ZEU-EXP/AT

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2017-04-27
09:33
[PUBDB-2017-01945] Journal Article

The optimal on-source region size for detections with counting-type telescopes
ddc:540
Source detection in counting type experiments such as Cherenkov telescopes often involves the application of the classical Eq. (17) from the paper of Li & Ma (1983) to discrete on- and off-source regions [...]
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2017-04-10
16:48
[PUBDB-2017-01615] Journal Article
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Gamma-ray observations under bright moonlight with VERITAS
ddc:540
Imaging atmospheric Cherenkov telescopes (IACTs) are equipped with sensitive photomultiplier tube (PMT) cameras. Exposure to high levels of background illumination degrades the efficiency of and potentially destroys these photo-detectors over time, so IACTs cannot be operated in the same configuration in the presence of bright moonlight as under dark skies [...]
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2017-03-13
16:12
OpenAccess [PUBDB-2017-01367] Journal Article
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Observations of M31 and M33 with the $Fermi$ Large Area Telescope: A Galactic Center Excess in Andromeda?
ddc:520
The Fermi Large Area Telescope (LAT) has opened the way for comparative studies of cosmic rays (CRs) and high-energy objects in the Milky Way (MW) and in other, external, star-forming galaxies. Using 2 yr of observations with the Fermi LAT, Local Group galaxy M31 was detected as a marginally extended gamma-ray source, while only an upper limit has been derived for the other nearby galaxy M33 [...]
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2017-03-13
16:04
OpenAccess [PUBDB-2017-01366] Journal Article
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Gamma-Ray Blazars within the First 2 Billion Years
ddc:520
The detection of high-redshift ($z\,\gt 3$) blazars enables the study of the evolution of the most luminous relativistic jets over cosmic time. More importantly, high-redshift blazars tend to host massive black holes and can be used to constrain the space density of heavy black holes in the early universe [...]
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2017-03-13
15:57
[PUBDB-2017-01365] Report/Journal Article
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Muon counting using silicon photomultipliers in the AMIGA detector of the Pierre Auger observatory
[FERMILAB-PUB-16-656-AD-CD-TD] ddc:610
AMIGA (Auger Muons and Infill for the Ground Array) is an upgrade of the Pierre Auger Observatory designed to extend its energy range of detection and to directly measure the muon content of the cosmic ray primary particle showers. The array will be formed by an infill of surface water-Cherenkov detectors associated with buried scintillation counters employed for muon counting [...]
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2017-03-13
15:29
OpenAccess [PUBDB-2017-01364] Journal Article
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Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data
ddc:550
The Large Area Telescope on board the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. [...]
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2017-03-03
11:25
OpenAccess [PUBDB-2017-01281] Journal Article
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A Luminous and Isolated Gamma-Ray Flare from the Blazar B2 1215+30
ddc:520
B2 1215+30 is a BL-Lac-type blazar that was first detected at TeV energies by the MAGIC atmospheric Cherenkov telescopes and subsequently confirmed by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) observatory with data collected between 2009 and 2012. In 2014 February 08, VERITAS detected a large-amplitude flare from B2 1215+30 during routine monitoring observations of the blazar 1ES 1218+304, located in the same field of view. [...]
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2017-03-03
11:01
OpenAccess [PUBDB-2017-01276] Preprint/Report
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Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory
[arXiv:1612.07155]
We present a combined fit of a simple astrophysical model of UHECR sources to both the energy spectrum and mass composition data measured by the Pierre Auger Observatory. The fit has been performed for energies above $5 \cdot 10^{18}$ eV, i.e. [...]
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2017-02-21
10:17
OpenAccess [PUBDB-2017-01058] Journal Article
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Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares
ddc:520
We report on the Fermi-LAT detection of high-energy emission from the behind-the-limb (BTL) solar flares that occurred on 2013 October 11, and 2014 January 6 and September 1. The Fermi-LAT observations are associated with flares from active regions originating behind both the eastern and western limbs, as determined by STEREO. [...]
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2017-02-20
16:46
OpenAccess [PUBDB-2017-01041] Journal Article
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Search for Magnetically Broadened Cascade Emission from Blazars with VERITAS
ddc:520
We present a search for magnetically broadened gamma-ray emission around active galactic nuclei (AGNs), using VERITAS observations of seven hard-spectrum blazars. A cascade process occurs when multi-TeV gamma-rays from an AGN interact with extragalactic background light (EBL) photons to produce electron–positron pairs, which then interact with cosmic microwave background photons via inverse-Compton scattering to produce gamma-rays. [...]
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