IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Very-High-Energy Outburst of Markarian 501 in May 2009
Autor/es:
ARCHAMBAULT, S.; AUNE, T.; BEILICKE, M.; BIRD, R.; BUCHOVECKY, M.; CARDENZANA, J.V.; CHEN, X.; ALIU, E.; CONNOLLY, M.P.; ARLEN, T.; EISCH, J.D.; BEHERA, B.; FENG, Q.; BERGER, K.; FORTIN, P.; BOUVIER, A.; GALANTE, N.; BUGAEV, V.; GRIFFIN, S.; CESARINI, A.; GYUK, G.; COLLINS-HUGHES, E.; HOLDER, J.; DUMM, J.; JOHNSON, C.A.; FEDERICI, S.; KELLEY-HOSKINS, N.; FLEISCHHACK, H.; KIEDA, D.; FURNISS, A.; KRENNRICH, F.; GILLANDERS, G.H.; MAIER, G.; GRUBE, J.; MEAGHER, K.; HÅKANSSON, N.; MUKHERJEE, R.; ARCHER, A.; HUMENSKY, T.B.; ONG, R.A.; BARNACKA, A.; KAR, P.; PANDEL, D.; BENBOW, W.; KHASSEN, Y.; PERKINS, J.S.; BÖTTCHER, M.; KRAWCZYNSKI, H.; POPKOW, A.; BUCKLEY, J.H.; MADHAVAN, A.S.; REYES, L.C.; CERRUTI, M.; MCCANN, A.; ROUSSELLE, J.; CIUPIK, L.; MORIARTY, P.; SEMBROSKI, G.H.; CUI, W.; O'FAOLÁIN DE BHRÓITHE, A.; SKOLE, C.; FALCONE, A.; OTTE, A.N.; TELEZHINSKY, I.; FINLEY, J.P.; PELASSA, V.; FORTSON, L.; TUCCI, J.V.; POHL, M.; GALL, D.; VASSILIEV, V.V.; RAGAN, K.; GRIFFITHS, S.T.; WEINER, O.M.; ROACHE, E.; HÜTTEN, M.;
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2016 vol. 594 p. 1 - 12
ISSN:
0004-6361
Resumen:
The very high energy (VHE; E> 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54 938-54 956), 2009, as part of an extensive multi-wavelength campaign from radio to VHE. Strong VHE γ-ray activity was detected on May 1st with Whipple and VERITAS, when the flux (E > 400 GeV) increased to 10 times the pre-flare baseline flux (3.9 × 10-11 ph cm-2 s-1), reaching five times the flux of the Crab Nebula. This coincided with a decrease in the optical polarization and a rotation of the polarization angle by 15°. This VHE flare showed a fast flux variation with an increase of a factor ∼4 in 25 min, and a falling time of ∼50 min. We present the observations of the quiescent state previous to the flare and of the high state after the flare, focusing on the flux and spectral variability from Whipple, VERITAS, Fermi-LAT, RXTE, and Swift combined with optical and radio data.