Correlated variability of Mkn 421 at X-ray and TeV wavelengths on timescales of hours
L. Maraschi, G. Fossati, F. Tavecchio, L. Chiappetti, A. Celotti, G. Ghisellini, P. Grandi, E. Pian, G. Tagliaferri, A. Treves, A. C. Breslin, J. H. Buckley, D. A. Carter-Lewis, M. Catanese, M. F. Cawley, D. J. Fegan, S. Fegan, J. Finley, J. Gaidos, T. Hall, A. M. Hillas, F. Krennrich, R. W. Lessard, C. Masterson, P. Moriarty, J. Quinn, J. Rose, F. Samuelson, T. C. Weekes, T. C. Weekes
Abstract
Mkn 421 was observed for about two days with BeppoSAX, prior to and partly overlapping the start of a 1 week continuous exposure with ASCA in April 1998, as part of a world-wide multiwavelength campaign. A pronounced, well defined, flare observed in X-rays was also observed simultaneously at TeV energies by the Whipple Observatory's 10 m gamma-ray telescope. These data provide the first evidence that the X-ray and TeV intensities are well correlated on time-scales of hours.
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