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Browsing School of Physics (Scholarly Articles) by Title

Now showing items 16-35 of 68

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 ...
Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002

Lang, Mark; Gillanders, Gary (2006)

In April-May 2003, the blazar 1ES 1959+650 showed an increased level of X-ray activity. This prompted a multiwavelength observation campaign with the Whipple 10 m gamma-ray telescope, the Rossi X-ray Timing Explorer, the ...
Multiwavelength observations of a TeV-Flare from W Comae

Lang, Mark; Gillanders, Gary (2009)

We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy gamma-ray emission in June 2008. The very ...
Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and RXTE

Lang, Mark; Gillanders, Gary (2009)

We present results from a long-term monitoring campaign on the TeV binary LSI +61 303 with VERITAS at energies above 500 GeV, and in the 2-10 keV hard X-ray bands with RXTE and Swift, sampling nine 26.5 day orbital cycles ...
Multiwavelength Observations of Markarian 421 in 2005 - 2006

Lang, Mark; Gillanders, Gary (2009)

Since September 2005, the Whipple 10m Gamma-ray Telescope has been operated primarily as a blazar monitor. The five Northern Hemisphere blazars that have already been detected at the Whipple Observatory, Markarian 421, ...
Multiwavelength Observations of the VHE Blazar 1ES 2344+514

Lang, Mark; Gillanders, Gary (2011)

Multiwavelength observations of the high-frequency-peaked blazar 1ES2344+514 were performed from 2007 October to 2008 January. The campaign represents the first contemporaneous data on the object at very high energy (VHE, ...
Observation of Extended VHE Emission from the Supernova Remnant IC 443 with VERITAS

Lang, Mark; Gillanders, Gary (2009)

We present evidence that the very-high-energy (VHE, E > 100 GeV) gamma-ray emission coincident with the supernova remnant IC 443 is extended. IC 443 contains one of the best-studied sites of supernova remnant/molecular ...
Observation of gamma-ray emission from the galaxy M87 above 250 GeV with VERITAS

Lang, Mark; Gillanders, Gary (2008)

The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in Active Galactic Nuclei from radio waves to TeV gamma-rays. Here we report the detection ...
Observations of the shell-type SNR Cassiopeia A at TeV energies with VERITAS

Lang, Mark; Gillanders, Gary (2010)

We report on observations of very high-energy gamma rays from the shell-type supernova remnant Cassiopeia A with the VERITAS stereoscopic array of four imaging atmospheric Cherenkov telescopes in Arizona. The total exposure ...