Search for correlations between HiRes stereo events and active galactic nuclei

Abbasi, Rasha; Abu‐Zayyad, T.; Allen, M.; Amman, J. F.; Archbold, G.; Belov, K.; Belz, J. W.; BenZvi, S.; Bergman, D. R.; Blake, S. A.; Boyer, J.; Brusova, O.; Burt, G. W.; Cannon, C.; Cao, Z.; Deng, W.; Fedorova, Y.; Findlay, J.; Finley, C.; Gray, R.; Hanlon, W.; Hoffman, C. M.; Holzscheiter, M. H.; Hughes, G.; Hüntemeyer, P.; Ivanov, D.; Jones, B. F.; Jui, C.; Kim, K.; Kirn, M.; Knapp, B.; Loh, E. C.; Maestas, M. M.; Manago, Naohiro; Mannel, E.; Marek, Lukáš; Martens, K.; Matthews, J. N.; Moore, Sheva; O’Neill, A.; Painter, C. A.; Perera, L.; Reil, K.; Riehle, R.; Roberts, M.; Rodriguez, D.; Sasaki, Nobuya; Schnetzer, S.; Scott, L. M.; Seman, M.; Sinnis, G.; Smith, J. D.; Snow, R.; Sokolsky, P.; Song, C.; Springer, R. W.; Stokes, B. T.; Stratton, S. R.; Thomas, J. R.; Thomas, S. B.; Thomson, G. B.; Tupa, D.; Wiencke, L.; Zech, A.; Zhang, X.

doi:10.1016/j.astropartphys.2008.08.004

Cited by 110 publications

(63 citation statements)

References 12 publications

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“…Correlation with the same set of AGN and with the parameters fixed at the values set by the Auger collaboration analysis has been studied by the HiRes collaboration [66] with a negative result, and by the TA collaboration [41]. The most recent update of the TA analysis is presented in Fig.…”

Section: Search For Point Sourcesmentioning

confidence: 99%

Cosmic rays from the ankle to the cutoff

Kampert

Tinyakov

2014

Comptes Rendus. Physique

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Recent advances in measuring and interpreting cosmic rays from the spectral ankle to the highest energies are briefly reviewed. The prime question at the highest energies is about the origin of the flux suppression observed at E 4 · 10 19 eV. Is this the long awaited GZK-effect or the exhaustion of sources? The key to answering this question will be provided by the largely unknown mass composition at the highest energies. The high level of isotropy observed even at the highest energies challenges models of a proton dominated composition if extragalactic magnetic fields are on the order of a few nG or less. We shall discuss the experimental and theoretical progress in the field and the prospects for the next decade. RésuméRayons cosmiques de la chevilleá la coupure Les avancées récentes concernant les mesures et l'interprétation des rayons cosmiques, de la caractristique spectrale appelé cheville jusqu'aux plus hautesénergies, sont briévement revues. Aux plus hautesénergie, la question principale concerne l'origine de la suppression du flux clairement observée au dessus de 4 × 10 19 eV. Est-ce la prédiction GZK tant attendue ? Ou bien l'épuisement des sources ? La clef qui permettra de répondreà cette question réside dans la composition des rayons cosmiques qui est aujourd'hui largement inconnue aux plus hautesénergies. L'isotropie observée dans la distribution des directions d'arrivées, même aux plus hautesénergies, défavorise les modéles oú les protons dominent la composition si les champs magnétiques extragalactiques sont au niveau de quelques nG ou moins. Nous discuterons les progrés expérimentaux et théoriques du domaine et les perspectives pour la prochaine décennie.

