Browsing School of Physics by Author "Gillanders, Gary"
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The 2009 multiwavelength campaign on Mrk 421: variability and correlation studies
Gillanders, Gary; Lang, Mark; Gillanders, Gary; Lang, Mark; Moriarty, P. (EDP Sciences, 2015-04-17)Aims. We perform an extensive characterization of the broadband emission of Mrk 421, as well as its temporal evolution, during the non-flaring (low) state. The high brightness and nearby location (z = 0.031) of Mrk 421 ... -
A connection between star formation activity and cosmic rays in the starburst galaxy M 82
Lang, Mark; Gillanders, Gary (2009)Although Galactic cosmic rays (protons and nuclei) are widely believed to be dominantly accelerated by the winds and supernovae of massive stars, definitive evidence of this origin remains elusive nearly a century after ... -
Cutoff in the TeV Energy Spectrum of Markarian 421 During Strong Flares in 2001
Lang, Mark; Gillanders, Gary (2001)Exceptionally strong and long lasting flaring activity of the blazar Markarian 421 (Mrk 421) occurred between January and March 2001. Based on the excellent signal-to-noise ratio of the data we derive the energy spectrum ... -
Detection of Extended VHE Gamma Ray Emission from G106.3+2.7 with VERITAS
Lang, Mark; Gillanders, Gary (2009)We report the detection of very-high-energy (VHE) gamma-ray emission from supernova remnant (SNR) G106.3+2.7. Observations performed in 2008 with the VERITAS atmospheric Cherenkov gamma-ray telescope resolve extended ... -
Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar
Lang, Mark; Gillanders, Gary (2011)We report the detection of pulsed gamma rays from the Crab pulsar at energies above 100 Gigaelectronvolts (GeV) with the VERITAS array of atmospheric Cherenkov telescopes. The detection cannot be explained on the basis of ... -
The Discovery of gamma-Ray Emission From The Blazar RGB J0710+591
Lang, Mark; Gillanders, Gary (2010)The high-frequency-peaked BL Lacertae object RGB J0710+591 was observed in the very high-energy (VHE; E > 100 GeV) wave band by the VERITAS array of atmospheric Cherenkov telescopes. The observations, taken between 2008 ... -
Discovery of Spectral Variability of Markarian 421 at TeV Energies
Lang, Mark; Gillanders, Gary (2002)The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10m gamma-ray telescope taken in 2000/2001 revealed exceptionally strong and ... -
Discovery of TeV Gamma Ray Emission from Tycho's Supernova Remnant
Lang, Mark; Gillanders, Gary (2011)We report the discovery of TeV gamma-ray emission from the Type Ia supernova remnant (SNR) G120.1+1.4, known as Tycho's supernova remnant. Observations performed in the period 2008-2010 with the VERITAS ground-based gamma-ray ... -
Discovery of Variability in the Very High Energy Gamma-Ray Emission of 1ES 1218+304 with VERITAS
Lang, Mark; Gillanders, Gary (2010)We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level ... -
Discovery of Very High-Energy Gamma-Ray Radiation from the BL Lac 1ES 0806+524
Lang, Mark; Gillanders, Gary (2008)The high-frequency-peaked BL-Lacertae object \objectname{1ES 0806+524}, at redshift z=0.138, was observed in the very-high-energy (VHE) gamma-ray regime by VERITAS between November 2006 and April 2008. These data encompass ... -
Discovery of VHE $\gamma$-ray emission from the SNR G54.1+0.3
Lang, Mark; Gillanders, Gary (2010)We report the discovery of very high energy gamma-ray emission from the direction of the SNR G54.1+0.3 using the VERITAS ground-based gamma-ray observatory. The TeV signal has an overall significance of 6.8$\sigma$ and ... -
Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057
Lang, Mark; Gillanders, Gary (2009) -
Evidence for long-term Gamma-ray and X-ray variability from the unidentified TeV source HESS J0632+057
Lang, Mark; Gillanders, Gary (2009)HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested ... -
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 ... -
The First VERITAS Telescope
Lang, Mark; Gillanders, Gary (2006)The first atmospheric Cherenkov telescope of VERITAS (the Very Energetic Radiation Imaging Telescope Array System) has been in operation since February 2005. We present here a technical description of the instrument and a ... -
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 ... -
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 ... -
Highlight Talk: Recent Results from VERITAS
Lang, Mark; Gillanders, Gary (2009)VERITAS is a state-of-the-art ground-based gamma-ray observatory that operates in the very high-energy (VHE) region of 100 GeV to 50 TeV. The observatory consists of an array of four 12m-diameter imaging atmospheric Cherenkov ... -
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 1ES 1959+650, One Year After the Strong Outburst of 2002
Lang, Mark; Gillanders, Gary (2006)In April-May 2003, the blazar 1ES 1959+650 showed an increased level of X-ray activity. This prompted a multiwavelength observation campaign with the Whipple 10 m gamma-ray telescope, the Rossi X-ray Timing Explorer, the ...