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Browsing School of Physics (Scholarly Articles) by Title

Now showing items 49-68 of 68

Simultaneous Multiwavelength Observations of Markarian 421 During Outburst

Lang, Mark (2009)

We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, ...
Status of the VERITAS Observatory

Lang, Mark; Gillanders, Gary (2008)

VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of ...
Supersonic turbulence in the cold massive core JCMT 18354-0649S

Redman, Matt P. (2009)

An example of a cold massive core, JCMT 18354-0649S, a possible high mass analogue to a low mass star forming core is studied. Line and continuum observations from JCMT, Mopra Telescope and Spitzer are presented and modelled ...
TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008

Lang, Mark; Gillanders, Gary (2011)

We report on TeV gamma-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10m Cherenkov telescope. The excellent sensitivity of VERITAS allowed us to sample the TeV ...
TeV Gamma-Ray Observations of the Perseus and Abell 2029 Galaxy Clusters

Lang, Mark; Gillanders, Gary (2006)

Galaxy clusters might be sources of TeV gamma rays emitted by high-energy protons and electrons accelerated by large scale structure formation shocks, galactic winds, or active galactic nuclei. Furthermore, gamma rays may ...
Towards an explanation for the 30 Dor (LMC) Honeycomb nebula - the impact of recent observations and spectral analysis

Meaburn, John; Redman, Matt P; Boumis, Panos; Harvey, Eamonn (2010)
VERITAS 2008 - 2009 monitoring of the variable gamma-ray source M87

Lang, Mark; Gillanders, Gary (2010)

M87 is a nearby radio galaxy that is detected at energies ranging from radio to VHE gamma-rays. Its proximity and its jet, misaligned from our line-of-sight, enable detailed morphological studies and extensive modeling at ...
VERITAS Discovery of >200GeV Gamma-ray Emission from the Intermediate-frequency-peaked BL Lac Object W Comae

Lang, Mark; Gillanders, Gary (2008)

We report the detection of very high-energy gamma-ray emission from the intermediate-frequency-peaked BL Lacertae object W Comae (z=0.102) by VERITAS. The source was observed between January and April 2008. A strong outburst ...
VERITAS Observations of a Very High Energy Gamma-ray Flare from the Blazar 3C 66A

Lang, Mark; Gillanders, Gary (2009)

The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007 - 2008 in VHE (very high energy: E > 100 GeV) gamma-rays with the VERITAS stereoscopic array of imaging atmospheric Cherenkov ...
VERITAS observations of the BL Lac 1ES 1218+304

Lang, Mark; Gillanders, Gary (2009)

The VERITAS collaboration reports the detection of very-high-energy (VHE) gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift of z=0.182. A gamma-ray signal was detected with ...
VERITAS Observations of the gamma-Ray Binary LS I +61 303

Lang, Mark; Gillanders, Gary (2008)

LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy gamma-rays. The system was observed over several orbital cycles (between September 2006 and February ...
VERITAS Observations of the TeV Binary LS I +61 303 During 2008-2010

Lang, Mark; Gillanders, Gary (2011)

We present the results of observations of the TeV binary LS I +61 303 with the VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In the past, both ground-based gamma-ray telescopes VERITAS and MAGIC ...
VERITAS Observations of the Unusual Extragalactic Transient Swift J164449.3+573451

Gillanders, Gary (2011)

We report on very-high-energy ($>$100 GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the {\it Swift} Observatory and later detected by multiple radio, optical and ...
VERITAS Upper Limit on the VHE Emission from the Radio Galaxy NGC 1275

Lang, Mark; Gillanders, Gary (2009)

The recent detection by the Fermi gamma-ray space telescope of high-energy gamma-rays from the radio galaxy NGC 1275 makes the observation of the very high energy (VHE: E > 100 GeV) part of its broadband spectrum ...
VERITAS: Status and Highlights

Lang, Mark; Gillanders, Gary (2011)

The VERITAS telescope array has been operating smoothly since 2007, and has detected gamma-ray emission above 100 GeV from 40 astrophysical sources. These include blazars, pulsar wind nebulae, supernova remnants, gamma-ray ...
A Very High Energy Gamma-Ray Spectrum of 1ES 2344+514

Lang, Mark; Gillanders, Gary (2005)

The BL Lacertae (BL Lac) object 1ES 2344+514 (1ES 2344), at a redshift of 0.044, was discovered as a source of very high energy (VHE) gamma rays by the Whipple Collaboration in 1995 \citep{2344Catanese98}. This detection ...
Very High Energy Observations of Gamma-Ray Burst Locations with the Whipple Telescope

Lang, Mark; Gillanders, Gary (2007)

Gamma-ray burst (GRB) observations at very high energies (VHE, E > 100 GeV) can impose tight constraints on some GRB emission models. Many GRB afterglow models predict a VHE component similar to that seen in blazars and ...
Very High Energy Observations of Gamma-Ray Burst Locations with the Whipple Telescope

Lang, Mark; Gillanders, Gary (2007)

Gamma-ray burst (GRB) observations at very high energies (VHE, E > 100 GeV) can impose tight constraints on some GRB emission models. Many GRB afterglow models predict a VHE component similar to that seen in blazars and ...
VLT / Infrared Integral Field Spectrometer Observations of Molecular Hydrogen Lines in the Knots in the Planetary Nebula NGC 7293 (the Helix Nebula)

Redman, Matt P. (2007)

Knots are commonly found in nearby planetary nebulae (PNe) and star forming regions. Within PNe, knots are often found to be associated with the brightest parts of the nebulae and understanding the physics involved in knots ...
Volcanic sulphate and arctic dust plumes over the North Atlantic Ocean

Ovadnevaite, Jurgita; Ceburnis, Darius; Dupuy, Regis; Berresheim, Harald; O Dowd, Colin D. (Elsevier, 2009)

High time resolution aerosol mass spectrometry measurements were conducted during a field campaign at Mace Head Research Station, Ireland, in June 2007. Observations on one particular day of the campaign clearly indicated ...