Les ateliers senteurs

Archambault, Marie-France

doi:10.3917/crpsy.001.0178

Cited by 32 publications

(55 citation statements)

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“…This same correlation does not appear for randomly distributed points, SDSS quasars or lower-energy gamma-ray AGN. Moreover, the percentage of sources that fall within voids is consistent across the randomly distributed, SDSS The absorption-corrected gamma-ray peak of PKS 1424+240 from Archambault et al (2014) as corrected by the Gilmore et al (2012) model (black points) and for the τ × p lower absorption resulting from the p = 2% lower EBL density (red points). Below 300 GeV, the black and red points are indistinguishable and therefore are left as black.…”

Section: Discussionmentioning

confidence: 63%

“…PKS 1424+240 has been detected at gamma-ray opacities of τ > 4.5, with the specific value dependent on the EBL model used to estimate the opacity. When the unattenuated gamma ray emission from this distant blazar is reconstructed using current EBL models, the spectrum shows a puzzling flattening or even upturn at the highest energies (Archambault et al 2014).…”

Section: Introductionmentioning

confidence: 98%

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A correlation between hard gamma-ray sources and cosmic voids along the line of sight

Furniss

Sutter

Primack

et al. 2014

Monthly Notices of the Royal Astronomical Society

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We estimate the galaxy density along lines of sight to hard extragalactic gamma-ray sources by correlating source positions on the sky with a void catalog based on the Sloan Digital Sky Survey (SDSS). Extragalactic gamma-ray sources that are detected at very high energy (VHE; E > 100 GeV) or have been highlighted as VHE-emitting candidates in the F ermi Large Area Telescope hard source catalog (together referred to as "VHE-like" sources) are distributed along underdense lines of sight at the 2.4σ level. There is also a less suggestive correlation for the F ermi hard source population (1.7σ). A correlation between 10-500 GeV flux and underdense fraction along the line of sight for VHE-like and F ermi hard sources is found at 2.4σ and 2.6σ, calculated from the Pearson correlation coefficients of r = 0.57 and 0.47, respectively. The preference for underdense sight lines is not displayed by gamma-ray emitting galaxies within the second F ermi catalog, containing sources detected above 100 MeV, or the SDSS DR7 quasar catalog. We investigate whether this marginal correlation might be a result of lower extragalactic background light (EBL) photon density within the underdense regions and find that, even in the most extreme case of a entirely underdense sight line, the EBL photon density is only 2% less than the nominal EBL density. Translating this into gamma-ray attenuation along the line of sight for a highly attenuated source with opacity τ (E, z) ∼ 5, we estimate that the attentuation of gamma-rays decreases no more than 10%. This decrease, although non-neglible, is unable to account for the apparent hard source correlation with underdense lines of sight.

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Section: Discussionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 98%

A correlation between hard gamma-ray sources and cosmic voids along the line of sight

Furniss

Sutter

Primack

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…The bands around each limit indicate the uncertainty in the assumed solar model and velocity distribution. Also shown are limits from other experiments: Ice-Cube [39] bb (brown dashed) / W + W − (brown dot-dashed); BAKSAN [40] τ + τ − (pink solid) / bb (pink dashed) / W + W − (pink dot-dashed); PICASSO [41] (blue solid); SIMPLE [42] (green solid). The black shaded regions are the 3σ C.L.…”

Section: Indirect Wimp Searchesmentioning

confidence: 99%

Atmospheric Neutrino Oscillations at Super-Kamiokande

Wendell¹

2016

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

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Recent results from a 282 kiloton-year exposure of the Super-Kamiokande detector to atmospheric neutrinos are presented. The data when fit both by themselves and in conjunction with constraints from the T2K and reactor neutrino experiments show a weak, though insignificant, preference for the normal mass hierarchy at the level of∼ 1σ . Searches for evidence of oscillations into a sterile neutrino have resulted in limits on the parameters governing their mixing, |U µ4 | 2 < 0.041 and |U τ4 | 2 < 0.18 at 90% C.L. A similar search for an indication of Lorentz-invariance violating oscillations has yielded limits three to seven orders of magnitude more stringent than existing measurements. Additionally, analyses searching for an excess of neutrinos in the atmospheric data produced from the annihilation of dark matter particles in the galaxy and sun have placed tight limits on the cross sections governing their annihilation and scattering.

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“…The pile-up effect in the de-absorbed spectra was measured by [29] with a combined significance of 4.2 standard deviations. Also, in a recent publication by the VERITAS collaboration [30] the de-absorbed spectrum of PKS 1424+240 showed a possible pile up even if assuming the lower limit on the redshift of the source (z=0.6), which is uncertain (see Figure 4). One of the explanations of the pile-up effect, if real, is the line-of-sight interactions of high-energy cosmic rays with cosmic microwave background radiation (CMBR) and EBL.…”

Section: Pile-ups In the Energy Spectra Of Vhe Sourcesmentioning

confidence: 99%

EBL signature on VHE gamma photons

Mazin¹

2015

Proceedings of Science With the New Generation of High Energy Gamma-Ray Experiments, 10th Workshop — PoS(Scineghe2014)

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Les ateliers senteurs

Cited by 32 publications

References 0 publications

A correlation between hard gamma-ray sources and cosmic voids along the line of sight

A correlation between hard gamma-ray sources and cosmic voids along the line of sight

Atmospheric Neutrino Oscillations at Super-Kamiokande

EBL signature on VHE gamma photons

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