Cherenkov light in electron-induced air showers

Sahakian, V.; Aharonian, F.; Akhperjanian, A. G.

doi:10.1016/j.astropartphys.2006.02.003

Cited by 538 publications

(975 citation statements)

References 4 publications

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“…NPM1G+01.0067 at z = 0.08 was previously detected in the VHE band by HESS (Aharonian et al 2008). The Fermi spectrum of the source, shown in Fig.…”

Section: Sources From the Bl Lac Catalogmentioning

confidence: 99%

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

Neronov¹,

Semikoz²,

Vovk³

2011

A&A

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Aims. We present a catalog of sources of very high energy (E > 100 GeV) γ-rays detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope at Galactic latitudes |b| ≥ 10 • . Methods. We cross-correlate the directions of individual photons with energies above 100 GeV detected by Fermi /LAT with the first year Fermi catalog of sources detected at lower energies. We find a significant correlation between the arrival directions of the highest energy photons and positions of Fermi sources, with the possibility of chance coincidences at the level of 10 −45 . We present a list of Fermi sources contributing to the correlation signal. A similar analysis is performed to cross-correlate the catalog of BL Lac objects with the highest energy photons detected by Fermi. Results. We produce a catalog of high Galactic latitude Fermi sources visible at 100−300 GeV energies. The catalog is divided into two parts. The first part contains a list of 50 higher significance sources among which there can be three possible false detections. The second part of the catalog contains a list of 25 lower significance sources, among which six are possibly false detections. Finally we identify eight additional sources from the cross-correlation analysis with the BL Lac catalog. The reported sources of E > 100 GeV γ-rays span a broad range of redshifts, up to z ∼ 1. Most of the sources are BL Lac type objects. Only 17 out of 83 objects in our list were previously reported as VHE γ-ray sources.

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“…NPM1G+01.0067 at z = 0.08 was previously detected in the VHE band by HESS (Aharonian et al 2008). The Fermi spectrum of the source, shown in Fig.…”

Section: Sources From the Bl Lac Catalogmentioning

confidence: 99%

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

Neronov¹,

Semikoz²,

Vovk³

2011

A&A

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“…Stecker et al 1992). In this context, the spectra of Markarian (Mkn) 501 during an extraordinary flare (Aharonian et al 1999) and of the distant blazar H 1426+482 (Aharonian et al 2003a) resulted in the first constraints of the EBL density from mid to far infrared (MIR and FIR) wavelengths. With the new generation of IACTs, limits were derived from the spectra of 1ES 1101-232 and H 2356-309 (Aharonian et al 2006) and 1ES 0229+200 (Aharonian et al 2007a) in the near infrared (NIR), and in the optical from the MAGIC observation of 3C 279 (Albert et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Limits on the extragalactic background light in theFermiera

Meyer

Raue

Mazin

et al. 2012

A&A

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Very high energy (VHE, energy E < ∼ 100 GeV) γ-rays from cosmological sources are attenuated due to the interaction with photons of the extragalactic background light (EBL) in the ultraviolet to infrared wavelength band. The EBL, thus, leaves an imprint on the observed energy spectra of these objects. In the last four years, the number of extragalactic VHE sources discovered with imaging atmospheric Cherenkov telescopes (IACTs), such as MAGIC, H.E.S.S., and VERITAS, has doubled. Furthermore, the measurements of the Fermi satellite brought new insights into the intrinsic spectra of the sources at GeV energies. In this paper, upper limits on the EBL intensity are derived by considering the most extensive VHE source sample ever used in this context. This is accomplished by constructing a large number of generic EBL shapes and combining spectral informations from Fermi and IACTs together with minimal assumptions about the source physics at high and very high γ-ray energies. The evolution of the EBL with redshift is accounted for and the possibility of the formation of an electromagnetic cascade and the implications on the upper limits are explored. The EBL density at z = 0 is constrained over a broad wavelength range between 0.4 and 100 μm. At optical wavelengths, the EBL density is constrained below 24 nW m −2 sr −1 and below 5 nW m −2 sr −1 between 8 μm and 31 μm.

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“…If DM particles annihilate or decay into SM particles, the signature of the final products of such processes may be detected up to some uncertainty in the astrophysical background component. In order to set constraints on the diverse DM models and get a better understanding of the astrophysical factor associated with the distribution of this kind of matter, numerous signals detected in gamma-rays, neutrinos, positrons, antiprotons and other particles have been studied in the available literature [10][11][12][13][14][15][16][17][18]. Most of these analysis make use of Monte Carlo event generator packages, that allow to predict the spectra of final-state particles generated by DM annihilation and decays into SM particles.…”

Section: Introductionmentioning

confidence: 99%

Reliability of Monte Carlo event generators for gamma-ray dark matter searches

Cembranos

Cruz-Dombriz

Gammaldi

et al. 2013

J. High Energ. Phys.

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Abstract:We study the differences in the gamma-ray spectra simulated by four Monte Carlo event generator packages developed in particle physics. Two different versions of PYTHIA and two of HERWIG are analyzed, namely PYTHIA 6.418 and HERWIG 6.5.10 in Fortran and PYTHIA 8.165 and HERWIG 2.6.1 in C++. For all the studied channels, the intrinsic differences between them are shown to be significative and may play an important role in misunderstanding dark matter signals.

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Cherenkov light in electron-induced air showers

Cited by 538 publications

References 4 publications

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

Limits on the extragalactic background light in theFermiera

Reliability of Monte Carlo event generators for gamma-ray dark matter searches

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