Explanipedia

Constraints on axionlike particles from VERITAS observations of a flaring radio galaxy in the Perseus cluster Open

A. Archer, P. Bangale, W. Benbow, J. L. Christiansen, A. J. Chromey , et al. · 2025

Axion-like particles (ALPs) are hypothetical particles that emerge in numerous theoretical extensions to the Standard Model. Their coupling to electromagnetic field implies that ALPs would mix with photons in the presence of external magne…

Status of the SST Camera for the Cherenkov Telescope Array Open

Davide Depaoli, L. A. Antonelli, T. T. H. Arnesen, J. Aschersleben, Primo Attinà , et al. · 2023

The Cherenkov Telescope Array will be the next generation ground-based gamma ray observatory in the energy range from few tens of GeV to hundreds of TeV. It will be built on two sites, one for each hemisphere, to cover the entire sky. The …

VTSCat: The VERITAS Catalog of Gamma-Ray Observations Open

A. Acharyya, C. B. Adams, A. Archer, P. Bangale, J. T. Bartkoske , et al. · 2023

VTSCat is the catalog of high-level data products from all publications of the VERITAS collaboration. The VTSCat data collection contains: high-level data like spectral flux points, light curves, spectral fits in human and machine-readable…

VTSCat: The VERITAS Catalog of Gamma-Ray Observations Open

A. Acharyya, C. B. Adams, A. Archer, P. Bangale, J. T. Bartkoske , et al. · 2023

The ground-based gamma-ray observatory Very Energetic Radiation Imaging Telescope Array System (VERITAS, https://veritas.sao.arizona.edu/ ) is sensitive to photons of astrophysical origin with energies in the range between ≈85 GeV and ≈30 …

Radio Galaxies at TeV Energies Open

C. B. Rulten · 2022

Unlike blazars, radio galaxies have jets that are misaligned relative to our line-of-sight. This misaligned geometry provides us with a unique view of both the jet and super massive black hole. To date, four radio galaxies have been detect…

The Galactic high mass X-ray binary population with Fermi-LAT Open

Max Harvey, C. B. Rulten, P. M. Chadwick · 2022

We search for γ-ray emission from 114 Galactic high-mass X-ray binaries, including four well studied catalogued sources, in 12.5 yr of Fermi-LAT data in conjunction with the 10-yr point source catalogue. Where a γ-ray excess appears to be …

V404 Cygni with Fermi-LAT Open

Max Harvey, C. B. Rulten, P. M. Chadwick · 2021

We revisit the well-studied outburst of the low-mass X-ray binary (LMXB) system V404 Cygni, and claims of γ-ray excesses observed with the Fermi-LAT instrument. Upon analysing an 11.5 yr data set with the 8-yr LAT point source catalogue an…

Low Cost Neutron and Muon Detectors for Soil Moisture Monitoring Open

Patrick Stowell, A. M. Brown, P. M. Chadwick, Sam Fargher, C. B. Rulten , et al. · 2021

Water scarcity is a significant challenge for the world’s population. With the likelihood of extreme droughts increasing each year, technologies to promote sustainable irrigation and improve resilience to water shortage are needed. Continu…

The X-Ray Binary Population with Fermi-LAT Open

Max Harvey, C. B. Rulten, P. M. Chadwick · 2021

Binary star systems represent a significant proportion of the Galactic\nstellar population, with X-ray binaries being an important subset of these for\nhigh energy astrophysics. Although hundreds of X-ray binaries are detected in\nthe Milk…

A search for γ-ray emission from a sample of local Universe low-frequency selected radio galaxies Open

Max Harvey, C. B. Rulten, P. M. Chadwick · 2020

Radio galaxies are uncommon γ-ray emitters, and only low-redshift radio galaxies are detected with the Fermi Large Area Telescope (Fermi-LAT). However, they offer potential insights into the emission mechanisms of active galaxies, particul…

VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study Open

A. Archer, W. Benbow, R. Bird, A. Brill, M. Buchovecky , et al. · 2020

The radio source 3C 264, hosted by the giant elliptical galaxy NGC 3862, was observed with VERITAS between February 2017 and May 2019. These deep observations resulted in the discovery of very-high-energy (VHE; E >100 GeV) γ-ray emission f…

The Great Markarian 421 Flare of 2010 February: Multiwavelength Variability and Correlation Studies Open

A. U. Abeysekara, W. Benbow, R. Bird, A. Brill, Robert Brose , et al. · 2020

We report on variability and correlation studies using multiwavelength observations of the blazar Mrk 421 during the month of 2010 February, when an extraordinary flare reaching a level of ∼27 Crab Units above 1 TeV was measured in very hi…

A search for Centaurus A-like features in the spectra of Fermi-LAT detected radio galaxies Open

C. B. Rulten, A. M. Brown, P. M. Chadwick · 2020

Motivated by the detection of a hardening in the γ-ray spectrum of the radio galaxy Centaurus A, we have analysed $\mathord {\sim }10$ yr of Fermi-Large Area Telescope (LAT) observations of 26 radio galaxies to search for similar spectral …

VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog Open

A. U. Abeysekara, A. Archer, W. Benbow, R. Bird, Robert Brose , et al. · 2018

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 p…

Measurement of cosmic-ray electrons at TeV energies by VERITAS Open

A. Archer, W. Benbow, R. Bird, Robert Brose, M. Buchovecky , et al. · 2018

Cosmic-ray electrons and positrons (CREs) at GeV-TeV energies are a unique\nprobe of our local Galactic neighborhood. CREs lose energy rapidly via\nsynchrotron radiation and inverse-Compton scattering processes while\npropagating within th…