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Section: Search For Point Sourcesmentioning

confidence: 99%

Cosmic rays from the ankle to the cutoff

Kampert

Tinyakov

2014

Comptes Rendus. Physique

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“…Statistical studies of correlation between the arrival directions of UHECR and the astrophysical objects was done in many ways [3][4][5][11][12][13][14][15][16][17][18][19]. In this paper, first we improve the previously used methods and combine them to obtain more reliable estimates of the significance of correlation.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of the correlation between active galactic nuclei and ultra-high energy cosmic rays

Kim

2011

J. Cosmol. Astropart. Phys.

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We develop the statistical methods for comparing two sets of arrival directions of cosmic rays in which the two-dimensional distribution of arrival directions is reduced to the one-dimensional distributions so that the standard one-dimensional Kolmogorov-Smirnov test can be applied. Then we apply them to the analysis of correlation between the ultra-high energy cosmic rays (UHECR) with energies above 5.7 × 10 19 eV, observed by Pierre Auger Observatory (PAO) and Akeno Giant Air Shower Array (AGASA), and the active galactic nuclei (AGN) within the distance 100 Mpc. For statistical test, we set up the simple AGN model for UHECR sources in which a certain fraction of observed UHECR are originated from AGN within a chosen distance, assuming that all AGN have equal UHECR luminosity and smearing angle, and the remaining fraction are from the isotropic background contribution. For the PAO data, our methods exclude not only a hypothesis that the observed UHECR are simply isotropically distributed but also a hypothesis that they are completely originated from the selected AGN. But, the addition of appropriate amount of isotropic component either through the background contribution or through the large smearing effect improves the correlation greatly and makes the AGN hypothesis for UHECR sources a viable one. We also point out that restricting AGN within the distance bin of 40 − 60 Mpc happens to yield a good correlation without appreciable isotropic component and large smearing effect. For the AGASA data, we don't find any significant correlation with AGN.

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“…Based on the Greisen-Zatsepin-Kuzmin (GZK) suppression (Greisen, 1966;Zatsepin & Kuzmin, 1966); the steep suppression of the spectrum above the energies ∼ 4 × 10 19 eV caused by the interaction of UHECRs with CMB photons; we can restrict candidates for the sources; they would be located within r GZK ∼ 100 Mpc. There have been many attempts to identify the source of UHECRs using correlation tests with astrophysical objects or the matter distribution in the universe (Abbasi et al, 2008;Abreu et al, 2010;Kim & Kim, 2013;Kashti & Waxman, 2008;Takami et al, 2009); however, we have no conclusive correlation results yet.…”

Section: Introductionmentioning

confidence: 92%

Strong Influence of the Galactic Magnetic Field on the Propagation of Ultra-High Energy Cosmic Rays

Kim¹,

Kim²,

Ryu³

2015

Publications of The Korean Astronomical Society

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The galactic magnetic field (GMF) and the intergalactic magnetic field (IGMF) affect the propagation of ultra-high energy cosmic rays (UHECRs) from the source to us. Here we examine the influences of the GMF/IGFM and the dependence of their sky distribution on galactic latitude, b. We analyze the correlation between the arrival direction (AD) of UHECRs observed by the Pierre Auger Observatory and the large-scale structure of the universe in regions of sky divided by b. Specifically, we compare the AD distribution of observed UHECRs to that of mock UHECRs generated from a source model constructed with active galactic nuclei. Our source model has the smearing angle as a free parameter that reflects the deflection angle of UHECRs from the source. The results show that larger smearing angles are required for the observed distribution of UHECRs in lower galactic latitude regions. We obtain, for instance, a 1σ credible interval for smearing angle of 0• at high galactic latitudes, 60• < |b| ≤ 90• , and of 75• , at low galactic latitudes, respectively. The results show that the influence of the GMF is stronger than that of the IGMF. In addition, we can estimate the strength of GMFs by these values; if we assume that UHECRs would have heavier nuclei, the estimated strengths of GMF are consistent with the observational value of a few µG. More data from the future experiments may make UHECR astronomy possible.

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Search for correlations between HiRes stereo events and active galactic nuclei

Cited by 110 publications

References 12 publications

Cosmic rays from the ankle to the cutoff

Cosmic rays from the ankle to the cutoff

Statistical analysis of the correlation between active galactic nuclei and ultra-high energy cosmic rays

Strong Influence of the Galactic Magnetic Field on the Propagation of Ultra-High Energy Cosmic Rays

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