Now showing items 718-737 of 757

    • 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 object PG 1553+113 

      Connolly, M.P.; Gillanders, Gary; Moriarty, P.; Lang, Mark (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 

      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 ...
    • Vertex algebras according to Isaac Newton 

      Tuite, Michael P. (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 

      Mason, Geoffrey; Tuite, Michael P. (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 

      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; Horan, D.; Atkins, R. W.; Badran, H. M.; Blaylock, G.; Bradbury, S. M.; Buckley, J. H.; Byrum, K. L.; Celik, O.; Chow, Y. C. K.; Cogan, P.; Cui, W.; Daniel, M. K.; Perez, I. de la Calle; Dowdall, C.; Falcone, A. D.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortin, P.; Fortson, L. F.; Gillanders, G. H.; Grube, J.; Gutierrez, K. J.; Hall, J.; Hanna, D.; Holder, J.; Hughes, S. B.; Humensky, T. B.; Kenny, G. E.; Kertzman, M.; Kieda, D. B.; Kildea, J.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Maier, G.; Moriarty, P.; Nagai, T.; Ong, R. A.; Perkins, J. S.; Petry, D.; Quinn, J.; Quinn, M.; Ragan, K.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Steele, D.; Swordy, S. P.; Toner, J. A.; Valcarcel, L.; Vassiliev, V. V.; Wagner, R. G.; Wakely, S. P.; Weekes, T. C.; White, R. J.; Williams, D. A. (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 ...
    • 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 ...
    • The Vibrio parahaemolyticus ToxRS Regulator Is Required for Stress Tolerance and Colonization in a Novel Orogastric Streptomycin-Induced Adult Murine Model 

      Boyd, Aoife (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 

      Matlawska-Wasowska, Ksenia; Finn, Rebecca; Mustel, Ana; O'Byrne, Conor P.; Boyd, Aoife (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 

      Tuite, Michael P. (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 

      Hurley, Donny; Tuite, Michael P. (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 

      Boyd, Aoife (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 ...