T. P. Armstrong
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View article: gammapy/gammapy: v.0.19
gammapy/gammapy: v.0.19 Open
A Python package for gamma-ray astronomy
View article: CTA – the World’s largest ground-based gamma-ray observatory
CTA – the World’s largest ground-based gamma-ray observatory Open
Very-High Energy (VHE) gamma-ray astroparticle physics is a relatively young field, and observations
\nover the past decade have surprisingly revealed almost two hundred VHE emitters which
\nappear to act as cosmic particle accelerators. T…
View article: Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase
Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase Open
Magnetar hyperflares are the most plausible explanation for fast radio bursts (FRBs)—enigmatic powerful radio pulses with durations of several milliseconds and high brightness temperatures. The first observational evidence for this scenari…
View article: Development of an advanced SiPM camera for the Large Size Telescope of the Cherenkov Telescope Array
Development of an advanced SiPM camera for the Large Size Telescope of the Cherenkov Telescope Array Open
Silicon photomultipliers (SiPMs) have become the baseline choice for cameras of the small-sized telescopes (SSTs) of the Cherenkov Telescope Array (CTA). On the other hand, SiPMs are relatively new to the field and covering large surfaces …
View article: LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV Open
Context. Supernova remnants (SNRs) are commonly thought to be the dominant sources of Galactic cosmic rays up to the knee of the cosmic-ray spectrum at a few PeV. Imaging Atmospheric Cherenkov Telescopes have revealed young SNRs as very-hi…
View article: TeV Emission of Galactic Plane Sources with HAWC and H.E.S.S.
TeV Emission of Galactic Plane Sources with HAWC and H.E.S.S. Open
The High Altitude Water Cherenkov (HAWC) observatory and the High Energy Stereoscopic System (H.E.S.S.) are two leading instruments in the ground-based very-high-energy γ -ray domain. HAWC employs the water Cherenkov detection (WCD) techni…
View article: Deep-learning-driven event reconstruction applied to simulated data from a single Large-Sized Telescope of CTA
Deep-learning-driven event reconstruction applied to simulated data from a single Large-Sized Telescope of CTA Open
When very-high-energy gamma rays interact high in the Earth's atmosphere,\nthey produce cascades of particles that induce flashes of Cherenkov light.\nImaging Atmospheric Cherenkov Telescopes (IACTs) detect these flashes and\nconvert them …
View article: Physics Performance of the Large Size Telescope prototype of the Cherenkov Telescope Array
Physics Performance of the Large Size Telescope prototype of the Cherenkov Telescope Array Open
The Large-Sized Telescope (LST) prototype of the future Cherenkov Telescope Array (CTA) is located at the Northern site of CTA, on the Canary Island of La Palma. It is designed to provide optimal performance in the lowest part of the energ…
View article: Monte Carlo Simulations and Validation of NectarCAM, a Medium Sized Telescope Camera for CTA
Monte Carlo Simulations and Validation of NectarCAM, a Medium Sized Telescope Camera for CTA Open
The upcoming Cherenkov Telescope Array (CTA) ground-based gamma-ray observatory will open up our view of the very high energy Universe, offering an improvement in sensitivity of 5-10 times that of previous experiments. NectarCAM is one of …
View article: First follow-up of transient events with the CTA Large Size Telescope prototype
First follow-up of transient events with the CTA Large Size Telescope prototype Open
The recent detection of a very high energy (VHE) emission from Gamma-Ray Bursts (GRBs) above 100 GeV performed by the MAGIC and H.E.S.S. collaborations, has represented a significant, long-awaited result for the VHE astrophysics community.…
View article: Analysis of the Cherenkov Telescope Array first Large Size Telescope real data using convolutional neural networks
Analysis of the Cherenkov Telescope Array first Large Size Telescope real data using convolutional neural networks Open
The Cherenkov Telescope Array (CTA) is the future ground-based gamma-ray\nobservatory and will be composed of two arrays of imaging atmospheric Cherenkov\ntelescopes (IACTs) located in the Northern and Southern hemispheres\nrespectively. T…
View article: Monitoring the pointing of the Large Size Telescope prototype using star reconstruction in the Cherenkov camera
Monitoring the pointing of the Large Size Telescope prototype using star reconstruction in the Cherenkov camera Open
The first Large-Sized Telescope (LST-1) proposed for the forthcoming Cherenkov Telescope Array (CTA) has started to operate in 2019 in La Palma. The large structure of LST-1 - with a 23 m mirror dish diameter - imposes a strict control of …
View article: Status and results of the prototype LST of CTA
Status and results of the prototype LST of CTA Open
The Large-Sized Telescopes (LSTs) of Cherenkov Telescope Array (CTA)\nare designed for gamma-ray studies focusing on low energy threshold,\nhigh flux sensitivity, rapid telescope repositioning speed and a large field of view.\nOnce the CTA…
View article: Camera Calibration of the CTA-LST prototype
Camera Calibration of the CTA-LST prototype Open
The Cherenkov Telescope Array (CTA) is the next-generation gamma-ray observatory that is expected to reach one order of magnitude better sensitivity than that of current telescope arrays. The Large-Sized Telescopes (LSTs) have an essential…
View article: Development of an advanced SiPM camera for the Large Size Telescope of the Cherenkov TelescopeArray Observatory
Development of an advanced SiPM camera for the Large Size Telescope of the Cherenkov TelescopeArray Observatory Open
Silicon photomultipliers (SiPMs) have become the baseline choice for cameras of the small-sized telescopes (SSTs) of the Cherenkov Telescope Array (CTA).\nOn the other hand, SiPMs are relatively new to the field and covering large surfaces…
View article: Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow
Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow Open
An intrinsic gamma-ray burst afterglow Long gamma-ray bursts (GRBs) are emitted by relativistic jets generated during the collapse of a massive star in a distant galaxy. The GRB itself lasts only a few seconds but is followed by an aftergl…
View article: Search for dark matter annihilation in the Wolf-Lundmark-Melotte dwarf irregular galaxy with H.E.S.S.
