ZEU-EXP/AT

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2018-11-19
16:45
OpenAccess [PUBDB-2018-04635] Report/Journal Article
; ; ; et al
Periastron Observations of TeV Gamma-Ray Emission from a Binary System with a 50-year Period
[arXiv:1810.05271]
We report on observations of the pulsar/Be star binary system PSR J2032+4127/MT91 213 in the energy range between $100\,\mathrm{GeV}$ and $20\,\mathrm{TeV}$ with the Very Energetic Radiation Imaging Telescope Array and Major Atmospheric Gamma Imaging Cherenkov telescope arrays. The binary orbit has a period of approximately 50 years, with the most recent periastron occurring on 2017 November 13. [...]
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2018-11-19
16:29
OpenAccess [PUBDB-2018-04633] Preprint/Report
; ; ; et al
The broad-band properties of the intermediate synchrotron peaked BL Lac S2 0109+22 from radio to VHE gamma rays
[arXiv:1807.02095]
 GO
The MAGIC telescopes observed S2 0109+22 in 2015 July during its flaring activity in high energy gamma rays observed by Fermi-LAT. We analyse the MAGIC data to characterise the very high energy (VHE) gamma-ray emission of S2 0109+22, which belongs to the subclass of intermediate synchrotron peak (ISP) BL Lac objects. [...]
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2018-10-29
11:01
OpenAccess [PUBDB-2018-03989] Report/Journal Article
; ; ; et al
VERITAS and Fermi -LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog
[arXiv:1808.10423]
The High Altitude Water Cherenkov (HAWC) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100 GeV) gamma-ray sources based on 507 days of observation. Among these, 19 sources are not associated with previously known teraelectronvolt (TeV) gamma-ray sources. [...]
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2018-10-29
10:51
arXiv [PUBDB-2018-03988] Report/Journal Article
; ; ; et al
Science with e-ASTROGAM: A space mission for MeV–GeV gamma-ray astrophysics
[arXiv:1711.01265]
e-ASTROGAM (‘enhanced ASTROGAM’) is a breakthrough Observatory space mission, with a detector composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal Universe in the photon energy range from 0.3 MeV to 3 GeV – the lower energy limit can be pushed to energies as low as 150 keV for the tracker, and to 30 keV for calorimetric detection. The mission is based on an advanced space-proven detector technology, with unprecedented sensitivity, angular and energy resolution, combined with polarimetric capability [...]
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2018-10-08
10:57
OpenAccess [PUBDB-2018-03719] Journal Article
; ; ; et al
Measurement of cosmic-ray electrons at TeV energies by VERITAS
Cosmic-ray electrons and positrons (CREs) at GeV-TeV energies are a unique probe of our local Galactic neighborhood. CREs lose energy rapidly via synchrotron radiation and inverse-Compton scattering processes while propagating within the Galaxy, and these losses limit their propagation distance [...]
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2018-10-08
10:49
[PUBDB-2018-03718] Journal Article
; ; ; et al
DES science portal: Computing photometric redshifts
A significant challenge facing photometric surveys for cosmological purposes is the need to produce reliable redshift estimates. The estimation of photometric redshifts (photo-s) has been consolidated as the standard strategy to bypass the high production costs and incompleteness of spectroscopic redshift samples. [...]
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2018-10-08
10:30
arXiv [PUBDB-2018-03717] Report/Journal Article
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Detection of the blazar S4 0954+65 at very-high-energy with the MAGIC telescopes during an exceptionally high optical state
[arXiv:1801.04138]
ims.The very high energy (VHE&100GeV)γ-ray MAGIC observations of the blazar S4 0954+65, were triggered by anexceptionally high flux state of emission in the optical. This blazar has a disputed redshift ofz= 0.368 orz>0.45 and an uncertainclassification among blazar subclasses. [...]
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2018-10-08
10:19
[PUBDB-2018-03716] Journal Article
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Constraining very-high-energy and optical emission from FRB 121102 with the MAGIC telescopes
Fast radio bursts (FRBs) are bright flashes observed typically at GHz frequencies with millisecond duration, whose origin is likely extragalactic. Their nature remains mysterious, motivating searches for counterparts at other wavelengths. [...]
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2018-09-11
11:24
[PUBDB-2018-03435] Journal Article
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Constraining dark matter lifetime with a deep gamma-ray survey of the Perseus galaxy cluster with MAGIC
Clusters of galaxies are the largest known gravitationally bound structures in the Universe, with masses around $10^{15}M_{\odot}$, most of it in the form of dark matter. The ground-based Imaging Atmospheric Cherenkov Telescope MAGIC made a deep survey of the Perseus cluster of galaxies using almost 400 h of data recorded between 2009 and 2017 [...]
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2018-08-27
16:44
OpenAccess [PUBDB-2018-03205] Journal Article
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Investigating the Nature of Late-time High-energy GRB Emission through Joint Fermi / Swift Observations
We use joint observations by the Swift X-ray Telescope (XRT) and the Fermi Large Area Telescope (LAT) of gamma-ray burst (GRB) afterglows to investigate the nature of the long-lived high-energy emission observed by Fermi LAT. Joint broadband spectral modeling of XRT and LAT data reveals that LAT nondetections of bright X-ray afterglows are consistent with a cooling break in the inferred electron synchrotron spectrum below the LAT and/or XRT energy ranges [...]
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