Hour-Scale Multiwavelength Variability in Markarian 421
Astrophysics
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.astro-ph/9906209,
title = {Hour-Scale Multiwavelength Variability in Markarian 421},
author = {M. Catanese and I. H. Bond and S. M. Bradbury and A. C. Breslin and J. H. Buckley and A. M. Burdett and D. A. Carter-Lewis and M. F. Cawley and S. Dunlea and M. D'Vali and D. J. Fegan and S. J. Fegan and J. P. Finley and J. A. Gaidos and T. A. Hall and A. M. Hillas and D. Horan and J. Knapp and F. Krennrich and S. Le Bohec and R. W. Lessard and C. Masterson and P. Moriarty and J. Quinn and H. J. Rose and F. W. Samuelson and G. H. Sembroski and V. V. Vassiliev and T. C. Weekes and L. Maraschi and G. Fossati and F. Tavecchio and L. Chiappetti and A. Celotti and G. Ghisellini and P. Grandi and E. Pian and G. Tagliaferri and A. Treves},
journal= {arXiv preprint arXiv:astro-ph/9906209},
year = {2007}
}
Comments
4 pages, 1 figure, to be published in the proceedings of the 26th ICRC (Salt Lake City, 1999)