Search for dark matter annihilation in the Wolf-Lundmark-Melotte dwarf irregular galaxy with H.E.S.S. Open
We search for an indirect signal of dark matter through very high-energy γ rays from the Wolf-Lundmark-Melotte (WLM) dwarf irregular galaxy. The pair annihilation of dark matter particles would produce Standard Model particles in the final…
View article: H.E.S.S. and MAGIC observations of a sudden cessation of a very-high-energy γ-ray flare in PKS 1510−089 in May 2016
H.E.S.S. and MAGIC observations of a sudden cessation of a very-high-energy γ-ray flare in PKS 1510−089 in May 2016 Open
The flat spectrum radio quasar (FSRQ) PKS 1510-089 is known for its complex multiwavelength behaviour and it is one of only a few FSRQs detected in very-high-energy (VHE, E>100 GeV) gamma rays. The VHE gamma -ray observations with H.E.S.S.…
View article: Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation Open
The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the …
View article: Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre Open
We provide an updated assessment of the power of the Cherenkov Telescope Array (CTA) to search for thermally produced dark matter at the TeV scale, via the associated gamma-ray signal from pair-annihilating dark matter particles in the reg…
View article: Reconstruction of truncated images for PeVatron searches \nwith the Cherenkov Telescope Array
Reconstruction of truncated images for PeVatron searches
\nwith the Cherenkov Telescope Array Open
The Cherenkov Telescope Array (CTA) will be the future groundbased gamma-ray observatory using the imaging atmospheric Cherenkov technique. One of CTA’s key science projects is the search for galactic PeVatrons, extreme
\nsources of accele…
View article: LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV Open
Context. Supernova remnants (SNRs) are commonly thought to be the dominant sources of Galactic cosmic rays up to the knee of the cosmic-ray spectrum at a few PeV. Imaging Atmospheric Cherenkov Telescopes have revealed young SNRs as very-hi…
View article: An extreme particle accelerator in the Galactic plane: HESSJ1826-130
An extreme particle accelerator in the Galactic plane: HESSJ1826-130 Open
The unidentified very-high-energy (VHE; E>0.1 TeV)γ-ray source, HESS J1826−130, was discovered with the High Energy Stereoscopic System(HESS) in the Galactic plane. The analysis of 215 h of HESS data has revealed a steadyγ-ray flux from HE…
View article: Likelihoods for the CTA sensitivity to a dark matter signal from the Galactic centre (A. Acharyya et al., [arXiv:2007.16129])
Likelihoods for the CTA sensitivity to a dark matter signal from the Galactic centre (A. Acharyya et al., [arXiv:2007.16129]) Open
We present likelihoods to estimate upper limits on DM pair-annihilation in the Galactic centre, based on the Cherenkov Telescope Array (CTA) consortium publication "Sensitivity of the Cherenkov Telescope Array to a dark matter signal from …
View article: Search for dark matter signals towards a selection of recently detected DES dwarf galaxy satellites of the Milky Way with H.E.S.S.
Search for dark matter signals towards a selection of recently detected DES dwarf galaxy satellites of the Milky Way with H.E.S.S. Open
Dwarf spheroidal galaxy satellites of the Milky Way are prime targets for indirect detection of dark matter with gamma rays due to their proximity, high dark matter content, and absence of nonthermal emission processes. Recently, the Dark …
View article: Resolving Toxic DNA repair intermediates in every E. coli replication cycle: critical roles for RecG, Uup and RadD
Resolving Toxic DNA repair intermediates in every E. coli replication cycle: critical roles for RecG, Uup and RadD Open
DNA lesions or other barriers frequently compromise replisome progress. The SF2 helicase RecG is a key enzyme in the processing of postreplication gaps or regressed forks in Escherichia coli. A deletion of the recG gene renders cells highl…
View article: Probing the Magnetic Field in the GW170817 Outflow Using H.E.S.S. Observations
Probing the Magnetic Field in the GW170817 Outflow Using H.E.S.S. Observations Open
The detection of the first electromagnetic counterpart to the binary neutron star (BNS) merger remnant GW170817 established the connection between short γ -ray bursts and BNS mergers. It also confirmed the forging of heavy elements in the …
View article: Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance
Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance Open
We report on the detection of very high energy (VHE; E > 100 GeV) γ-ray emission from the BL Lac objects KUV 00311−1938 and PKS 1440−389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or prec…