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20 April 2024

» arxiv » 1106.4594

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Multiwavelength Observations of the VHE Blazar 1ES 2344+514
V. A. Acciari ; E. Aliu ; T. Arlen ; T. Aune ; M. Beilicke ; W. Benbow ; D. Boltuch ; V. Bugaev ; A. Cannon ; L. Ciupik ; P. Cogan ; P. Colin ; R. Dickherber ; A. Falcone ; S. J. Fegan ; J. P. Finley ; P. Fortin ; L. F. Fortson ; A. Furniss ; D. Gall ; G. H. Gillanders ; J. Grube ; R. Guenette ; G. Gyuk ; D. Hanna ; J. Holder ; D. Horan ; C. M. Hui ; T. B. Humensky ; A. Imran ; P. Kaaret ; N. Karlsson ; M. Kertzman ; D. Kieda ; J. Kildea ; A. Konopelko ; H. Krawczynski ; F. Krennrich ; M. J. Lang ; S. LeBohec ; G. Maier ; P. Moriarty ; R. Mukherjee ; R. A. Ong ; A. N. Otte ; D. Pandel ; J. S. Perkins ; A. Pichel ; M. Pohl ; J. Quinn ; K. Ragan ; P. T. Reynolds ; H. J. Rose ; M. Schroedter ; G. H. Sembroski ; A. W. Smith ; D. Steele ; S. P. Swordy ; M. Theiling ; J. A. Toner ; A. Varlotta ; V. V. Vassiliev ; S. Vincent ; R. Wagner ; S. P. Wakely ; J. E. Ward ; T. C. Weekes ; A. Weinstein ; T. Weisgarber ; D. A. Williams ; S. Wissel ; M. Wood ; B. Zitzer ;
Date:	23 Jun 2011
Abstract:	Multiwavelength observations of the high-frequency-peaked blazar 1ES2344+514 were performed from 2007 October to 2008 January. The campaign represents the first contemporaneous data on the object at very high energy (VHE, E >100 GeV) {gamma}-ray, X-ray, and UV energies. Observations with VERITAS in VHE {gamma}-rays yield a strong detection of 20 {sigma} with 633 excess events in a total exposure of 18.1 hours live-time. A strong VHE {gamma}-ray flare on 2007 December 7 is measured at F(>300 GeV) = (6.76 pm 0.62) imes 10-11 ph cm-2 s-1, corresponding to 48% of the Crab Nebula flux. Excluding this flaring episode, nightly variability at lower fluxes is observed with a time-averaged mean of F(>300 GeV) = (1.06 pm 0.09) imes 10-11 ph cm-2 s-1 (7.6% of the Crab Nebula flux). The differential photon spectrum between 390 GeV and 8.3 TeV for the time-averaged observations excluding 2007 December 7 is well described by a power law with a photon index of {Gamma} = 2.78 pm 0.09stat pm 0.15syst. Over the full period of VERITAS observations contemporaneous X-ray and UV data were taken with Swift and RXTE. The measured 2-10 keV flux ranged by a factor of ~7 during the campaign. On 2007 December 8 the highest ever observed X-ray flux from 1ES 2344+514 was measured by Swift XRT at a flux of F(2-10 keV) = (6.28 pm 0.31) imes 10-11 erg cm-2 s-1. Evidence for a correlation between the X-ray flux and VHE {gamma}-ray flux on nightly time-scales is indicated with a Pearson correlation coefficient of r = 0.60 pm 0.11. Contemporaneous spectral energy distributions (SEDs) of 1ES 2344+514 are presented for two distinct flux states. A one-zone synchrotron self-Compton (SSC) model describes both SEDs using parameters consistent with previous SSC modeling of 1ES 2344+514 from non-contemporaneous observations.
Source:	arXiv, 1106.4594
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