Now showing items 718-737 of 757

• #### 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 ...
• #### Vertex algebras according to Isaac Newton ﻿

(IOP Publishing, 2017-09-08)
We give an introduction to vertex algebras using elementary forward difference methods originally due to Isaac Newton.
• #### Vertex Operators and Modular Forms ﻿

(2009)
The leitmotif of these Notes is the idea of a vertex operator algebra (VOA) and the relationship between VOAs and elliptic functions and modular forms. This is to some extent analogous to the relationship between a finite ...
• #### 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 ...
• #### The Vibrio parahaemolyticus ToxRS Regulator Is Required for Stress Tolerance and Colonization in a Novel Orogastric Streptomycin-Induced Adult Murine Model ﻿

(American Society for Microbiology, 2012-03)
Vibrio parahaemolyticus, a marine bacterium, is the causative agent of gastroenteritis associated with the consumption of seafood. It contains a homologue of the toxRS operon that in V. cholerae is the key regulator of ...
• #### The Vibrio parahaemolyticus Type III Secretion Systems manipulate host cell MAPK for critical steps in pathogenesis ﻿

(BioMed Central, 2011)
Background:Vibrio parahaemolyticus is a food-borne pathogen causing inflammation of the gastrointestinal epithelium. Pathogenic strains of this bacterium possess two Type III Secretion Systems (TTSS) that deliver effector ...
• #### The Virasoro Algebra and Some Exceptional Lie and Finite Groups ﻿

(2006)
We describe a number of relationships between properties of the vacuum Verma module of a Virasoro algebra and the automorphism group of certain vertex operator algebras. These groups include the Deligne exceptional series ...
• #### Virasoro Correlation Functions for Vertex Operator Algebras ﻿

(2011)
We consider all genus zero and genus one correlation functions for the Virasoro vacuum descendants of a vertex operator algebra. These are described in terms of explicit generating functions that can be combinatorially ...
• #### The virulence plasmid of Yersinia, an anti-host genome ﻿

(American Society for Microbiology, 1998-12)
Invasive pathogenic bacteria have in common the capacity to overcome the defense mechanisms of their animal host and to proliferate in its tissues. They each have their own life-style and target organs and cause a variety ...