ZEU-EXP/AT

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2017-06-06
14:10
OpenAccess [PUBDB-2017-04338] Dissertation / PhD Thesis
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Measurement ofthe Iron Spectrum in Cosmic Rayswith the VERITAS Experiment
191 p. (2017) [10.3204/PUBDB-2017-04338] = Humboldt-Universität zu Berlin, Diss., 2017  GO
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2017-05-22
16:00
arXiv [PUBDB-2017-03387] Report/Journal Article
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The Fermi Galactic Center GeV Excess and Implications for Dark Matter
[arXiv:1704.03910] ddc:520
The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. We study the GeV excess using 6.5 yr of data from the Fermi Large Area Telescope [...]
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2017-05-09
13:43
OpenAccess [PUBDB-2017-02494] Preprint/Report
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Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
[arXiv:1704.07195] ddc:530
We present a measurement of the cosmic-ray electron+positron spectrum between 7 GeV and 2 TeV performed with almost seven years of data collected with the Fermi Large Area Telescope. We find that the spectrum is well fit by a broken power law with a break energy at about 50 GeV. [...]
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2017-05-09
13:25
OpenAccess [PUBDB-2017-02490] Report/Journal Article
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Dark matter constraints from a joint analysis of dwarf Spheroidal galaxy observations with VERITAS
[arXiv:1703.04937] ddc:530
We present constraints on the annihilation cross section of weakly interacting massive particles dark matter based on the joint statistical analysis of four dwarf galaxies with VERITAS. These results are derived from an optimized photon weighting statistical technique that improves on standard imaging atmospheric Cherenkov telescope (IACT) analyses by utilizing the spectral and spatial properties of individual photon events [...]
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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
; ; ; et al
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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