Hour-Scale Multiwavelength Variability in Markarian 421
Catanese, M. · Bond, I. H. · Bradbury, S. M. · Breslin, A. C. · Buckley, J. H. · Burdett, A. M. · Carter-Lewis, D. A. · Cawley, M. F. · Dunlea, S. · D'Vali, M. · Fegan, D. J. · Fegan, S. J. · Finley, J. P. · Gaidos, J. A. · Hall, T. A. · Hillas, A. M. · Horan, D. · Knapp, J. · Krennrich, F. · Bohec, S. Le · Lessard, R. W. · Masterson, C. · Moriarty, P. · Quinn, J. · Rose, H. J. · Samuelson, F. W. · Sembroski, G. H. · Vassiliev, V. V. · Weekes, T. C. · Maraschi, L. · Fossati, G. · Tavecchio, F. · Chiappetti, L. · Celotti, A. · Ghisellini, G. · Grandi, P. · Pian, E. · Tagliaferri, G. · Treves, A.
Original · EN
Markarian 421 was observed for about four days with BeppoSAX and the Whipple Observatory gamma-ray telescope in April 1998. A pronounced, well-defined, flare with hour-scale variability was observed simultaneously in X-rays and very high energy gamma-rays. These data provide the first evidence that the X-ray and TeV intensities are well correlated on time-scales of hours. While the rise of the flare occurred on a similar time-scale in the two wavebands, the decay of the flare was much more rapid in gamma rays, providing the first clear indication that the X-ray and gamma-ray emission may not be completely correlated in Markarian 421.
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