Multiwavelength Observations of the very high energy Blazar 1ES2344+514
| Autor: | L. Ciupik, E. Aliu, R. Dickherber, P. Kaaret, R. Guenette, B. Zitzer, J. E. Ward, Gernot Maier, S. P. Swordy, A. Varlotta, S. P. Wakely, D. Boltuch, A. N. Otte, D. S. Hanna, T. C. Arlen, A. Imran, Daniel Gall, Amanda Weinstein, A. Cannon, Thomas Brian Humensky, P. Cogan, M. Schroedter, Lucy Fortson, R. A. Ong, F. Krennrich, Matthew Wood, D. Pandel, Vladimir Vassiliev, Pierre Colin, S. LeBohec, J. S. Perkins, K. Ragan, M. Theiling, Henric Krawczynski, A. Konopelko, J. P. Finley, A. W. Smith, Amy Furniss, Reshmi Mukherjee, Matthias Beilicke, J. A. Toner, T. C. Weekes, Martin Pohl, G. H. Sembroski, A. D. Falcone, P. Moriarty, John Kildea, Stephanie Wissel, David Kieda, T. Weisgarber, J. Grube, Jamie Holder, P. T. Reynolds, Rick Wagner, S. Vincent, David A. Williams, C. M. Hui, Wystan Benbow, Geza Gyuk, V. Bugaev, V. A. Acciari, P. Fortin, H. J. Rose, S. J. Fegan, D. Steele, M. J. Lang, A. Pichel, T. Aune, N. Karlsson, John L. Quinn, D. Horan, M. Kertzman, G. H. Gillanders |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Photon
Ciencias Físicas bl-lacertae objects Astrophysics 01 natural sciences Spectral line law.invention Telescope purl.org/becyt/ford/1 [https] law veritas 0103 physical sciences galaxies strong flares individual Blazar 010303 astronomy & astrophysics Physics markarian 501 1ES 2344+514 010308 nuclear & particles physics spectral variability Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] gamma-ray emission Galaxy Massless particle bl lacertae objects: individual (ies 2344+514) radiation Astronomía einstein slew survey Crab Nebula 13. Climate action Space and Planetary Science correlated variability cherenkov telescopes BL Lacertae objects CIENCIAS NATURALES Y EXACTAS Flare |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET The astrophysical journal / 1 738, 169 (2011). doi:10.1088/0004-637X/738/2/169 |
| DOI: | 10.1088/0004-637X/738/2/169/meta |
| Popis: | Multiwavelength observations of the high-frequency-peaked blazar 1ES 2344+514 were performed from October 2007 to January 2008. The campaign represents the first contemporanous 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 sigmas with 633 excess events in a total exposure of 18.1 hours live-time. A strong VHE gamma-ray flare on December 7, 2007 is measured at F(>300 GeV) = (6.76 ± 0.62) × 10^-11 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 ± 0.09) × 10^-11 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 December 7, 2007 is well described by a power law with a photon index of 2.78 ± 0.09 (stat) ± 0.15 (syst). A slightly harder photon index of 2.43 ± 0.22stat ± 0.15syst is measured on the flaring night of December 7, 2007. Over the full period of VERITAS observations contemporaneous X-ray and UV data were taken with Swift and RXTE. Variability by a factor of ~7 is evident in the 2-10 keV flux between nightly observations. On December 8, 2007 the highest ever observed X-ray flux from 1ES 2344+514 was measured by Swift XRT at a flux of F(2-10 keV) = (6.58 ± 0.37) × 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 ± 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. Fil: Acciari, V. A.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos Fil: Aliu, E.. University of Delaware; Estados Unidos Fil: Arlen, T.. University of California; Estados Unidos Fil: Aune, T.. University of California; Estados Unidos Fil: Beilicke, M.. University of Washington; Estados Unidos Fil: Benbow, W.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos Fil: Boltuch, D.. University of Delaware; Estados Unidos Fil: Bugaev, V.. University of Washington; Estados Unidos Fil: Cannon, A.. University College Dublin; Irlanda Fil: Ciupik, L.. Adler Planetarium and Astronomy Museum; Estados Unidos Fil: Cogan, P.. McGill University; Canadá Fil: Colin, P.. University of Utah; Estados Unidos Fil: Dickherber, R.. University of Washington; Estados Unidos Fil: Falcone, A.. University of Pennsylvania; Estados Unidos Fil: Fegan, S. J.. University of California; Estados Unidos Fil: Finley, J. P.. Purdue University; Estados Unidos Fil: Fortin, P.. Columbia University; Estados Unidos Fil: Fortson, L. F.. Adler Planetarium and Astronomy Museum; Estados Unidos Fil: Furniss, A.. University of California; Estados Unidos Fil: Gall, D.. Purdue University; Estados Unidos Fil: Gillanders, G. H.. National University of Ireland; Irlanda Fil: Grube, J.. University College Dublin; Irlanda Fil: Guenette, R.. McGill University; Canadá Fil: Gyup, G.. Adler Planetarium and Astronomy Museum; Estados Unidos Fil: Hanna, D.. McGill University; Canadá Fil: Holder, J.. University of Delaware; Estados Unidos Fil: Horan, D.. Ecole Polytechnique; Francia Fil: Hui, C. M.. University of Utah; Estados Unidos Fil: Humensky, T. B.. University Of Chicago; Estados Unidos Fil: Pichel, Ana Carolina. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|