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Displaying Results 51 - 75 of 81 on page 3 of 4

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Search for a correlation between very-high-energy gamma rays and giant radio pulses in the crab pulsar (2018)

Aliu, E.; Archambault, S.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; ...

Search for a correlation between very-high-energy gamma rays and giant radio pulses in the crab pulsar (2018)

Aliu, E.; Archambault, S.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; Buckley, J. H.; Bugaev, V.; Byrum, K.; Cesarini, A.; Ciupik, L.; Collins-Hughes, E.; Connolly, M. P.; Cui, W.; Dickherber, R.; Duke, C.; Dumm, J.; Falcone, A.; Federici, S.

Abstract:

We present the results of a joint observational campaign between the Green Bank radio telescope and the VERITAS gamma-ray telescope, which searched for a correlation between the emission of very-high-energy (VHE) gamma rays (E-gamma &gt; 150 GeV) and giant radio pulses (GRPs) from the Crab pulsar at 8.9 GHz. A total of 15,366 GRPs were recorded during 11.6 hr of simultaneous observations, which were made across four nights in 2008 December and in 2009 November and December. We searched for an enhancement of the pulsed gamma-ray emission within time windows placed around the arrival time of the GRP events. In total, eight different time windows with durations ranging from 0.033 ms to 72 s were positioned at three different locations relative to the GRP to search for enhanced gamma-ray emission which lagged, led, or was concurrent with, the GRP event. Furthermore, we performed separate searches on main pulse GRPs and interpulse GRPs and on the most energetic GRPs in our data s...

http://hdl.handle.net/10379/10205

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Search for magnetically broadened cascade emission from blazars with veritas (2018)

Archambault, S.; Archer, A.; Benbow, W.; Buchovecky, M.; Bugaev, V.; Cerruti, M.; Conno...

Search for magnetically broadened cascade emission from blazars with veritas (2018)

Archambault, S.; Archer, A.; Benbow, W.; Buchovecky, M.; Bugaev, V.; Cerruti, M.; Connolly, M. P.; Cui, W.; Falcone, A.; Alonso, M. Fernández; Finley, J. P.; Fleischhack, H.; Fortson, L.; Furniss, A.; Griffin, S.; Hütten, M.; Hervet, O.; Holder, J.; Humensky, T. B.; Johnson, C. A.

Abstract:

We present a search for magnetically broadened gamma-ray emission around active galactic nuclei (AGNs), using VERITAS observations of seven hard-spectrum blazars. A cascade process occurs when multi-TeV gamma-rays from an AGN interact with extragalactic background light (EBL) photons to produce electron-positron pairs, which then interact with cosmic microwave background photons via inverse-Compton scattering to produce gamma-rays. Due to the deflection of the electron- positron pairs, a non-zero intergalactic magnetic field (IGMF) would potentially produce detectable effects on the angular distribution of the cascade emission. In particular, an angular broadening compared to the unscattered emission could occur. Through non-detection of angularly broadened emission from 1ES 1218 vertical bar 304, the source with the largest predicted cascade fraction, we exclude a range of IGMF strengths around 10(-14) G at the 95% confidence level. The extent of the exclusion range varies with the...

http://hdl.handle.net/10379/10283

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Simultaneous multiwavelength observations of markarian 421 during outburst (2018)

Acciari, V. A.; Aliu, E.; Aune, T.; Beilicke, M.; Benbow, W.; Böttcher, M.; Bradbury, S...

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Spatially resolving the very high energy emission from mgro j2019+37 with veritas (2018)

Aliu, E.; Aune, T.; Behera, B.; Beilicke, M.; Benbow, W.; Berger, K.; Bird, R.; Bouvier...

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Spectral energy distribution of markarian 501: quiescent state versus extreme outburst (2018)

Acciari, V. A.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Böttcher, M.; Boltuch, D...

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Test of models of the cosmic infrared background with multiwavelength observations of the blazar 1es 1218+30.4 in 2009 (2018)

Archambault, S.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bird, R.; Böttcher, M.;...

Test of models of the cosmic infrared background with multiwavelength observations of the blazar 1es 1218+30.4 in 2009 (2018)

Archambault, S.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bird, R.; Böttcher, M.; Bouvier, A.; Buckley, J. H.; Bugaev, V.; Ciupik, L.; Collins-Hughes, E.; Connolly, M. P.; Cui, W.; Dickherber, R.; Dumm, J.; Errando, M.; Falcone, A.; Federici, S.; Feng, Q.