Measurement of the iron spectrum in cosmic rays by VERITAS Open

A. Archer, W. Benbow, R. Bird, Robert Brose, M. Buchovecky , et al. · 2018

© 2018 American Physical Society. We present a new measurement of the energy spectrum of iron nuclei in cosmic rays from 20 TeV to 500 TeV. The measurement makes use of a template-based analysis method, which, for the first time, is applie…

VERITAS Observations of the BL Lac Object TXS 0506+056 Open

A. U. Abeysekara, A. Archer, W. Benbow, R. Bird, A. Brill , et al. · 2018

On 2017 September 22, the IceCube Neutrino Observatory reported the detection of the high-energy neutrino event IC 170922A, of potential astrophysical origin. It was soon determined that the neutrino direction was consistent with the locat…

Final characterisation and design of the Gamma-ray Cherenkov Telescope (GCT) for the Cherenkov telescope array Open

O. Le Blanc, G. Fasola, Jean-Michel Huet, R. White, Anton Dmytriiev , et al. · 2018

The Gamma-ray Cherenkov Telescope (GCT) is one of the telescopes proposed for the Small Sized Telescope (SST) section of CTA. Based on a dual-mirror Schwarzschild-Couder design, which allows for more compact telescopes and cameras than the…

A Strong Limit on the Very-high-energy Emission from GRB 150323A Open

A. U. Abeysekara, A. Archer, W. Benbow, R. Bird, Robert Brose , et al. · 2018

On 2015 March 23, the Very Energetic Radiation Imaging Telescope Array System (VERITAS) responded to a Swift -Burst Alert Telescope (BAT) detection of a gamma-ray burst, with observations beginning 270 s after the onset of BAT emission, an…

Multiwavelength Observations of the Blazar BL Lacertae: A New Fast TeV Gamma-Ray Flare Open

A. U. Abeysekara, W. Benbow, R. Bird, T. Brantseg, Robert Brose , et al. · 2018

Combined with measurements made by very-long-baseline interferometry, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only a handful of such flares have been detected to dat…

HESS J1943+213: An Extreme Blazar Shining through the Galactic Plane Open

A. Archer, W. Benbow, R. Bird, Robert Brose, M. Buchovecky , et al. · 2018

HESS J1943+213 is a very high energy (VHE; >100 GeV) γ-ray source in the direction of the Galactic plane. Studies exploring the classification of the source are converging toward its identification as an extreme synchrotron BL Lac object. …

Discovery of Very-high-energy Emission from RGB J2243+203 and Derivation of Its Redshift Upper Limit Open

A. U. Abeysekara, S. Archambault, A. Archer, W. Benbow, R. Bird , et al. · 2017

Very-high-energy (VHE; > 100 GeV) gamma-ray emission from the blazar RGB J2243+203 was discovered with the VERITAS Cherenkov telescope array, during the period between 2014 December 21 and 24. The VERITAS energy spectrum from this source c…

Very-High-Energy γ-Ray Observations of the Blazar 1ES 2344+514 with VERITAS Open

Cameron H. Allen, S. Archambault, A. Archer, W. Benbow, R. Bird , et al. · 2017

We present very-high-energy $\gamma$-ray observations of the BL Lac object 1ES 2344+514 taken by the Very Energetic Radiation Imaging Telescope Array System between 2007 and 2015. 1ES 2344+514 is detected with a statistical significance ab…

Dark matter constraints from a joint analysis of dwarf Spheroidal galaxy observations with VERITAS Open

S. Archambault, A. Archer, W. Benbow, R. Bird, Etienne Bourbeau , et al. · 2017

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 we…

Gamma-ray observations under bright moonlight with VERITAS Open

S. Archambault, A. Archer, W. Benbow, R. Bird, Etienne Bourbeau , et al. · 2017

A Luminous and Isolated Gamma-Ray Flare from the Blazar B2 1215+30 Open

A. U. Abeysekara, S. Archambault, A. Archer, W. Benbow, R. Bird , et al. · 2017

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 d…

The fluid database paradigm: a prototype Open

A. J. Weinstein, L. Fortson, T. Brantseg, C. B. Rulten, Robyn R. Lutz , et al. · 2017

The process of event-building---i.e gathering and associating data from multiple sensors or sub-detectors that arises from a common physical event---is used in many fields, including high-energy physics and gamma-ray astronomy. The problem…

The GCT camera for the Cherenkov Telescope Array Open

J. Lapington, A. Abchiche, D. Allan, J.-P. Amans, T. P. Armstrong , et al. · 2016

A SEARCH FOR VERY HIGH ENERGY GAMMA RAYS FROM THE MISSING LINK BINARY PULSAR J1023+0038 WITH VERITAS Open

E. Aliu, S. Archambault, A. Archer, W. Benbow, R. Bird , et al. · 2016

The binary millisecond radio pulsar PSR J1023+0038 exhibits many characteristics similar to the gamma-ray binary system PSR B1259–63/LS 2883, making it an ideal candidate for the study of high-energy nonthermal emission. It has been the su…

Testing a novel self-assembling data paradigm in the context of IACT data Open

A. J. Weinstein, L. Fortson, T. Brantseg, C. B. Rulten, Robyn R. Lutz , et al. · 2016

The process of gathering and associating data from multiple sensors or sub-detectors due to a common physical event (the process of event-building) is used in many fields, including high-energy physics and $γ$-ray astronomy. Fault toleranc…

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