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Browsing School of Physics (Scholarly Articles) by Title

Now showing items 8-27 of 68

Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar

Lang, Mark; Gillanders, Gary (2011)

We report the detection of pulsed gamma rays from the Crab pulsar at energies above 100 Gigaelectronvolts (GeV) with the VERITAS array of atmospheric Cherenkov telescopes. The detection cannot be explained on the basis of ...
Discovery of a faint X-ray counterpart and of a parsec-long X-ray tail for the middle-aged, gamma-ray only pulsar PSR J0357+3205

Shearer, Andrew (2011)

The Large Area Telescope (LAT) onboard the Fermi satellite opened a new era for pulsar astronomy, detecting gamma-ray pulsations from more than 60 pulsars, ~40% of which are not seen at radio wavelengths. One of the most ...
The Discovery of gamma-Ray Emission From The Blazar RGB J0710+591

Lang, Mark; Gillanders, Gary (2010)

The high-frequency-peaked BL Lacertae object RGB J0710+591 was observed in the very high-energy (VHE; E > 100 GeV) wave band by the VERITAS array of atmospheric Cherenkov telescopes. The observations, taken between 2008 ...
Discovery of Spectral Variability of Markarian 421 at TeV Energies

Lang, Mark; Gillanders, Gary (2002)

The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10m gamma-ray telescope taken in 2000/2001 revealed exceptionally strong and ...
Discovery of TeV Gamma Ray Emission from Tycho's Supernova Remnant

Lang, Mark; Gillanders, Gary (2011)

We report the discovery of TeV gamma-ray emission from the Type Ia supernova remnant (SNR) G120.1+1.4, known as Tycho's supernova remnant. Observations performed in the period 2008-2010 with the VERITAS ground-based gamma-ray ...
Discovery of Variability in the Very High Energy Gamma-Ray Emission of 1ES 1218+304 with VERITAS

Lang, Mark; Gillanders, Gary (2010)

We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level ...
Discovery of Very High-Energy Gamma-Ray Radiation from the BL Lac 1ES 0806+524

Lang, Mark; Gillanders, Gary (2008)

The high-frequency-peaked BL-Lacertae object \objectname{1ES 0806+524}, at redshift z=0.138, was observed in the very-high-energy (VHE) gamma-ray regime by VERITAS between November 2006 and April 2008. These data encompass ...
Discovery of VHE $\gamma$-ray emission from the SNR G54.1+0.3

Lang, Mark; Gillanders, Gary (2010)

We report the discovery of very high energy gamma-ray emission from the direction of the SNR G54.1+0.3 using the VERITAS ground-based gamma-ray observatory. The TeV signal has an overall significance of 6.8$\sigma$ and ...
Environmental Health Organisations against Tobacco

Byrne, Miriam (2009)
Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057

Lang, Mark; Gillanders, Gary (2009)
Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057

Lang, Mark; Gillanders, Gary (2009)

HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested ...
The First VERITAS Telescope

Lang, Mark; Gillanders, Gary (2006)

The first atmospheric Cherenkov telescope of VERITAS (the Very Energetic Radiation Imaging Telescope Array System) has been in operation since February 2005. We present here a technical description of the instrument and a ...
GASP - Galway Astronomical Stokes Polarimeter

Shearer, Andrew (2009)

The Galway Astronomical Stokes Polarimeter (GASP) is an ultra-high-speed, full Stokes, astronomical imaging polarimeter based upon a Division of Amplitude Polarimeter. It has been developed to resolve extremely rapid ...
High Time Resolution Astrophysics in the Extremely Large Telescope Era : White Paper

Shearer, Andrew (2010)

High Time Resolution Astrophysics (HTRA) concerns itself with observations on short scales normally defined as being lower than the conventional read-out time of a CCD. As such it is concerned with condensed objects such ...
A high-speed bi-polar outflow from the archetypical pulsating star Mira A

Redman, Matt P. (2009)

Optical images and high-dispersion spectra have been obtained of the ejected material surrounding the pulsating AGB star Mira A. The two streams of knots on either side of the star, found in far ultra-viollet (FUV) GALEX ...
High-time Resolution Astrophysics and Pulsars

Shearer, Andrew (2008)

The discovery of pulsars in 1968 heralded an era where the temporal characteristics of detectors had to be reassessed. Up to this point detector integration times would normally be measured in minutes rather seconds and ...
Highlight Talk: Recent Results from VERITAS

Lang, Mark; Gillanders, Gary (2009)

VERITAS is a state-of-the-art ground-based gamma-ray observatory that operates in the very high-energy (VHE) region of 100 GeV to 50 TeV. The observatory consists of an array of four 12m-diameter imaging atmospheric Cherenkov ...
Investigations of the magnetospheric plasma distribution in the vicinity of a pulsar - I Basic formulation

Shearer, Andrew (2008)

The magnetospheric plasma distribution in the vicinity of a pulsar at various inclination angles is investigated using a new relativistic, parallel 3D Particle-In-Cell (PIC) code DYMPHNA3D. DYMPHNA3D uses a superposition ...
The June 2008 flare of Markarian 421 from optical to TeV energies

Lang, Mark (2008)

We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very high energy ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 and June 23. A high energy ...
Kinematics of the Broad Line Region in M81

Shearer, Andrew (2007)

A new model is presented which explains the origin of the broad emission lines observed in the LINER/Seyfert nucleus of M81 in terms of a steady state spherically symmetric inflow, amounting to 1 x 10^-5 Msun/yr, which is ...