Abstract:

We present the results of a multi-wavelength campaign targeting the blazar 1ES 1218+30.4 with observations with the 1.3 m McGraw-Hill optical telescope, the Rossi X-ray Timing Explorer (RXTE), the Fermi Gamma-Ray Space Telescope, and the Very Energetic Radiation Imaging Telescope Array System (VERITAS). The RXTE and VERITAS observations were spread over a 13 day period and revealed clear evidence for flux variability, and a strong X-ray and gamma-ray flare on 2009 February 26 (MJD 54888). The campaign delivered a well-sampled broadband energy spectrum with simultaneous RXTE and VERITAS very high energy (VHE, &gt; 100 GeV) observations, as well as contemporaneous optical and Fermi observations. The 1ES 1218+30.4 broadband energy spectrum-the first with simultaneous X-ray and VHE gamma-ray energy spectra-is of particular interest as the source is located at a high cosmological redshift for a VHE source (z = 0.182), leading to strong absorption of VHE gamma rays by photons from...

http://hdl.handle.net/10379/10285

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Tev and multi-wavelength observations of mrk 421 in 2006-2008 (2018)

Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Boltuch, D.; B...

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Tev gamma-ray observations of the galactic center ridge by veritas (2018)

Archer, A.; Benbow, W.; Bird, R.; Buchovecky, M.; Buckley, J. H.; Bugaev, V.; Byrum, K....

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The discovery of γ-ray emission from the blazar rgb j0710+591 (2018)

Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Bautista, M.; Beilicke, M.; Benbow, W.; ...

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The most powerful flaring activity from the nlsy1 pmn j0948+0022 (2018)

D'Ammando, F.; Orienti, M.; Finke, J.; Raiteri, C. M.; Hovatta, T.; Larsson, J.; M...

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Upper limits from five years of blazar observations with the veritas cherenkov telescopes (2018)

Archambault, S.; Archer, A.; Benbow, W.; Bird, R.; Biteau, J.; Buchovecky, M.; Buckley,...

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Veritas 2008-2009 monitoring of the variable gamma-ray source m 87 (2018)

Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Boltuch, D.; B...

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Veritas and multiwavelength observations of the bl lacertae object 1es 1741+196 (2018)

Abeysekara, A. U.; Archambault, S.; Archer, A.; Benbow, W.; Bird, R.; Biteau, J.; Bucho...

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Veritas deep observations of the dwarf spheroidal galaxy segue 1 (2018)

Aliu, E.; Archambault, S.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; ...

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Veritas discovery of &gt;200 gev gamma-ray emission from the intermediate-frequency-peaked bl lacertae object w comae (2018)

Acciari, V. A.; Aliu, E.; Beilicke, M.; Benbow, W.; Böttcher, M.; Bradbury, S. M.; Buck...

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Veritas observations of a very high energy γ-ray flare from the blazar 3c 66a (2018)

Acciari, V. A.; Aliu, E.; Arlen, T.; Beilicke, M.; Benbow, W.; Böttcher, M.; Bradbury, ...

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Veritas observations of day-scale flaring of m 87 in 2010 april (2018)

Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; Bradbury, S. M.; ...

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Veritas observations of gamma-ray bursts detected byswift (2018)

Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bradbury, S. M...

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Veritas observations of the bl lac object 1es 1218+304 (2018)

Acciari, V. A.; Aliu, E.; Arlen, T.; Beilicke, M.; Benbow, W.; Bradbury, S. M.; Buckley...

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Veritas observations of the bl lac object pg 1553+113 (2018)

Aliu, E.; Archer, A.; Aune, T.; Barnacka, A.; Behera, B.; Beilicke, M.; Benbow, W.; Ber...

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Veritas observations of the microquasar cygnus x-3 (2018)

Archambault, S.; Beilicke, M.; Benbow, W.; Berger, K.; Bird, R.; Bouvier, A.; Buckley, ...

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Veritas observations of the nova in v407 cygni (2018)

Aliu, E.; Archambault, S.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; ...

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Veritas observations of the tev binary ls i +61° 303 during 2008-2010 (2018)

Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bradbury, S. M...

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Veritas observations of the unusual extragalactic transient swift j164449.3+573451 (2018)

Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Böttcher, M.; Bouvier, A.; Bra...

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Veritas observations of the γ‐ray binary ls i +61 303 (2018)

Acciari, V. A.; Beilicke, M.; Blaylock, G.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V....

Displaying Results 51 - 75 of 81 on page 3 of 4

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