A catalogue of quasars and active nuclei: 12th edition

Véron-Cetty, M. P.; Véron, Philippe

doi:10.1051/0004-6361:20065177

Cited by 757 publications

(628 citation statements)

References 66 publications

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“…We assume now that all AGN emit UHECR and chose from the 12th VCV catalogue [22] all AGN closer than 2.5 Mpc to M87 as sources. Within this distance there are 13 additional AGN and many of them are outside the core of the Virgo cluster in regions with low magnetic fields.…”

Section: Many Sources Per Clustermentioning

confidence: 99%

UHECR observations and lensing in the magnetic field of the Virgo cluster

Dolag

Kachelrieß

Semikoz

2009

J. Cosmol. Astropart. Phys.

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Abstract. We discuss how lensing by magnetic fields in galaxy clusters affects ultrahigh energy cosmic ray (UHECR) observations. As specific example, we use Virgo together with the cluster magnetic fields obtained earlier in a constrained simulation of structure formation including MHD processes. We find that, if M87 is the single source of UHECRs from Virgo, the emitted flux is strongly anisotropic in the most interesting energy range, (50-100) EeV, and differs from the average value by a factor five or more for a significant fraction of observers. Since magnetic lensing is energy dependent, the external energy spectrum as seen by different observers varies strongly too. These anisotropies are averaged out in the case that all active galactic nuclei in Virgo emit UHECRs. In both cases, the anisotropies of the emitted UHECR flux may introduce an important bias in the interpretation of UHECR data like, e.g., the determination of the source density n s and the source energy spectrum of UHECRs.

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Section: Many Sources Per Clustermentioning

confidence: 99%

UHECR observations and lensing in the magnetic field of the Virgo cluster

Dolag

Kachelrieß

Semikoz

2009

J. Cosmol. Astropart. Phys.

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“…Arrival directions of UHECRs under consideration are illustrated in Fig. 1 in supergalactic coordinates using Hammer-Aitoff projection, together with celestial positions of AGN from the catalog [2], with redshifts z < 0.018.…”

Section: The Yakutsk Array and Experimental Data Used In Analysismentioning

confidence: 99%

Exploring arrival directions of UHECRs with the Yakutsk array

Иванов

2009

Nuclear Physics B - Proceedings Supplements

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The data on arrival directions of ultra-high energy cosmic rays (UHECRs) detected with the Yakutsk array are analyzed. The work is induced by the recent claim of the Pierre Auger collaboration for the significant correlation found between UHECRs and positions of nearby Active Galactic Nuclei (AGN) on the celestial sphere; and no correlation the HiRes collaboration stands for. Conflicting data of four giant arrays concern possible extragalactic sources of UHECRs and appeal to the profound analysis and to the future data from the Telescope Array/Northern Auger Observatory.

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“…In the first one the sky was divided into the "on-source" and "off-source" regions. Two choices were considered for the on-source region: (i) ±30 • from the supergalactic plane and (ii) 11 • around the nearby active galactic nuclei from the VCV catalog [16]. In both cases the spectra were fitted separately for the on-and off-source regions with a broken power law, yielding the break energy E b and two power indices α 1 and α 2 before and after the break, respectively.…”

Section: Spectrum Anisotropymentioning

confidence: 99%

TA Anisotropy Summary

Tinyakov

2018

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

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We analyze the ultra-high energy cosmic ray (UHECR) events collected by the surface detector of the Telescope Array (TA) during 7 years of operation for the presence of anisotropy at small and large angular scales. To minimize the number of trials, we consider three a priori chosen energy thresholds: 10 EeV, 40 EeV and 57 EeV. The two lower-energy sets show no deviation from isotropy neither at small nor at large scales. In the high-energy set E > 57 EeV there is a localized excess, the "hot spot" of the radius ∼ 20 • in the direction R.A. = 148.4 • , Dec. = 44.5 • (equatorial coordinates), reported previously in [1] on the basis of the 5yr of TA data. We present an update of this analysis with 2 additional years of data. We also examine spectral differences between different regions of the sky and, in particular, between the hot spot region and the rest of the sky.

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A catalogue of quasars and active nuclei: 12th edition

Cited by 757 publications

References 66 publications

UHECR observations and lensing in the magnetic field of the Virgo cluster

UHECR observations and lensing in the magnetic field of the Virgo cluster

Exploring arrival directions of UHECRs with the Yakutsk array

TA Anisotropy Summary

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