Now showing items 1-20 of 23

  • Circular polarization of synchrotron radiation in high magnetic fields 

    de Burca, Diarmaid; Shearer, Andrew (Oxford University Press, 2015-04-17)
    The general model for incoherent synchrotron radiation has long been known, with the first theory being published by Westfold in 1959 and continued by Westfold and Legg in 1968. When this model was first developed, it was ...
  • Exceptionally bright TEV flares from the binary LS I+61 degrees 303 

    Connolly, M.P.; Gillanders, Gary; Lang, Mark (IOP Publishing, 2016-01-20)
    The TeV binary system LS I +61 degrees 303 is known for its regular, non-thermal emission pattern that traces the orbital period of the compact object in its 26.5 day orbit around its B0 Ve star companion. The system ...
  • FirstNuSTAR observations of MRK 501 within a radio to TeV multi-instrument campaign 

    Connolly, M.P.; Gillanders, Gary; Lang, Mark (IOP Publishing, 2015-10-10)
    We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During ...
  • The Galway astronomical Stokes polarimeter: an all-Stokes optical polarimeter with ultra-high time resolution 

    Collins, Patrick; Kyne, Gillian; Lara, David; Redfern, Michael; Shearer, Andrew; Sheehan, Brendan (Springer Verlag, 2013-06-28)
    Many astronomical objects emit polarised light, which can give information both about their source mechanisms, and about (scattering) geometry in their source regions. To date (mostly) only the linearly polarised components ...
  • Gamma-rays from the quasar PKS 1441+25: story of an escape 

    Connolly, M.P.; Gillanders, Gary; Lang, Mark (2015-12-20)
    Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse radiation fields that fill the universe. The detection of significant emission above 100 ...
  • In vivo correlation mapping microscopy 

    McGrath, James; Alexandrov, Sergey; Owens, Peter; Subhash, Hrebesh; Leahy, Martin (Society of Photo-optical Instrumentation Engineers (SPIE), 2016-03)
    To facilitate regular assessment of the microcirculation in vivo, noninvasive imaging techniques such as nailfold capillaroscopy are required in clinics. Recently, a correlation mapping technique has been applied to optical ...
  • Investigation of nanoscale structural alterations of cell nucleus as an early sign of cancer 

    Alexandrov, Sergey (BioMed Central, 2014)
    Background: The cell and tissue structural properties assessed with a conventional bright-field light microscope play a key role in cancer diagnosis, but they sometimes have limited accuracy in detecting early-stage cancers ...
  • An investigation of the Eigenvalue Calibration Method (ECM) using GASP for non-imaging and imaging detectors 

    Kyne, Gillian; Lara, David; Hallinan, Gregg; Redfern, Michael; Shearer, Andrew (Springer Verlag, 2016-02)
    Polarised light from astronomical targets can yield a wealth of information about their source radiation mechanisms, and about the geometry of the scattered light regions. Optical observations, of both the linear and ...
  • Irish Machine Vision and Image Processing Conference Proceedings 2016 

    Devaney, Nicholas (Irish Pattern Recognition and Classification Society, 2016)
    [No abstract available]
  • The most powerful flaring activity from the NLSyl PMN J0948+0022 

    Moriarty, P.; Gillanders, Gary; Lang, Mark (Oxford University Press, 2015-01-21)
    We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma-rays, PMN J0948+0022 (z = 0.5846). A y -ray flare was observed by the Large ...
  • Multiwavelength observations of Mrk 501 in 2008 

    Gillanders, Gary; Lang, Mark (EDP Sciences, 2015-12-17)
    Context. Blazars are variable sources on various timescales over a broad energy range spanning from radio to very high energy (>100 GeV, hereafter VHE). Mrk 501 is one of the brightest blazars at TeV energies and has been ...
  • Multiwavelength study of quiescent states of MRK 421 with unprecedented hard x-ray coverage provided by NuSTAR in 2013 

    Connolly, M.P.; Lang, Mark (IOP Publishing, 2016)
    We present coordinated multiwavelength observations of the bright, nearby BL Lacertae object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations and ...
  • Nano-sensitive optical coherence tomography 

    Alexandrov, Sergey; Subhash, Hrebesh M.; Zam, Azhar; Leahy, Martin (Royal Society of Chemistry, 2014)
    Depth resolved label-free detection of structural changes with nanoscale sensitivity is an outstanding problem in the biological and physical sciences and has significant applications in both the fundamental research and ...
  • Novel approach for label free super-resolution imaging in far field 

    Alexandrov, Sergey; McGrath, James; Hrebesh, Subhash; Leahy, Martin (Nature Publishing Group, 2015)
    Progress in the emerging areas of science and technology, such as bio- and nano-technologies, depends on development of corresponding techniques for imaging and probing the structures with high resolution. Recently, the ...
  • Performance analysis of cone detection algorithms 

    Mariotti, Letizia; Devaney, Nicholas (Optical Society of America, 2015-04-01)
    Many algorithms have been proposed to help clinicians evaluate cone density and spacing, as these may be related to the onset of retinal diseases. However, there has been no rigorous comparison of the performance of these ...
  • A search for brief optical flashes associated with the SETI target KIC 8462852 

    Gillanders, Gary; Lang, Mark (IOP Publishing, 2016-02-18)
    The F-type star KIC. 8462852 has recently been identified as an exceptional target for search for extraterrestrial intelligence (SETI) observations. We describe an analysis methodology for optical SETI, which we have used ...
  • A search for pulsations from Geminga above 100 GeV with VERITAS 

    Connolly, M.P.; Gillanders, Gary; Moriarty, P.; Lang, Mark (American Astronomical Society, 2015-02-10)
    We present the results of 71.6 hr of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-energy gamma-ray telescope array. Data taken with VERITAS between 2007 November and 2013 February were ...
  • Search for Pulsed TeV Gamma-ray Emission from the Crab Pulsar 

    Lang, Mark; Gillanders, Gary; Lessard, R. W.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Burdett, A. M.; Carter-Lewis, D. A.; Catanese, M.; Cawley, M. F.; D'Vali, M.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Gillanders, G. H.; Hall, T.; Hillas, A. M.; Krennrich, F.; Lang, M. J.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Vassiliev, V. V.; Weekes, T. C. (1999)
    We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10 m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4 hours between 1994 ...
  • Unprecedented study of the broadband emission of Mrk 421 during flaring activity in March 2010 

    Moriarty, P.; Gillanders, Gary; Lang, Mark (EDP Sciences, 2015-05-27)
    Context. Because of its proximity, Mrk 421 is one of the best sources on which to study the nature of BL Lac objects. Its proximity allows us to characterize its broadband spectral energy distribution (SED). Aims. The ...