Hour-Scale Multiwavelength Variability in Markarian 421

M. Catanese , I.H. Bond , S.M. Bradbury , A.C. Breslin , J.H. Buckley , A.M. Burdett , D.A. Carter-Lewis , M.F. Cawley

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S. Dunlea M. D'Vali D.J. Fegan S.J. Fegan J.P. Finley J.A. Gaidos T.A. Hall A.M. Hillas D. Horan J. Knapp F. Krennrich S. Le Bohec R.W. Lessard C. Masterson P. Moriarty J. Quinn H.J. Rose F.W. Samuelson G.H. Sembroski V.V. Vassiliev T.C. Weekes L. Maraschi G. Fossati F. Tavecchio L. Chiappetti A. Celotti G. Ghisellini P. Grandi E. Pian G. Tagliaferri A. Treves

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classification 🌌 astro-ph

keywords flaremarkariancorrelatedfirstgamma-rayhour-scaleobservedvariability

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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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Hour-Scale Multiwavelength Variability in Markarian 421

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