

ApJL

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For the first time since the discovery of high-energy cosmic neutrinos by IceCube, a multimessenger campaign identified a distant gamma ray blazar, TXS 0506+056, as the source of a high-energy neutrino. The extraordinary brightness of the blazar despite its distance suggests that it may belong to a special class of sources that produce cosmic rays. Moreover, over the last 10 years of data, the high-energy neutrino flux from the source is dominated by a previous neutrino flare in 2014, which implies that flaring sources strongly contribute to the cosmic ray flux. We investigate the contribution of this subclass of flaring blazars to the high-energy neutrino flux and examine its connection to the very high energy cosmic ray observations. We also study the high energy gamma ray emission accompanying the neutrino flare and show that the sources must be more efficient neutrino than gamma ray emitters. This conclusion is supported by the gamma-ray observations during the 2014 neutrino flare.

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“…We use the relation between the luminosity and the local number density of neutrino sources from Ref. [31], which is derived from the observed diffuse flux with a ∝ E −2 ν neutrino spectrum, and by assuming no redshift evolution. The result is shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Another method in order to reveal sources that give dominant contribution to the measured diffuse flux, is by studying angular clustering of registered events [28][29][30] and is shown to be more efficient than the conventional point-source searches [20] for individually bright, rare source populations such as blazars [30]. References [29,31] set, for instance, stringent limits on the number density of neutrino sources, which has the advantage that a wide range of neutrino source populations is discussed without using prior theoretical models. As complementary method, one-point fluctuation analysis [32] maximises information obtained in single pixels, which helps to constrain both extragalactic and Galactic source contributions [33].…”

Section: Introductionmentioning

confidence: 99%

Angular power spectrum analysis on current and future high-energy neutrino data

Dekker

Chianese

Ando

2020

J. Phys.: Conf. Ser.

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Astrophysical neutrino events have been measured in the last couple of years, which show an isotropic distribution, and the current discussion is their astrophysical origin. We use both isotropic and anisotropic components of the diffuse neutrino data to constrain the contribution of a broad number of extra-galactic source populations to the observed neutrino sky. We simulate up-going muon neutrino events by applying statistical distributions for the flux of extragalactic sources, and by Monte Carlo method we exploit the simulation for current and future IceCube, IceCube-Gen2 and KM3NeT exposures. We aim at constraining source populations by studying their angular patterns, for which we assess the angular power spectrum. We leave the characteristic number of sources (N ) as a free parameter, which is roughly the number of neutrino sources over which the measured intensity is divided. With existing two-year IceCube data, we can already constrain very rare, bright sources with N 100. This can be improved to N 10 4 -10 5 with IceCube-Gen2 and KM3NeT with tenyear exposure, constraining the contribution of BL Lacs (N = 6 × 10 2 ). On the other hand, we can constrain weak sources with large number densities, like starburst galaxies (N = 10 7 ), if we measure an anisotropic neutrino sky with future observations.

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Detection prospects for high energy neutrino sources from the anisotropic matter distribution in the local Universe

Cited by 26 publications

References 118 publications

Decaying dark matter at IceCube and its signature on High Energy gamma experiments

Decaying dark matter at IceCube and its signature on High Energy gamma experiments

On the Neutrino Flares from the Direction of TXS 0506+056

Angular power spectrum analysis on current and future high-energy neutrino data

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