Now showing items 96-114 of 114

• #### Validation of the inhalable dust algorithm of the Advanced REACH Tool using a dataset from the pharmaceutical industry ﻿

(RSC, 2011-05-04)
As it is often difficult to obtain sufficient numbers of measurements to adequately characterise exposure levels, occupational exposure models may be useful tools in the exposure assessment process. This study aims to ...
• #### VERITAS 2008 - 2009 monitoring of the variable gamma-ray source M87 ﻿

(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 detection of gamma-ray flaring activity from the BL LAC object 1ES 1727+502 during bright moonlight observations ﻿

(American Astronomical Society, 2015-08-01)
During moonlit nights, observations with ground-based Cherenkov telescopes at very high energies (VHEs, E > 100 GeV) are constrained since the photomultiplier tubes (PMTs) in the telescope camera are extremely sensitive ...
• #### VERITAS Discovery of &gt;200GeV Gamma-ray Emission from the Intermediate-frequency-peaked BL Lac Object W Comae ﻿

(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 ﻿

(2009)
The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007 - 2008 in VHE (very high energy: E &gt; 100 GeV) gamma-rays with the VERITAS stereoscopic array of imaging atmospheric Cherenkov ...
• #### VERITAS observations of the BL Lac object PG 1553+113 ﻿

(American Astronomical Society, 2015-01-20)
We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560 GeV, is well described by a power law with a ...
• #### VERITAS observations of the BL Lac 1ES 1218+304 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(2011)
We report on very-high-energy ($&gt;$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 ﻿

(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 &gt; 100 GeV) part of its broadband spectrum ...
• #### VERITAS: Status and Highlights ﻿

(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 ﻿

(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 ﻿

(2007)
Gamma-ray burst (GRB) observations at very high energies (VHE, E &gt; 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 ﻿

(2007)
Gamma-ray burst (GRB) observations at very high energies (VHE, E &gt; 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 ﻿

(2007)
Gamma-ray burst (GRB) observations at very high energies (VHE, E &gt; 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) ﻿

(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 ...
• #### VLT polarimetry observations of the middle-aged pulsar PSR B0656+14 ﻿

(EDP Sciences, 2015-11-02)
Context. Optical polarisation measurements are key tests for different models of the pulsar magnetosphere. Furthermore, comparing the relative orientation of the phase-averaged linear polarisation direction and the pulsar ...
• #### Volcanic sulphate and arctic dust plumes over the North Atlantic Ocean ﻿

(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 ...